add epics and wikis features

Reviewed-on: http://localhost:3000/david/flask_react_monorepo_template/pulls/6

.env.example

@@ -17,6 +17,16 @@ GRAFANA_PASSWORD=change-this-password-in-production
 CELERY_BROKER_URL=redis://redis:6379/0
 CELERY_RESULT_BACKEND=redis://redis:6379/0
 
+# MinIO Configuration (Object Storage)
+# MinIO server stays hidden - Flask proxies all requests
+# MINIO_ENDPOINT: Internal Docker network address (for server-to-server communication)
+MINIO_ENDPOINT=minio:9000
+MINIO_ACCESS_KEY=minioadmin
+MINIO_SECRET_KEY=minioadmin
+MINIO_USE_SSL=false
+# Note: Thumbnails are served via /api/files/:id/proxy-thumbnail (no auth)
+# Full files require JWT authentication via /api/files/:id/download
+
 # Optional: External Services
 # REDIS_URL=redis://localhost:6379/0
 # SMTP_HOST=smtp.gmail.com

.gitignore

@@ -84,3 +84,5 @@ htmlcov/
 celerybeat-schedule
 
 backend/app/static
+
+.clinerules

EPIC_WIKI_IMPLEMENTATION_SUMMARY.md

@@ -0,0 +1,338 @@
+# Epic & Wiki Feature Implementation Summary
+
+## Overview
+This document summarizes the implementation of the Epic and Wiki features for the Kanban application.
+
+## What Was Implemented
+
+### Backend (Flask)
+
+#### 1. Database Models
+
+**Epic Model** (`backend/app/models/epic.py`)
+- Rich text content support (JSON for Slate.js)
+- Hierarchical structure (parent_epic_id for nesting)
+- Color coding
+- Position ordering
+- Board-level scoping
+- Soft delete support (closed field)
+- Depth limit for hierarchy control
+
+**Wiki Model** (`backend/app/models/wiki.py`)
+- Rich text content (JSON for Slate.js)
+- URL-friendly slugs
+- Summary field
+- Categories for organization
+- Tags support
+- Created by / Updated by tracking
+- Board-level scoping
+
+**Card Model Update** (`backend/app/models/card.py`)
+- Added `epic_id` foreign key to link cards to epics
+
+**Association Table** (`wiki_entity_links`)
+- Many-to-many relationship between Wikis and entity types
+- Supports linking Wikis to Cards, Epics, and future entity types
+
+#### 2. Database Migration
+- Created migration file: `6fc439155ced_add_epic_and_wiki_models.py`
+- Adds all new tables and relationships
+
+### Frontend (React/TypeScript)
+
+#### 1. TypeScript Types (`frontend/src/types/epic.ts`)
+```typescript
+- Epic interface
+- Wiki interface
+- CreateEpicRequest / UpdateEpicRequest
+- CreateWikiRequest / UpdateWikiRequest
+- WikiEntityLink interface
+```
+
+#### 2. Components
+
+**RichTextEditor** (`frontend/src/components/RichTextEditor.tsx`)
+- Slate.js-based rich text editor
+- Editable with proper styling
+- Dark mode support
+- Placeholder support
+- Read-only mode option
+
+**RichTextContent** (`frontend/src/components/RichTextContent.tsx`)
+- Read-only renderer for Slate.js content
+- Supports paragraphs, lists, blockquotes
+- Text formatting (bold, italic, underline, code)
+- Dark mode styling
+
+#### 3. Custom Hook
+
+**useEpics** (`frontend/src/hooks/useEpics.ts`)
+- Fetch all epics for a board
+- Create new epic
+- Update existing epic
+- Delete epic
+- Integrated with global loader and toast notifications
+- Error handling with user-friendly messages
+
+#### 4. API Integration
+
+Updated `useApi` hook with epic methods:
+```typescript
+- getEpics(boardId)
+- createEpic(boardId, epicData)
+- getEpic(epicId)
+- updateEpic(epicId, epicData)
+- deleteEpic(epicId)
+- addEpicToCard(cardId, epicId)
+- removeEpicFromCard(cardId, epicId)
+```
+
+## Key Design Decisions
+
+### 1. Epic Hierarchy
+- **Decision**: Self-referential foreign key (`parent_epic_id`)
+- **Rationale**: Allows flexible nesting of epics with arbitrary depth
+- **Feature**: `depth_limit` field to control maximum nesting depth
+
+### 2. Rich Text Storage
+- **Decision**: Store as JSON (compatible with Slate.js)
+- **Rationale**: 
+  - Slate.js natively uses JSON format
+  - No serialization/deserialization overhead
+  - Easy to query and modify content structure
+
+### 3. Wiki vs Document Naming
+- **Decision**: Use "Wiki" instead of "Document"
+- **Rationale**: Avoids confusion with file attachments
+- **Meaning**: Wiki implies knowledge base / documentation repository
+
+### 4. Entity Linking Strategy
+- **Decision**: Polymorphic association table (`wiki_entity_links`)
+- **Rationale**: 
+  - Single table handles all entity types
+  - Easy to add new entity types in future
+  - Avoids circular imports and complex schema changes
+
+### 5. Epic-Card Relationship
+- **Decision**: One-way reference (Card → Epic)
+- **Rationale**: 
+  - Simpler than many-to-many (epics contain cards)
+  - Cards can belong to one epic at a time
+  - Consistent with Jira's parent/child pattern
+
+## Architecture
+
+### Backend Data Flow
+
+```
+Board (1) ───────┬─────── (1) Epic
+  │               │
+  │               │─── (0..*) Card (via epic_id)
+  │
+  └───────────────┬─────── (0..*) Wiki
+                   │
+                   └─── wiki_entity_links ───┬── Card
+                                            ├── Epic
+                                            └── (future entities)
+```
+
+### Frontend Component Structure
+
+```
+BoardEpics (page)
+├── EpicList
+│   └── EpicCard
+└── CreateEpicModal
+    ├── EpicForm
+    │   ├── EpicNameInput
+    │   ├── EpicDescriptionInput
+    │   └── RichTextEditor (content)
+    └── ColorPicker
+```
+
+## Next Steps
+
+### Immediate Actions Required
+
+1. **Run Database Migration**
+   ```bash
+   cd backend
+   flask db upgrade
+   ```
+
+2. **Create Backend Routes** (`backend/app/routes/kanban/epics.py`)
+   - CRUD operations for Epics
+   - Epic-Card linking endpoints
+   - Wiki CRUD operations
+   - Wiki-Entity linking endpoints
+
+3. **Create Backend Schemas** (`backend/app/schemas/epic.py`, `wiki.py`)
+   - Marshmallow schemas for serialization
+   - Input validation
+
+4. **Update BoardEpics Page** (`frontend/src/pages/BoardEpics.tsx`)
+   - Implement epic list view
+   - Add create epic modal
+   - Add epic detail view
+   - Include RichTextEditor for epic content
+
+5. **Update Card Detail Page** (`frontend/src/pages/CardDetail.tsx`)
+   - Add epic selector dropdown
+   - Display linked epic information
+   - Add wiki links
+
+### Future Enhancements
+
+1. **Wiki Features**
+   - Wiki page with sidebar navigation
+   - Markdown export/import
+   - Wiki search functionality
+   - Version history
+
+2. **Epic Features**
+   - Epic progress tracking (cards completed vs total)
+   - Epic metrics dashboard
+   - Epic drag-and-drop reordering
+   - Epic timeline view
+
+3. **UI/UX Improvements**
+   - Epic color picker with presets
+   - Epic hierarchy tree view
+   - Inline card epic assignment
+   - Epic templates
+
+4. **Analytics**
+   - Epic completion rate
+   - Time spent on epic
+   - Epic size distribution
+   - Wiki usage statistics
+
+## Database Schema
+
+### Epic Table
+```sql
+CREATE TABLE epics (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(200) NOT NULL,
+    description TEXT,
+    content JSONB,
+    color VARCHAR(7),
+    closed BOOLEAN DEFAULT FALSE,
+    pos FLOAT,
+    depth_limit INTEGER,
+    board_id INTEGER REFERENCES boards(id),
+    parent_epic_id INTEGER REFERENCES epics(id),
+    date_last_activity TIMESTAMP,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+```
+
+### Wiki Table
+```sql
+CREATE TABLE wikis (
+    id SERIAL PRIMARY KEY,
+    name VARCHAR(200) NOT NULL,
+    slug VARCHAR(200) UNIQUE,
+    content JSONB NOT NULL,
+    summary TEXT,
+    category VARCHAR(100),
+    board_id INTEGER REFERENCES boards(id),
+    created_by INTEGER REFERENCES users(id),
+    updated_by INTEGER REFERENCES users(id),
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    updated_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
+);
+```
+
+### Wiki Entity Links Table
+```sql
+CREATE TABLE wiki_entity_links (
+    wiki_id INTEGER REFERENCES wikis(id) ON DELETE CASCADE,
+    entity_type VARCHAR(50) NOT NULL,
+    entity_id INTEGER NOT NULL,
+    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
+    linked_by INTEGER REFERENCES users(id),
+    PRIMARY KEY (wiki_id, entity_type, entity_id)
+);
+```
+
+## API Endpoints (To Be Implemented)
+
+### Epic Endpoints
+```
+GET    /api/boards/<board_id>/epics
+POST   /api/boards/<board_id>/epics
+GET    /api/epics/<epic_id>
+PUT    /api/epics/<epic_id>
+DELETE /api/epics/<epic_id>
+```
+
+### Epic-Card Linking
+```
+POST   /api/cards/<card_id>/epics
+DELETE /api/cards/<card_id>/epics/<epic_id>
+```
+
+### Wiki Endpoints
+```
+GET    /api/boards/<board_id>/wikis
+POST   /api/boards/<board_id>/wikis
+GET    /api/wikis/<wiki_id>
+PUT    /api/wikis/<wiki_id>
+DELETE /api/wikis/<wiki_id>
+GET    /api/wikis/<wiki_id>/content
+```
+
+### Wiki-Entity Linking
+```
+POST   /api/wikis/<wiki_id>/links
+DELETE /api/wikis/<wiki_id>/links/<entity_type>/<entity_id>
+```
+
+## Testing Considerations
+
+### Unit Tests
+- Epic model creation and relationships
+- Wiki model creation and relationships
+- Epic hierarchy validation
+- Wiki slug generation
+- Rich text content serialization
+
+### Integration Tests
+- Epic CRUD operations
+- Wiki CRUD operations
+- Epic-Card linking
+- Wiki-Entity linking
+- Epic hierarchy operations
+
+### Frontend Tests
+- RichTextEditor component
+- RichTextContent component
+- useEpics hook
+- Epic list rendering
+- Epic creation form
+
+## Notes
+
+- **Slate.js Content**: Content is stored as raw Slate.js JSON format, which includes element types, text nodes, and formatting information
+- **Hierarchical Epics**: While supported, UI for nesting epics is not yet implemented
+- **Wiki Slugs**: Slugs should be auto-generated from wiki names and checked for uniqueness
+- **Color Codes**: Epic colors should be valid hex codes (e.g., "#ef4444")
+- **Position**: Epic positions use float values for flexible reordering (similar to Trello)
+
+## Related Files
+
+### Backend
+- `backend/app/models/epic.py` - Epic model
+- `backend/app/models/wiki.py` - Wiki model
+- `backend/app/models/card.py` - Updated Card model
+- `backend/app/models/__init__.py` - Model imports
+- `backend/migrations/versions/6fc439155ced_add_epic_and_wiki_models.py` - Migration
+
+### Frontend
+- `frontend/src/types/epic.ts` - TypeScript interfaces
+- `frontend/src/components/RichTextEditor.tsx` - Editor component
+- `frontend/src/components/RichTextContent.tsx` - Content renderer
+- `frontend/src/hooks/useEpics.ts` - Epic custom hook
+- `frontend/src/hooks/useApi.ts` - Updated API methods

EPIC_WIKI_MODELS_SUMMARY.md

@@ -0,0 +1,238 @@
+# Epic and Wiki Models - Implementation Summary
+
+## Overview
+This document summarizes the implementation of Epic and Wiki models for the Kanban application.
+
+## What Was Implemented
+
+### 1. Epic Model (`backend/app/models/epic.py`)
+- Tracks large features across multiple cards
+- Hierarchical structure (parent-child epics)
+- Rich text content support (Slate.js JSON)
+- Color-coded badges for visual identification
+- Metrics tracking (card count)
+
+**Key Fields:**
+- `id`, `name`, `description`, `content` (JSONB)
+- `color` (hex code for epic badge)
+- `closed`, `pos`, `depth_limit` (default 5)
+- `board_id`, `parent_epic_id`
+- `date_last_activity`, `created_at`, `updated_at`
+- `metrics` (JSONB - stores card_count)
+
+**Relationships:**
+- Board: One-to-many (Board has many Epics)
+- Cards: One-to-many (Epic has many Cards)
+- Parent Epic: Self-referential (hierarchical)
+- File Attachments: Polymorphic (like Cards)
+
+### 2. Wiki Model (`backend/app/models/wiki.py`)
+- Reusable rich text content within a board
+- Board-scoped (not global across all boards)
+- Polymorphic links to entities (Card, Epic, etc.)
+- Categorization and tagging support
+
+**Key Fields:**
+- `id`, `name`, `slug` (URL-friendly)
+- `content` (JSONB - rich text)
+- `summary`, `category`, `tags` (JSONB)
+- `board_id`, `created_by`, `updated_by`
+- `created_at`, `updated_at`
+
+**Relationships:**
+- Board: One-to-many (Board has many Wikis)
+- Entities: Many-to-many polymorphic (via wiki_entity_links)
+
+### 3. Card Model Updates (`backend/app/models/card.py`)
+- Added `epic_id` foreign key (nullable)
+- Updated `to_dict()` to include `epic_id`
+- One-to-one relationship: Card belongs to one Epic
+
+### 4. Association Table (`wiki_entity_links`)
+- Polymorphic many-to-many table
+- Links wikis to any entity type
+- Fields: `wiki_id`, `entity_type`, `entity_id`, `created_at`, `linked_by`
+
+## Database Schema
+
+### New Tables
+1. **epics** - Epic records
+2. **wikis** - Wiki content records  
+3. **wiki_entity_links** - Wiki-to-entity associations
+
+### Modified Tables
+1. **cards** - Added `epic_id` foreign key
+
+### Relationships Diagram
+```
+Board (1) ----< (N) Epic
+Epic (1) ----< (N) Card  (each card belongs to one epic)
+Epic (1) ----< (N) Epic  (parent-child hierarchy)
+
+Board (1) ----< (N) Wiki
+Wiki (M) ----> (M) Entity  (polymorphic: Card, Epic)
+```
+
+## Database Migration
+
+**File:** `backend/migrations/versions/add_epic_and_wiki_models.py`
+
+**Creates:**
+- `epics` table with indexes on `board_id`, `closed`, `name`
+- `wikis` table with indexes on `board_id`, `name`, `slug`
+- `wiki_entity_links` table with composite primary key
+- `epic_id` column in `cards` table with index and foreign key
+
+**To apply migration:**
+```bash
+cd backend
+flask db upgrade
+```
+
+**To rollback:**
+```bash
+flask db downgrade
+```
+
+## Model Exports
+
+Updated `backend/app/models/__init__.py` to include:
+- `from app.models.epic import Epic`
+- `from app.models.wiki import Wiki`
+
+Added to `__all__` list: `"Epic"`, `"Wiki"`
+
+## Design Decisions
+
+### Why "Wiki" instead of "Document"?
+- Avoids confusion with file attachments
+- Emphasizes reusable knowledge content
+- Better semantic meaning for rich text resources
+
+### One-to-Many Epic-Card Relationship
+- Simpler, clearer ownership
+- Each card belongs to one epic
+- Easier to query and display
+
+### Board-Scoped Wikis
+- Wikis belong to a specific board
+- Not global across all boards
+- Better organization and access control
+
+### Epic Hierarchy Depth
+- Default depth limit: 5 levels
+- Configurable per epic
+- Backend should enforce when creating child epics
+
+### Simplified Metrics
+- Currently only tracks `card_count`
+- Stored in JSONB field: `{"card_count": 10}`
+- Easy to extend with more metrics later
+
+## Next Steps
+
+### Backend Implementation
+1. ✅ Create models - **DONE**
+2. ✅ Create database migration - **DONE**
+3. ⏭️ Create schemas for serialization
+4. ⏭️ Create API routes (CRUD operations)
+5. ⏭️ Create services for business logic
+6. ⏭️ Add validation for epic depth limit
+7. ⏭️ Update epic metrics when cards change
+8. ⏭️ Write tests for models and routes
+
+### Frontend Implementation
+1. ⏭️ Update TypeScript types
+2. ⏭️ Create Epic page/component
+3. ⏭️ Create Wiki page/component
+4. ⏭️ Add epic dropdown to card detail
+5. ⏭️ Create epic list on board detail
+6. ⏭️ Implement rich text editor (Slate.js)
+7. ⏭️ Add wiki linking UI
+
+### API Endpoints (Future)
+
+#### Epic Endpoints
+```
+GET  /api/boards/{board_id}/epics           # List all epics for board
+POST /api/boards/{board_id}/epics           # Create epic
+GET  /api/epics/{epic_id}                   # Get epic details with cards
+PUT  /api/epics/{epic_id}                   # Update epic
+DELETE /api/epics/{epic_id}                 # Delete epic
+POST /api/epics/{epic_id}/cards             # Create card directly in epic
+GET  /api/epics/{epic_id}/tree              # Get epic hierarchy tree
+```
+
+#### Wiki Endpoints
+```
+GET  /api/boards/{board_id}/wikis           # List all wikis for board
+POST /api/boards/{board_id}/wikis           # Create wiki
+GET  /api/wikis/{wiki_id}                   # Get wiki details
+PUT  /api/wikis/{wiki_id}                   # Update wiki
+DELETE /api/wikis/{wiki_id}                 # Delete wiki
+POST /api/wikis/{wiki_id}/links             # Link wiki to entity
+DELETE /api/wikis/{wiki_id}/links/{link_id} # Unlink from entity
+GET  /api/{entity_type}/{entity_id}/wikis   # Get wikis for entity
+```
+
+#### Card Endpoints (Updated)
+```
+PUT  /api/cards/{card_id}/epic              # Link card to epic (or null to unlink)
+GET  /api/cards/{card_id}/epic              # Get card's epic
+```
+
+## Files Created/Modified
+
+### Created
+- `backend/app/models/epic.py`
+- `backend/app/models/wiki.py`
+- `backend/migrations/versions/add_epic_and_wiki_models.py`
+
+### Modified
+- `backend/app/models/card.py` (added epic_id)
+- `backend/app/models/__init__.py` (added Epic, Wiki imports)
+
+## Testing the Implementation
+
+1. **Apply migration:**
+```bash
+cd backend
+source venv/bin/activate
+flask db upgrade
+```
+
+2. **Verify tables created:**
+```bash
+flask dbcurrent
+# Should show: add_epic_and_wiki_models
+```
+
+3. **Test in Python shell:**
+```python
+from app import create_app, db
+from app.models import Epic, Wiki, Card, Board
+
+app = create_app()
+with app.app_context():
+    # Create an epic
+    epic = Epic(name="My Epic", board_id=1, color="#3b82f6")
+    db.session.add(epic)
+    db.session.commit()
+    
+    # Create a wiki
+    wiki = Wiki(name="Security Guide", board_id=1, content={})
+    db.session.add(wiki)
+    db.session.commit()
+    
+    print(f"Epic created: {epic.to_dict()}")
+    print(f"Wiki created: {wiki.to_dict()}")
+```
+
+## Notes
+
+- All models follow the existing project patterns
+- Uses `db` from `app` module (not `flask_sqlalchemy` directly)
+- Proper foreign key constraints with CASCADE/SET NULL
+- Timestamps use UTC timezone
+- JSONB fields for flexible data storage
+- Indexed for optimal query performance

Makefile

@@ -21,6 +21,10 @@ install: ## Install dependencies
 	@echo "Installing frontend dependencies..."
 	cd frontend && npm install
 
+dev-backend-install:
+	@echo "Installing backend dependencies..."
+	. backend/venv/bin/activate && pip install -r backend/requirements/dev.txt
+	
 dev-services: ## Start development services (postgres & redis only)
 	@echo "Starting development services (postgres & redis)..."
 	docker compose -f docker-compose.dev.yml up -d
@@ -62,6 +66,9 @@ restart: ## Restart all services
 logs: ## Show logs from all services
 	docker compose logs -f
 
+dev-logs: ## Show logs from all services
+	docker compose -f docker-compose.dev.yml logs
+
 test: ## Run all tests
 	@echo "Running backend tests..."
 	cd backend && . venv/bin/activate && pytest

backend/.env.example

@@ -9,3 +9,8 @@ TEST_DATABASE_URL=sqlite:///test.db
 # Celery Configuration
 CELERY_BROKER_URL=redis://localhost:6379/0
 CELERY_RESULT_BACKEND=redis://localhost:6379/0
+
+# Minio configuration
+MINIO_ENDPOINT=localhost:9000
+MINIO_ACCESS_KEY=minioadmin
+MINIO_SECRET_KEY=minioadmin

backend/app/__init__.py

@@ -40,6 +40,13 @@ def create_app(config_name=None):
         app, resources={r"/api/*": {"origins": app.config.get("CORS_ORIGINS", "*")}}
     )
 
+    # Import storage extension
+    from app.services.storage.storage_extension import storage
+
+    if not (app.config.get("TESTING") or app.config.get("USE_MOCK_STORAGE")):
+        # Initialize storage extension (MinIO)
+        storage.init_app(app)
+
     # Initialize Celery
     from app.celery import init_celery
 

backend/app/config.py

@@ -46,11 +46,31 @@ class DevelopmentConfig(Config):
     DEBUG = True
     SQLALCHEMY_DATABASE_URI = os.environ["DATABASE_URL"]
 
+    # MinIO Configuration for Development
+    MINIO_ENDPOINT = os.environ.get("MINIO_ENDPOINT", "minio:9000")
+    MINIO_ACCESS_KEY = os.environ.get("MINIO_ACCESS_KEY", "minioadmin")
+    MINIO_SECRET_KEY = os.environ.get("MINIO_SECRET_KEY", "minioadmin")
+    MINIO_USE_SSL = os.environ.get("MINIO_USE_SSL", "false").lower() == "true"
+    MINIO_IMAGES_BUCKET = "kanban-images"
+    MINIO_DOCUMENTS_BUCKET = "kanban-documents"
+    MINIO_THUMBNAILS_BUCKET = "kanban-thumbnails"
+    MAX_UPLOAD_SIZE_IMAGE = 10 * 1024 * 1024
+    MAX_UPLOAD_SIZE_DOCUMENT = 50 * 1024 * 1024
+    ALLOWED_IMAGE_TYPES = [
+        "image/jpeg",
+        "image/png",
+        "image/gif",
+        "image/svg+xml",
+        "image/webp",
+    ]
+    ALLOWED_DOCUMENT_TYPES = ["application/pdf"]
+
 
 class TestingConfig(Config):
     """Testing configuration"""
 
     TESTING = True
+    USE_MOCK_STORAGE = True  # Use in-memory mock storage for tests
     SQLALCHEMY_DATABASE_URI = os.environ.get("TEST_DATABASE_URL")
     WTF_CSRF_ENABLED = False
 
@@ -63,6 +83,31 @@ class TestingConfig(Config):
         "pool_pre_ping": True,  # Verify connections before using
     }
 
+    # MinIO configuration (not used in tests due to USE_MOCK_STORAGE=True)
+    MINIO_ENDPOINT = "minio:9000"
+    MINIO_ACCESS_KEY = os.environ.get("MINIO_ACCESS_KEY", "minioadmin")
+    MINIO_SECRET_KEY = os.environ.get("MINIO_SECRET_KEY", "minioadmin")
+    MINIO_USE_SSL = os.environ.get("MINIO_USE_SSL", "false").lower() == "true"
+
+    # Bucket names (required for FileService even with mock storage)
+    MINIO_IMAGES_BUCKET = "kanban-images"
+    MINIO_DOCUMENTS_BUCKET = "kanban-documents"
+    MINIO_THUMBNAILS_BUCKET = "kanban-thumbnails"
+
+    # File upload limits
+    MAX_UPLOAD_SIZE_IMAGE = 10 * 1024 * 1024  # 10MB
+    MAX_UPLOAD_SIZE_DOCUMENT = 50 * 1024 * 1024  # 50MB
+
+    # Allowed file types
+    ALLOWED_IMAGE_TYPES = [
+        "image/jpeg",
+        "image/png",
+        "image/gif",
+        "image/svg+xml",
+        "image/webp",
+    ]
+    ALLOWED_DOCUMENT_TYPES = ["application/pdf"]
+
 
 class ProductionConfig(Config):
     """Production configuration"""
@@ -75,6 +120,31 @@ class ProductionConfig(Config):
     SESSION_COOKIE_HTTPONLY = True
     SESSION_COOKIE_SAMESITE = "Lax"
 
+    # MinIO Configuration
+    MINIO_ENDPOINT = os.environ.get("MINIO_ENDPOINT", "minio:9000")
+    MINIO_ACCESS_KEY = os.environ.get("MINIO_ACCESS_KEY", "minioadmin")
+    MINIO_SECRET_KEY = os.environ.get("MINIO_SECRET_KEY", "minioadmin")
+    MINIO_USE_SSL = os.environ.get("MINIO_USE_SSL", "true").lower() == "true"
+
+    # MinIO Buckets
+    MINIO_IMAGES_BUCKET = "kanban-images"
+    MINIO_DOCUMENTS_BUCKET = "kanban-documents"
+    MINIO_THUMBNAILS_BUCKET = "kanban-thumbnails"
+
+    # File Upload Limits (in bytes)
+    MAX_UPLOAD_SIZE_IMAGE = 10 * 1024 * 1024  # 10MB
+    MAX_UPLOAD_SIZE_DOCUMENT = 50 * 1024 * 1024  # 50MB
+
+    # Allowed File Types
+    ALLOWED_IMAGE_TYPES = [
+        "image/jpeg",
+        "image/png",
+        "image/gif",
+        "image/svg+xml",
+        "image/webp",
+    ]
+    ALLOWED_DOCUMENT_TYPES = ["application/pdf"]
+
 
 config_by_name = {
     "dev": DevelopmentConfig,

backend/app/decorators.py

@@ -3,7 +3,8 @@ from functools import wraps
 from flask import abort, g
 from flask_jwt_extended import get_jwt_identity
 
-from app.models import Board, Card, CheckItem, Checklist, Comment, List
+from app.models import (Board, Card, CheckItem, Checklist, Comment,
+                        FileAttachment, List)
 
 
 def get_current_user_id():
@@ -157,3 +158,166 @@ def load_comment_owned(f):
         return f(*args, **kwargs)
 
     return decorated_function
+
+
+def load_file_owned(f):
+    """
+    Loads a FileAttachment ensuring it belongs to the user.
+    Aborts with 404 if not found or not owned.
+    """
+
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        user_id = get_current_user_id()
+        file_id = kwargs.get("file_id")
+
+        # Filter by ID and user ID
+        attachment = FileAttachment.query.filter_by(
+            id=file_id, uploaded_by=user_id
+        ).first()
+
+        if not attachment:
+            abort(404)
+
+        kwargs["file"] = attachment
+        return f(*args, **kwargs)
+
+    return decorated_function
+
+
+def load_file_accessible(f):
+    """
+    Loads a FileAttachment ensuring the user can access it.
+    User can access if:
+    1. They uploaded the file, OR
+    2. The file is attached to an entity they own (via Board ownership)
+
+    Aborts with 404 if not found or not accessible.
+    """
+
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        user_id = get_current_user_id()
+        file_id = kwargs.get("file_id")
+
+        # Try to find file uploaded by user
+        attachment = FileAttachment.query.filter_by(
+            id=file_id, uploaded_by=user_id
+        ).first()
+
+        # If not found, check if attached to a Card that belongs to user's board
+        if not attachment:
+            # For Card attachments
+            card_attachment = (
+                FileAttachment.query.join(
+                    Card,
+                    (FileAttachment.attachable_type == "Card")
+                    & (FileAttachment.attachable_id == Card.id),
+                )
+                .join(Board)
+                .filter(
+                    FileAttachment.id == file_id,
+                    Board.user_id == user_id,
+                )
+                .first()
+            )
+            if card_attachment:
+                attachment = card_attachment
+
+        # If still not found, check if attached
+        # to a Comment that belongs to user's board
+        if not attachment:
+            # For Comment attachments
+            comment_attachment = (
+                FileAttachment.query.join(
+                    Comment,
+                    (FileAttachment.attachable_type == "Comment")
+                    & (FileAttachment.attachable_id == Comment.id),
+                )
+                .join(Card)
+                .join(Board)
+                .filter(
+                    FileAttachment.id == file_id,
+                    Board.user_id == user_id,
+                )
+                .first()
+            )
+            if comment_attachment:
+                attachment = comment_attachment
+
+        if not attachment:
+            abort(404)
+
+        kwargs["file"] = attachment
+        return f(*args, **kwargs)
+
+    return decorated_function
+
+
+def load_file_accessible_by_uuid(f):
+    """
+    Loads a FileAttachment by UUID ensuring the user can access it.
+    User can access if:
+    1. They uploaded the file, OR
+    2. The file is attached to an entity they own (via Board ownership)
+
+    Aborts with 404 if not found or not accessible.
+    """
+
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        user_id = get_current_user_id()
+        file_uuid = kwargs.get("file_uuid")
+
+        # Try to find file uploaded by user
+        attachment = FileAttachment.query.filter_by(
+            uuid=file_uuid, uploaded_by=user_id
+        ).first()
+
+        # If not found, check if attached to a Card that belongs to user's board
+        if not attachment:
+            # For Card attachments
+            card_attachment = (
+                FileAttachment.query.join(
+                    Card,
+                    (FileAttachment.attachable_type == "Card")
+                    & (FileAttachment.attachable_id == Card.id),
+                )
+                .join(Board)
+                .filter(
+                    FileAttachment.uuid == file_uuid,
+                    Board.user_id == user_id,
+                )
+                .first()
+            )
+            if card_attachment:
+                attachment = card_attachment
+
+        # If still not found, check if attached to a
+        # Comment that belongs to user's board
+        if not attachment:
+            # For Comment attachments
+            comment_attachment = (
+                FileAttachment.query.join(
+                    Comment,
+                    (FileAttachment.attachable_type == "Comment")
+                    & (FileAttachment.attachable_id == Comment.id),
+                )
+                .join(Card)
+                .join(Board)
+                .filter(
+                    FileAttachment.uuid == file_uuid,
+                    Board.user_id == user_id,
+                )
+                .first()
+            )
+            if comment_attachment:
+                attachment = comment_attachment
+
+        if not attachment:
+            abort(404)
+
+        kwargs["file"] = attachment
+        return f(*args, **kwargs)
+
+    return decorated_function

backend/app/models/__init__.py

@@ -4,11 +4,14 @@ from app.models.card_label import CardLabel
 from app.models.check_item import CheckItem
 from app.models.checklist import Checklist
 from app.models.comment import Comment
+from app.models.epic import Epic
+from app.models.file_attachment import FileAttachment
 from app.models.label import Label
 from app.models.list_model import List
 from app.models.order import Order, OrderItem
 from app.models.product import Product
 from app.models.user import User
+from app.models.wiki import Wiki
 
 __all__ = [
     "User",
@@ -23,4 +26,7 @@ __all__ = [
     "Checklist",
     "CheckItem",
     "Comment",
+    "FileAttachment",
+    "Epic",
+    "Wiki",
 ]

backend/app/models/card.py

@@ -32,6 +32,9 @@ class Card(db.Model):
         nullable=False,
         index=True,
     )
+    epic_id = db.Column(
+        db.Integer, db.ForeignKey("epics.id", ondelete="SET NULL"), index=True
+    )
 
     # Timestamps
     date_last_activity = db.Column(db.DateTime)
@@ -57,6 +60,14 @@ class Card(db.Model):
     comments = db.relationship(
         "Comment", backref="card", cascade="all, delete-orphan", lazy="dynamic"
     )
+    attachments = db.relationship(
+        "FileAttachment",
+        foreign_keys="FileAttachment.attachable_id",
+        primaryjoin="""and_(FileAttachment.attachable_id == Card.id,
+        FileAttachment.attachable_type == 'Card')""",
+        cascade="all, delete-orphan",
+        lazy="dynamic",
+    )
 
     def to_dict(self):
         """Convert card to dictionary"""
@@ -71,6 +82,7 @@ class Card(db.Model):
             "id_short": self.id_short,
             "board_id": self.board_id,
             "list_id": self.list_id,
+            "epic_id": self.epic_id,
             "date_last_activity": self.date_last_activity.isoformat()
             if self.date_last_activity
             else None,

backend/app/models/comment.py

@@ -30,6 +30,17 @@ class Comment(db.Model):
         onupdate=lambda: datetime.now(UTC),
     )
 
+    # Relationships
+    attachments = db.relationship(
+        "FileAttachment",
+        foreign_keys="FileAttachment.attachable_id",
+        primaryjoin="""and_(FileAttachment.attachable_id == Comment.id,
+        FileAttachment.attachable_type == 'Comment')""",
+        cascade="all, delete-orphan",
+        lazy="dynamic",
+        overlaps="attachments",
+    )
+
     def to_dict(self):
         """Convert comment to dictionary"""
         return {

backend/app/models/epic.py

@@ -0,0 +1,80 @@
+from datetime import UTC, datetime
+
+from sqlalchemy.dialects.postgresql import JSONB
+
+from app import db
+
+
+class Epic(db.Model):
+    """Epic model for tracking large features across multiple cards"""
+
+    __tablename__ = "epics"
+
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(200), nullable=False, index=True)
+    description = db.Column(db.Text)
+    content = db.Column(JSONB)  # Rich text content (Slate.js JSON)
+    color = db.Column(db.String(7))  # Hex color for epic badge
+    closed = db.Column(db.Boolean, default=False, index=True)
+    pos = db.Column(db.Float)  # Position for sorting in epic list
+    depth_limit = db.Column(db.Integer, default=5)  # Max nesting depth
+
+    # Foreign keys
+    board_id = db.Column(
+        db.Integer,
+        db.ForeignKey("boards.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
+    )
+    parent_epic_id = db.Column(
+        db.Integer, db.ForeignKey("epics.id", ondelete="SET NULL")
+    )
+
+    # Timestamps
+    date_last_activity = db.Column(db.DateTime)
+    created_at = db.Column(db.DateTime, default=lambda: datetime.now(UTC))
+    updated_at = db.Column(
+        db.DateTime,
+        default=lambda: datetime.now(UTC),
+        onupdate=lambda: datetime.now(UTC),
+    )
+
+    # JSON fields for metrics
+    metrics = db.Column(JSONB)  # {"card_count": 10}
+
+    # Relationships
+    board = db.relationship("Board", backref="epics")
+    parent_epic = db.relationship("Epic", remote_side=[id], backref="child_epics")
+    cards = db.relationship("Card", backref="epic", cascade="all, delete-orphan")
+    attachments = db.relationship(
+        "FileAttachment",
+        foreign_keys="FileAttachment.attachable_id",
+        primaryjoin="""and_(FileAttachment.attachable_id == Epic.id,
+        FileAttachment.attachable_type == 'Epic')""",
+        cascade="all, delete-orphan",
+        lazy="dynamic",
+    )
+
+    def to_dict(self):
+        """Convert epic to dictionary"""
+        return {
+            "id": self.id,
+            "name": self.name,
+            "description": self.description,
+            "content": self.content,
+            "color": self.color,
+            "closed": self.closed,
+            "pos": self.pos,
+            "depth_limit": self.depth_limit,
+            "board_id": self.board_id,
+            "parent_epic_id": self.parent_epic_id,
+            "date_last_activity": self.date_last_activity.isoformat()
+            if self.date_last_activity
+            else None,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+            "metrics": self.metrics or {"card_count": 0},
+        }
+
+    def __repr__(self):
+        return f"<Epic {self.name}>"

backend/app/models/file_attachment.py

@@ -0,0 +1,75 @@
+import uuid
+from datetime import UTC, datetime
+
+from sqlalchemy import Index
+
+from app import db
+
+
+class FileAttachment(db.Model):
+    """Polymorphic file attachment model for Cards, Comments, and other entities"""
+
+    __tablename__ = "file_attachments"
+
+    id = db.Column(db.Integer, primary_key=True)
+    uuid = db.Column(
+        db.String(36), nullable=False, unique=True, default=lambda: str(uuid.uuid4())
+    )
+    filename = db.Column(db.String(255), nullable=False)
+    original_name = db.Column(db.String(255), nullable=False)
+    file_type = db.Column(db.String(50), nullable=False)  # 'image', 'pdf', 'document'
+    mime_type = db.Column(db.String(100), nullable=False)
+    file_size = db.Column(db.Integer, nullable=False)
+
+    # MinIO storage information
+    minio_bucket = db.Column(db.String(100), nullable=False)
+    minio_object_name = db.Column(db.String(255), nullable=False, unique=True)
+
+    # Thumbnail information (optional, for images)
+    thumbnail_minio_object_name = db.Column(db.String(255))
+    thumbnail_minio_bucket = db.Column(db.String(100))
+
+    # Polymorphic relationship - can attach to different entity types
+    attachable_type = db.Column(
+        db.String(50), nullable=False
+    )  # 'Card', 'Comment', 'Epic'
+    attachable_id = db.Column(db.Integer, nullable=False)  # ID of the attached entity
+
+    # Upload metadata
+    uploaded_by = db.Column(
+        db.Integer, db.ForeignKey("users.id", ondelete="CASCADE"), nullable=False
+    )
+    created_at = db.Column(db.DateTime, default=lambda: datetime.now(UTC))
+
+    # Relationships
+    uploader = db.relationship("User", backref="uploaded_files")
+
+    # Indexes for efficient queries
+    __table_args__ = (
+        Index("ix_file_attachments_attachable", "attachable_type", "attachable_id"),
+        Index("ix_file_attachments_user", "uploaded_by"),
+        Index("ix_file_attachments_uuid", "uuid"),
+    )
+
+    def to_dict(self):
+        """Convert file attachment to dictionary"""
+        return {
+            "id": self.id,
+            "uuid": self.uuid,
+            "filename": self.filename,
+            "original_name": self.original_name,
+            "file_type": self.file_type,
+            "mime_type": self.mime_type,
+            "file_size": self.file_size,
+            "minio_bucket": self.minio_bucket,
+            "minio_object_name": self.minio_object_name,
+            "thumbnail_minio_object_name": self.thumbnail_minio_object_name,
+            "thumbnail_minio_bucket": self.thumbnail_minio_bucket,
+            "attachable_type": self.attachable_type,
+            "attachable_id": self.attachable_id,
+            "uploaded_by": self.uploaded_by,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+        }
+
+    def __repr__(self):
+        return f"<FileAttachment {self.original_name} ({self.file_type})>"

backend/app/models/wiki.py

@@ -0,0 +1,88 @@
+from datetime import UTC, datetime
+
+from sqlalchemy.dialects.postgresql import JSONB
+
+from app import db
+
+wiki_entity_links = db.Table(
+    "wiki_entity_links",
+    db.Column(
+        "wiki_id",
+        db.Integer,
+        db.ForeignKey("wikis.id", ondelete="CASCADE"),
+        primary_key=True,
+    ),
+    db.Column("entity_type", db.String(50), nullable=False),  # 'Card', 'Epic'
+    db.Column("entity_id", db.Integer, nullable=False),  # ID of the linked entity
+    db.Column("created_at", db.DateTime, default=lambda: datetime.now(UTC)),
+    db.Column("linked_by", db.Integer, db.ForeignKey("users.id", ondelete="SET NULL")),
+)
+
+
+class Wiki(db.Model):
+    """Wiki model for reusable rich text content within a board"""
+
+    __tablename__ = "wikis"
+
+    id = db.Column(db.Integer, primary_key=True)
+    name = db.Column(db.String(200), nullable=False, index=True)
+    slug = db.Column(db.String(255), index=True)  # URL-friendly identifier
+    content = db.Column(JSONB, nullable=False)  # Rich text content (Slate.js JSON)
+    summary = db.Column(db.Text)  # Brief description/abstract
+    category = db.Column(db.String(100))  # Optional categorization
+
+    # Foreign keys
+    board_id = db.Column(
+        db.Integer,
+        db.ForeignKey("boards.id", ondelete="CASCADE"),
+        nullable=False,
+        index=True,
+    )
+    created_by = db.Column(
+        db.Integer,
+        db.ForeignKey("users.id", ondelete="SET NULL"),
+    )
+    updated_by = db.Column(
+        db.Integer,
+        db.ForeignKey("users.id", ondelete="SET NULL"),
+    )
+
+    # Timestamps
+    created_at = db.Column(db.DateTime, default=lambda: datetime.now(UTC))
+    updated_at = db.Column(
+        db.DateTime,
+        default=lambda: datetime.now(UTC),
+        onupdate=lambda: datetime.now(UTC),
+    )
+
+    # JSON fields
+    tags = db.Column(JSONB)  # List of tags for organization: ["security", "api"]
+
+    # Relationships
+    board = db.relationship("Board", backref="wikis")
+    creator = db.relationship(
+        "User", foreign_keys=[created_by], backref="created_wikis"
+    )
+    updater = db.relationship(
+        "User", foreign_keys=[updated_by], backref="updated_wikis"
+    )
+
+    def to_dict(self):
+        """Convert wiki to dictionary"""
+        return {
+            "id": self.id,
+            "name": self.name,
+            "slug": self.slug,
+            "content": self.content,
+            "summary": self.summary,
+            "category": self.category,
+            "board_id": self.board_id,
+            "tags": self.tags or [],
+            "created_by": self.created_by,
+            "updated_by": self.updated_by,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+        }
+
+    def __repr__(self):
+        return f"<Wiki {self.name}>"

backend/app/routes/kanban/__init__.py

@@ -6,8 +6,8 @@ kanban_bp = Blueprint("kanban", __name__)
 # Import all route modules to register their routes to this blueprint
 
 # fmt: off
-from . import (boards, cards, checklists, comments, labels,  # noqa: F401 E402
-               lists)
+from . import (boards, cards, checklists, comments, epics,  # noqa: F401 E402
+               files, labels, lists, wikis)
 
 # fmt: on
 

backend/app/routes/kanban/epics.py

@@ -0,0 +1,158 @@
+"""Routes for Epic CRUD operations."""
+
+from flask import request
+from flask_jwt_extended import jwt_required
+from flask_pydantic import validate
+
+from app import db
+from app.models import Board, Card, Epic
+from app.schemas import EpicCreateRequest, EpicResponse, EpicUpdateRequest
+
+from . import kanban_bp
+
+
+@kanban_bp.route("/boards/<int:board_id>/epics", methods=["GET"])
+@jwt_required()
+def get_board_epics(board_id):
+    """Get all epics for a board."""
+    board = db.session.get(Board, board_id)
+    if not board:
+        return {"error": "Board not found"}, 404
+
+    epics = Epic.query.filter_by(board_id=board_id).all()
+    return [EpicResponse.model_validate(epic).model_dump() for epic in epics], 200
+
+
+@kanban_bp.route("/boards/<int:board_id>/epics", methods=["POST"])
+@jwt_required()
+@validate(body=EpicCreateRequest)
+def create_epic(board_id, body: EpicCreateRequest):
+    """Create a new epic for a board."""
+    board = db.session.get(Board, board_id)
+    if not board:
+        return {"error": "Board not found"}, 404
+
+    epic = Epic(
+        board_id=board_id,
+        name=body.name,
+        description=body.description,
+        content=body.content,
+        color=body.color,
+        closed=False,
+        pos=body.pos,
+        depth_limit=body.depth_limit,
+        parent_epic_id=body.parent_epic_id,
+        metrics={"card_count": 0, "progress": 0},
+    )
+
+    db.session.add(epic)
+    db.session.commit()
+
+    return EpicResponse.model_validate(epic).model_dump(), 201
+
+
+@kanban_bp.route("/epics/<int:epic_id>", methods=["GET"])
+@jwt_required()
+def get_epic(epic_id):
+    """Get a specific epic with details."""
+    epic = db.session.get(Epic, epic_id)
+    if not epic:
+        return {"error": "Epic not found"}, 404
+
+    # Get cards for this epic
+    cards = Card.query.filter_by(epic_id=epic_id).all()
+    epic_dict = EpicResponse.model_validate(epic).model_dump()
+    epic_dict["cards"] = [card.to_dict() for card in cards]
+
+    return epic_dict, 200
+
+
+@kanban_bp.route("/epics/<int:epic_id>", methods=["PUT"])
+@jwt_required()
+@validate(body=EpicUpdateRequest)
+def update_epic(epic_id, body: EpicUpdateRequest):
+    """Update an epic."""
+    epic = db.session.get(Epic, epic_id)
+    if not epic:
+        return {"error": "Epic not found"}, 404
+
+    # Update fields
+    if body.name is not None:
+        epic.name = body.name
+    if body.description is not None:
+        epic.description = body.description
+    if body.content is not None:
+        epic.content = body.content
+    if body.color is not None:
+        epic.color = body.color
+    if body.closed is not None:
+        epic.closed = body.closed
+    if body.pos is not None:
+        epic.pos = body.pos
+    if body.depth_limit is not None:
+        epic.depth_limit = body.depth_limit
+    if body.parent_epic_id is not None:
+        epic.parent_epic_id = body.parent_epic_id
+
+    db.session.commit()
+
+    return EpicResponse.model_validate(epic).model_dump(), 200
+
+
+@kanban_bp.route("/epics/<int:epic_id>", methods=["DELETE"])
+@jwt_required()
+def delete_epic(epic_id):
+    """Delete an epic."""
+    epic = db.session.get(Epic, epic_id)
+    if not epic:
+        return {"error": "Epic not found"}, 404
+
+    # Unlink all cards from this epic
+    Card.query.filter_by(epic_id=epic_id).update({"epic_id": None})
+
+    # Delete epic
+    db.session.delete(epic)
+    db.session.commit()
+
+    return {"message": "Epic deleted successfully"}, 200
+
+
+@kanban_bp.route("/cards/<int:card_id>/epics", methods=["POST"])
+@jwt_required()
+def add_epic_to_card(card_id):
+    """Link an epic to a card."""
+    card = db.session.get(Card, card_id)
+    if not card:
+        return {"error": "Card not found"}, 404
+
+    data = request.get_json()
+    epic_id = data.get("epic_id")
+
+    if not epic_id:
+        return {"error": "epic_id is required"}, 400
+
+    epic = db.session.get(Epic, epic_id)
+    if not epic:
+        return {"error": "Epic not found"}, 404
+
+    card.epic_id = epic_id
+    db.session.commit()
+
+    return card.to_dict(), 200
+
+
+@kanban_bp.route("/cards/<int:card_id>/epics/<int:epic_id>", methods=["DELETE"])
+@jwt_required()
+def remove_epic_from_card(card_id, epic_id):
+    """Unlink an epic from a card."""
+    card = db.session.get(Card, card_id)
+    if not card:
+        return {"error": "Card not found"}, 404
+
+    if card.epic_id != epic_id:
+        return {"error": "Card is not linked to this epic"}, 400
+
+    card.epic_id = None
+    db.session.commit()
+
+    return {"message": "Epic unlinked from card successfully"}, 200

backend/app/routes/kanban/files.py

@@ -0,0 +1,299 @@
+"""Routes for file upload and management"""
+
+from io import BytesIO
+
+from flask import Response, request
+from flask_jwt_extended import jwt_required
+from werkzeug.datastructures import FileStorage
+
+from app.decorators import (get_current_user_id, load_card_owned,
+                            load_comment_owned, load_file_accessible_by_uuid)
+from app.schemas import (FileAttachmentWithUrlResponse, FileDeleteResponse,
+                         MultipleFilesResponse)
+from app.services.storage.attachment_service import AttachmentService
+from app.services.storage.file_service import FileService
+
+from . import kanban_bp
+
+
+@kanban_bp.route("/files/<string:file_uuid>", methods=["GET"])
+@jwt_required()
+@load_file_accessible_by_uuid
+def get_file(file_uuid, file):
+    """Get file information with UUID-based URLs"""
+    attachment_service = AttachmentService()
+    file_info = attachment_service.get_attachment_with_url(file.id)
+
+    return file_info, 200
+
+
+@kanban_bp.route("/files/<string:file_uuid>", methods=["DELETE"])
+@jwt_required()
+@load_file_accessible_by_uuid
+def delete_file(file_uuid, file):
+    """Delete a file"""
+    attachment_service = AttachmentService()
+    success = attachment_service.delete_attachment(file.id)
+
+    if not success:
+        return {"error": "Failed to delete file"}, 500
+
+    return FileDeleteResponse(message="File deleted", file_id=file.id).model_dump(), 200
+
+
+@kanban_bp.route("/cards/<int:card_id>/attachments", methods=["GET"])
+@jwt_required()
+@load_card_owned
+def get_card_attachments(card_id, card):
+    """Get all attachments for a card"""
+    attachment_service = AttachmentService()
+    attachments = attachment_service.get_card_attachments(card_id)
+
+    # Get URLs for each attachment
+    files_with_urls = []
+    for attachment in attachments:
+        file_info = attachment_service.get_attachment_with_url(attachment.id)
+        files_with_urls.append(file_info)
+
+    return (
+        MultipleFilesResponse(
+            files=files_with_urls,
+            count=len(attachments),
+        ).model_dump(),
+        200,
+    )
+
+
+@kanban_bp.route("/cards/<int:card_id>/attachments", methods=["POST"])
+@jwt_required()
+@load_card_owned
+def upload_card_attachment(card_id, card):
+    """Upload a file to a specific card"""
+    return _upload_file(entity_type="Card", entity_id=card_id)
+
+
+@kanban_bp.route("/comments/<int:comment_id>/attachments", methods=["GET"])
+@jwt_required()
+@load_comment_owned
+def get_comment_attachments(comment_id, comment):
+    """Get all attachments for a comment"""
+    attachment_service = AttachmentService()
+    attachments = attachment_service.get_comment_attachments(comment_id)
+
+    # Get URLs for each attachment
+    files_with_urls = []
+    for attachment in attachments:
+        file_info = attachment_service.get_attachment_with_url(attachment.id)
+        files_with_urls.append(file_info)
+
+    return (
+        MultipleFilesResponse(
+            files=files_with_urls,
+            count=len(attachments),
+        ).model_dump(),
+        200,
+    )
+
+
+@kanban_bp.route("/comments/<int:comment_id>/attachments", methods=["POST"])
+@jwt_required()
+@load_comment_owned
+def upload_comment_attachment(comment_id, comment):
+    """Upload a file to a specific comment"""
+    return _upload_file(entity_type="Comment", entity_id=comment_id)
+
+
+@kanban_bp.route("/files/upload", methods=["POST"])
+@jwt_required()
+def upload_file():
+    """Upload a file to an entity (Card, Comment, etc.)"""
+    # Validate request
+    entity_type = request.form.get("entity_type")
+    entity_id = request.form.get("entity_id")
+
+    if not entity_type or not entity_id:
+        return {"error": "entity_type and entity_id are required"}, 400
+
+    # Validate entity_type
+    valid_types = ["Card", "Comment", "Epic", "Board"]
+    if entity_type not in valid_types:
+        return {
+            "error": f"Invalid entity_type: {entity_type}. Must be one of {valid_types}"
+        }, 400
+
+    return _upload_file(entity_type=entity_type, entity_id=int(entity_id))
+
+
+def _upload_file(entity_type: str, entity_id: int):
+    """
+    Helper function to handle file upload
+
+    Args:
+        entity_type: Type of entity (Card, Comment, etc.)
+        entity_id: ID of the entity
+
+    Returns:
+        tuple: (response_dict, status_code)
+    """
+    # Get file from request
+    if "file" not in request.files:
+        return {"error": "No file provided"}, 400
+
+    file: FileStorage = request.files["file"]
+    if file.filename == "":
+        return {"error": "No file selected"}, 400
+
+    # Get user ID
+    user_id = get_current_user_id()
+
+    # Create BytesIO from file
+    file_data = BytesIO()
+    file.save(file_data)
+    file_size = len(file_data.getvalue())
+
+    # Get MIME type
+    mime_type = file.mimetype or "application/octet-stream"
+
+    # Upload file
+    attachment_service = AttachmentService()
+    attachment = attachment_service.attach_file_to_entity(
+        entity_type=entity_type,
+        entity_id=entity_id,
+        file_data=file_data,
+        filename=file.filename,
+        content_type=mime_type,
+        file_size=file_size,
+        uploaded_by=user_id,
+    )
+
+    # Get attachment with URLs for response
+    file_info = attachment_service.get_attachment_with_url(attachment.id)
+    return FileAttachmentWithUrlResponse(**file_info).model_dump(), 201
+
+
+@kanban_bp.route("/files/<string:file_uuid>/download", methods=["GET"])
+@jwt_required()
+@load_file_accessible_by_uuid
+def download_file(file_uuid, file):
+    """
+    Download a file through secure Flask proxy using UUID
+
+    This route serves as a proxy to MinIO, hiding the MinIO server
+    from the frontend and ensuring authentication/authorization.
+
+    Args:
+        file_uuid: UUID of the file attachment
+        file: FileAttachment (injected by @load_file_accessible_by_uuid decorator)
+
+    Returns:
+        Response: File data with proper headers
+    """
+    file_service = FileService()
+
+    # Download file from MinIO
+    file_data = file_service.storage.download_file(
+        file.minio_bucket, file.minio_object_name
+    )
+
+    # Get file info for proper headers
+    file_info = file_service.storage.get_file_info(
+        file.minio_bucket, file.minio_object_name
+    )
+
+    # Create Flask Response with file data
+    return Response(
+        file_data.getvalue(),
+        mimetype=file.mime_type,
+        headers={
+            "Content-Disposition": f'attachment; filename="{file.original_name}"',
+            "Content-Length": str(file_info["size"]),
+            "Cache-Control": "private, max-age=3600",  # Cache for 1 hour
+        },
+    )
+
+
+@kanban_bp.route("/files/<string:file_uuid>/thumbnail", methods=["GET"])
+@jwt_required()
+@load_file_accessible_by_uuid
+def download_thumbnail(file_uuid, file):
+    """
+    Download a file thumbnail through secure Flask proxy using UUID
+
+    This route serves as a proxy to MinIO for thumbnails,
+    ensuring authentication with JWT.
+
+    Args:
+        file_uuid: UUID of the file attachment
+        file: FileAttachment (injected by @load_file_accessible_by_uuid decorator)
+
+    Returns:
+        Response: Thumbnail image data with proper headers
+    """
+    # Check if thumbnail exists
+    if not file.thumbnail_minio_bucket or not file.thumbnail_minio_object_name:
+        return {"error": "Thumbnail not available"}, 404
+
+    file_service = FileService()
+
+    # Download thumbnail from MinIO
+    thumbnail_data = file_service.storage.download_file(
+        file.thumbnail_minio_bucket,
+        file.thumbnail_minio_object_name,
+    )
+
+    # Get thumbnail info for proper headers
+    thumb_info = file_service.storage.get_file_info(
+        file.thumbnail_minio_bucket,
+        file.thumbnail_minio_object_name,
+    )
+
+    # Create Flask Response with thumbnail data
+    return Response(
+        thumbnail_data.getvalue(),
+        mimetype="image/jpeg",
+        headers={
+            "Content-Length": str(thumb_info["size"]),
+            "Cache-Control": "private, max-age=3600",
+        },
+    )
+
+
+@kanban_bp.route("/files/<string:file_uuid>/view", methods=["GET"])
+@jwt_required()
+@load_file_accessible_by_uuid
+def view_file(file_uuid, file):
+    """
+    View a file inline through secure Flask proxy using UUID
+
+    Similar to download, but uses inline disposition so browsers
+    display the file instead of downloading it.
+
+    Args:
+        file_uuid: UUID of the file attachment
+        file: FileAttachment (injected by @load_file_accessible_by_uuid decorator)
+
+    Returns:
+        Response: File data with proper headers
+    """
+    file_service = FileService()
+
+    # Download file from MinIO
+    file_data = file_service.storage.download_file(
+        file.minio_bucket, file.minio_object_name
+    )
+
+    # Get file info for proper headers
+    file_info = file_service.storage.get_file_info(
+        file.minio_bucket, file.minio_object_name
+    )
+
+    # Create Flask Response with file data (inline disposition)
+    return Response(
+        file_data.getvalue(),
+        mimetype=file.mime_type,
+        headers={
+            "Content-Disposition": f'inline; filename="{file.original_name}"',
+            "Content-Length": str(file_info["size"]),
+            "Cache-Control": "private, max-age=3600",  # Cache for 1 hour
+        },
+    )

backend/app/routes/kanban/wikis.py

@@ -0,0 +1,127 @@
+"""Routes for Wiki CRUD operations."""
+
+import re
+
+from flask_jwt_extended import get_jwt_identity, jwt_required
+from flask_pydantic import validate
+
+from app import db
+from app.models import Board, Wiki
+from app.schemas import WikiCreateRequest, WikiResponse, WikiUpdateRequest
+
+from . import kanban_bp
+
+
+def generate_slug(name):
+    """Generate URL-friendly slug from name."""
+    slug = name.lower()
+    slug = re.sub(r"[^a-z0-9\s-]", "", slug)
+    slug = re.sub(r"\s+", "-", slug)
+    slug = slug.strip("-")
+    return slug
+
+
+@kanban_bp.route("/boards/<int:board_id>/wikis", methods=["GET"])
+@jwt_required()
+def get_board_wikis(board_id):
+    """Get all wikis for a board."""
+    board = db.session.get(Board, board_id)
+    if not board:
+        return {"error": "Board not found"}, 404
+
+    wikis = Wiki.query.filter_by(board_id=board_id).all()
+    return [WikiResponse.model_validate(wiki).model_dump() for wiki in wikis], 200
+
+
+@kanban_bp.route("/boards/<int:board_id>/wikis", methods=["POST"])
+@jwt_required()
+@validate(body=WikiCreateRequest)
+def create_wiki(board_id, body: WikiCreateRequest):
+    """Create a new wiki for a board."""
+    board = db.session.get(Board, board_id)
+    if not board:
+        return {"error": "Board not found"}, 404
+
+    # Generate slug if not provided
+    slug = body.slug
+    if not slug:
+        slug = generate_slug(body.name)
+
+        # Ensure uniqueness
+        counter = 1
+        original_slug = slug
+        while Wiki.query.filter_by(slug=slug).first():
+            slug = f"{original_slug}-{counter}"
+            counter += 1
+
+    wiki = Wiki(
+        board_id=board_id,
+        name=body.name,
+        slug=slug,
+        content=body.content,
+        summary=body.summary,
+        category=body.category,
+        tags=body.tags,
+        created_by=get_jwt_identity(),
+        updated_by=get_jwt_identity(),
+    )
+
+    db.session.add(wiki)
+    db.session.commit()
+
+    return WikiResponse.model_validate(wiki).model_dump(), 201
+
+
+@kanban_bp.route("/wikis/<int:wiki_id>", methods=["GET"])
+@jwt_required()
+def get_wiki(wiki_id):
+    """Get a specific wiki with details."""
+    wiki = db.session.get(Wiki, wiki_id)
+    if not wiki:
+        return {"error": "Wiki not found"}, 404
+
+    return WikiResponse.model_validate(wiki).model_dump(), 200
+
+
+@kanban_bp.route("/wikis/<int:wiki_id>", methods=["PUT"])
+@jwt_required()
+@validate(body=WikiUpdateRequest)
+def update_wiki(wiki_id, body: WikiUpdateRequest):
+    """Update a wiki."""
+    wiki = db.session.get(Wiki, wiki_id)
+    if not wiki:
+        return {"error": "Wiki not found"}, 404
+
+    # Update fields
+    if body.name is not None:
+        wiki.name = body.name
+    if body.slug is not None:
+        wiki.slug = body.slug
+    if body.content is not None:
+        wiki.content = body.content
+    if body.summary is not None:
+        wiki.summary = body.summary
+    if body.category is not None:
+        wiki.category = body.category
+    if body.tags is not None:
+        wiki.tags = body.tags
+
+    wiki.updated_by = get_jwt_identity()
+    db.session.commit()
+
+    return WikiResponse.model_validate(wiki).model_dump(), 200
+
+
+@kanban_bp.route("/wikis/<int:wiki_id>", methods=["DELETE"])
+@jwt_required()
+def delete_wiki(wiki_id):
+    """Delete a wiki."""
+    wiki = db.session.get(Wiki, wiki_id)
+    if not wiki:
+        return {"error": "Wiki not found"}, 404
+
+    # Delete wiki (cascades to wiki_entity_links)
+    db.session.delete(wiki)
+    db.session.commit()
+
+    return {"message": "Wiki deleted successfully"}, 200

backend/app/schemas/__init__.py

@@ -7,9 +7,17 @@ from app.schemas.check_item import CheckItemCreateRequest, CheckItemResponse
 from app.schemas.checklist import ChecklistCreateRequest, ChecklistResponse
 from app.schemas.comment import (CommentCreateRequest, CommentResponse,
                                  CommentWithUserResponse)
+from app.schemas.epic import (EpicCreateRequest, EpicResponse,
+                              EpicUpdateRequest, EpicWithCardsResponse)
+from app.schemas.file_attachment import (FileAttachmentWithUrlResponse,
+                                         FileDeleteResponse, FileUploadRequest,
+                                         MultipleFilesResponse,
+                                         ValidationError)
 from app.schemas.label import LabelCreateRequest, LabelResponse
 from app.schemas.list_model import ListCreateRequest, ListResponse
 from app.schemas.product import ProductCreateRequest, ProductResponse
+from app.schemas.wiki import (WikiCreateRequest, WikiEntityLink,
+                              WikiLinkRequest, WikiResponse, WikiUpdateRequest)
 
 __all__ = [
     # Product schemas
@@ -36,7 +44,25 @@ __all__ = [
     # Comment schemas
     "CommentCreateRequest",
     "CommentResponse",
+    # File Attachment schemas
+    "FileAttachmentWithUrlResponse",
+    "FileDeleteResponse",
+    "FileUploadRequest",
+    "MultipleFilesResponse",
+    "ValidationError",
+    # Composite schemas
     "BoardWithDetailsResponse",
     "CardWithDetailsResponse",
     "CommentWithUserResponse",
+    # Epic schemas
+    "EpicCreateRequest",
+    "EpicResponse",
+    "EpicUpdateRequest",
+    "EpicWithCardsResponse",
+    # Wiki schemas
+    "WikiCreateRequest",
+    "WikiResponse",
+    "WikiUpdateRequest",
+    "WikiEntityLink",
+    "WikiLinkRequest",
 ]

backend/app/schemas/epic.py

@@ -0,0 +1,132 @@
+"""Pydantic schemas for Epic model"""
+from datetime import datetime
+from typing import Any, Dict, List, Optional
+
+from pydantic import BaseModel, ConfigDict, Field
+
+
+class EpicCreateRequest(BaseModel):
+    """Schema for creating a new epic"""
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "name": "User Authentication",
+                "description": "Implement login and registration",
+                "content": [
+                    {"type": "paragraph", "children": [{"text": "Details..."}]}
+                ],
+                "color": "#3b82f6",
+                "pos": 1.0,
+                "depth_limit": 5,
+                "parent_epic_id": None,
+            }
+        }
+    )
+
+    name: str = Field(..., min_length=1, max_length=200, description="Epic name")
+    description: Optional[str] = Field(None, description="Epic description")
+    content: Optional[Any] = Field(None, description="Rich text content")
+    color: Optional[str] = Field(None, max_length=7, description="Hex color code")
+    pos: Optional[float] = Field(None, description="Position for ordering")
+    depth_limit: Optional[int] = Field(
+        None, ge=1, le=10, description="Maximum depth for hierarchy"
+    )
+    parent_epic_id: Optional[int] = Field(
+        None, description="Parent epic ID for nesting"
+    )
+
+
+class EpicResponse(BaseModel):
+    """Schema for epic response"""
+
+    model_config = ConfigDict(
+        from_attributes=True,
+        json_schema_extra={
+            "example": {
+                "id": 1,
+                "name": "User Authentication",
+                "description": "Implement login and registration",
+                "content": [
+                    {"type": "paragraph", "children": [{"text": "Details..."}]}
+                ],
+                "color": "#3b82f6",
+                "closed": False,
+                "pos": 1.0,
+                "depth_limit": 5,
+                "board_id": 1,
+                "parent_epic_id": None,
+                "metrics": {"card_count": 5, "progress": 60},
+                "date_last_activity": "2024-01-15T10:30:00",
+                "created_at": "2024-01-01T10:00:00",
+                "updated_at": "2024-01-15T10:30:00",
+            }
+        },
+    )
+
+    id: int
+    name: str
+    description: Optional[str] = None
+    content: Optional[Any] = None
+    color: Optional[str] = None
+    closed: bool
+    pos: Optional[float] = None
+    depth_limit: Optional[int] = None
+    board_id: int
+    parent_epic_id: Optional[int] = None
+    metrics: Optional[Dict[str, Any]] = None
+    date_last_activity: Optional[datetime] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+
+class EpicUpdateRequest(BaseModel):
+    """Schema for updating an epic"""
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "name": "Updated Epic Name",
+                "description": "Updated description",
+                "content": [
+                    {"type": "paragraph", "children": [{"text": "Updated..."}]}
+                ],
+                "color": "#ef4444",
+                "closed": True,
+                "pos": 2.0,
+                "depth_limit": 3,
+                "parent_epic_id": 2,
+            }
+        }
+    )
+
+    name: Optional[str] = Field(None, min_length=1, max_length=200)
+    description: Optional[str] = None
+    content: Optional[Any] = None
+    color: Optional[str] = Field(None, max_length=7)
+    closed: Optional[bool] = None
+    pos: Optional[float] = None
+    depth_limit: Optional[int] = Field(None, ge=1, le=10)
+    parent_epic_id: Optional[int] = None
+
+
+class EpicWithCardsResponse(BaseModel):
+    """Schema for epic response with cards"""
+
+    model_config = ConfigDict(from_attributes=True)
+
+    id: int
+    name: str
+    description: Optional[str] = None
+    content: Optional[Any] = None
+    color: Optional[str] = None
+    closed: bool
+    pos: Optional[float] = None
+    depth_limit: Optional[int] = None
+    board_id: int
+    parent_epic_id: Optional[int] = None
+    metrics: Optional[Dict[str, Any]] = None
+    date_last_activity: Optional[datetime] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+    cards: List[Dict[str, Any]] = Field(default_factory=list)

backend/app/schemas/file_attachment.py

@@ -0,0 +1,72 @@
+"""Pydantic schemas for file attachments"""
+
+from datetime import datetime
+from typing import Optional
+
+from pydantic import (BaseModel, ConfigDict, Field, field_serializer,
+                      field_validator)
+
+
+class FileUploadRequest(BaseModel):
+    """Schema for file upload request"""
+
+    entity_type: str = Field(..., description="Type of entity (Card, Comment, etc.)")
+    entity_id: int = Field(..., description="ID of entity")
+
+    @field_validator("entity_type")
+    @classmethod
+    def validate_entity_type(cls, v: str) -> str:
+        """Validate entity type is allowed"""
+        valid_types = ["Card", "Comment", "Epic", "Board"]
+        if v not in valid_types:
+            raise ValueError(f"Invalid entity_type: {v}. Must be one of {valid_types}")
+        return v
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class FileAttachmentWithUrlResponse(BaseModel):
+    """
+    Schema for file attachment with secure URLs
+
+    Security: Only exposes public-facing information.
+    Internal details (MinIO paths, IDs, etc.) are hidden.
+    """
+
+    uuid: str
+    original_name: str
+    file_type: str
+    file_size: int
+    created_at: datetime
+    download_url: str
+    thumbnail_url: Optional[str] = None
+    view_url: str
+    mime_type: str
+
+    @field_serializer("created_at")
+    def serialize_created_at(self, value: datetime) -> str:
+        """Serialize datetime to ISO format string"""
+        return value.isoformat() if value else None
+
+    model_config = ConfigDict(from_attributes=True)
+
+
+class FileDeleteResponse(BaseModel):
+    """Schema for file delete response"""
+
+    message: str = Field(..., description="Deletion status message")
+    file_id: int = Field(..., description="ID of deleted file")
+
+
+class MultipleFilesResponse(BaseModel):
+    """Schema for multiple files response"""
+
+    files: list[FileAttachmentWithUrlResponse]
+    count: int = Field(..., description="Number of files")
+
+
+class ValidationError(BaseModel):
+    """Schema for validation errors"""
+
+    error: str = Field(..., description="Error message")
+    details: Optional[dict] = None

backend/app/schemas/wiki.py

@@ -0,0 +1,167 @@
+"""Pydantic schemas for Wiki model"""
+from datetime import datetime
+from typing import Any, List, Optional
+
+from pydantic import BaseModel, ConfigDict, Field, field_validator
+
+
+class WikiCreateRequest(BaseModel):
+    """Schema for creating a new wiki"""
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "name": "Security Guidelines",
+                "slug": "security-guidelines",
+                "content": [
+                    {"type": "paragraph", "children": [{"text": "Security rules..."}]}
+                ],
+                "summary": "Brief security overview",
+                "category": "Documentation",
+                "tags": ["security", "guidelines"],
+            }
+        }
+    )
+
+    name: str = Field(..., min_length=1, max_length=200, description="Wiki name")
+    slug: Optional[str] = Field(None, max_length=200, description="URL-friendly slug")
+    content: Any = Field(..., description="Rich text content")
+    summary: Optional[str] = Field(None, description="Brief summary")
+    category: Optional[str] = Field(None, max_length=100, description="Wiki category")
+    tags: Optional[List[str]] = Field(None, description="Wiki tags")
+
+    @field_validator("slug")
+    @classmethod
+    def validate_slug(cls, v):
+        """Validate slug is URL-friendly."""
+        if v and not v.islower():
+            raise ValueError("Slug must be lowercase")
+        if v and not all(c.isalnum() or c == "-" for c in v):
+            raise ValueError(
+                "Slug must contain only lowercase letters, numbers, and hyphens"
+            )
+        return v
+
+
+class WikiResponse(BaseModel):
+    """Schema for wiki response"""
+
+    model_config = ConfigDict(
+        from_attributes=True,
+        json_schema_extra={
+            "example": {
+                "id": 1,
+                "name": "Security Guidelines",
+                "slug": "security-guidelines",
+                "content": [
+                    {"type": "paragraph", "children": [{"text": "Security rules..."}]}
+                ],
+                "summary": "Brief security overview",
+                "category": "Documentation",
+                "tags": ["security", "guidelines"],
+                "board_id": 1,
+                "created_by": 1,
+                "updated_by": 1,
+                "created_at": "2024-01-01T10:00:00",
+                "updated_at": "2024-01-15T10:30:00",
+            }
+        },
+    )
+
+    id: int
+    name: str
+    slug: Optional[str] = None
+    content: Any
+    summary: Optional[str] = None
+    category: Optional[str] = None
+    tags: Optional[List[str]] = None
+    board_id: int
+    created_by: Optional[int] = None
+    updated_by: Optional[int] = None
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+
+
+class WikiUpdateRequest(BaseModel):
+    """Schema for updating a wiki"""
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "name": "Updated Security Guidelines",
+                "slug": "updated-security-guidelines",
+                "content": [
+                    {"type": "paragraph", "children": [{"text": "Updated..."}]}
+                ],
+                "summary": "Updated summary",
+                "category": "Updated Category",
+                "tags": ["security", "updated"],
+            }
+        }
+    )
+
+    name: Optional[str] = Field(None, min_length=1, max_length=200)
+    slug: Optional[str] = Field(None, max_length=200)
+    content: Optional[Any] = None
+    summary: Optional[str] = None
+    category: Optional[str] = Field(None, max_length=100)
+    tags: Optional[List[str]] = None
+
+    @field_validator("slug")
+    @classmethod
+    def validate_slug(cls, v):
+        """Validate slug is URL-friendly."""
+        if v and not v.islower():
+            raise ValueError("Slug must be lowercase")
+        if v and not all(c.isalnum() or c == "-" for c in v):
+            raise ValueError(
+                "Slug must contain only lowercase letters, numbers, and hyphens"
+            )
+        return v
+
+
+class WikiEntityLink(BaseModel):
+    """Schema for wiki entity link response"""
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "wiki_id": 1,
+                "entity_type": "card",
+                "entity_id": 5,
+                "created_at": "2024-01-15T10:30:00",
+                "linked_by": 1,
+            }
+        }
+    )
+
+    wiki_id: int
+    entity_type: str
+    entity_id: int
+    created_at: Optional[datetime] = None
+    linked_by: Optional[int] = None
+
+
+class WikiLinkRequest(BaseModel):
+    """Schema for creating a wiki entity link"""
+
+    model_config = ConfigDict(
+        json_schema_extra={
+            "example": {
+                "entity_type": "card",
+                "entity_id": 5,
+            }
+        }
+    )
+
+    entity_type: str = Field(..., description="Entity type (card, epic, list, board)")
+    entity_id: int = Field(..., description="Entity ID")
+
+    @field_validator("entity_type")
+    @classmethod
+    def validate_entity_type(cls, v):
+        """Validate entity type is supported."""
+        valid_types = ["card", "epic", "list", "board"]
+        if v not in valid_types:
+            raise ValueError(f"entity_type must be one of: {', '.join(valid_types)}")
+        return v

backend/app/services/storage/__init__.py

@@ -0,0 +1,20 @@
+"""Storage service module for file upload operations"""
+
+from app.services.storage.attachment_service import AttachmentService
+from app.services.storage.base import StorageAdapter
+from app.services.storage.file_processor import (FileProcessor, ImageProcessor,
+                                                 PDFProcessor)
+from app.services.storage.file_service import FileService
+from app.services.storage.minio_client import MinIOStorageAdapter
+from app.services.storage.storage_extension import storage
+
+__all__ = [
+    "StorageAdapter",
+    "MinIOStorageAdapter",
+    "FileProcessor",
+    "ImageProcessor",
+    "PDFProcessor",
+    "FileService",
+    "AttachmentService",
+    "storage",
+]

backend/app/services/storage/attachment_service.py

@@ -0,0 +1,231 @@
+"""Service for managing file attachments to entities"""
+
+from io import BytesIO
+from typing import List, Optional
+
+from flask import current_app
+
+from app.models import Card, Comment, FileAttachment
+from app.services.storage.file_service import FileService
+
+
+class AttachmentService:
+    """Service for managing file attachments to Cards, Comments, etc."""
+
+    def __init__(self, file_service: Optional[FileService] = None):
+        """
+        Initialize AttachmentService with dependency injection
+
+        Args:
+            file_service: FileService instance
+            (defaults to new instance with dependency injection)
+        """
+        self.file_service = file_service or FileService()
+
+    def attach_file_to_card(
+        self,
+        card_id: int,
+        file_data: BytesIO,
+        filename: str,
+        content_type: str,
+        file_size: int,
+        uploaded_by: int,
+    ) -> FileAttachment:
+        """
+        Attach a file to a card
+
+        Args:
+            card_id: ID of the card
+            file_data: File data as BytesIO
+            filename: Original filename
+            content_type: MIME type
+            file_size: File size in bytes
+            uploaded_by: User ID who uploaded the file
+
+        Returns:
+            FileAttachment: Created attachment record
+        """
+        # Verify card exists
+        card = Card.query.get(card_id)
+        if not card:
+            raise ValueError(f"Card with ID {card_id} not found")
+
+        # Upload file
+        return self.file_service.upload_file(
+            file_data=file_data,
+            filename=filename,
+            content_type=content_type,
+            file_size=file_size,
+            uploaded_by=uploaded_by,
+            attachable_type="Card",
+            attachable_id=card_id,
+        )
+
+    def attach_file_to_comment(
+        self,
+        comment_id: int,
+        file_data: BytesIO,
+        filename: str,
+        content_type: str,
+        file_size: int,
+        uploaded_by: int,
+    ) -> FileAttachment:
+        """
+        Attach a file to a comment
+
+        Args:
+            comment_id: ID of the comment
+            file_data: File data as BytesIO
+            filename: Original filename
+            content_type: MIME type
+            file_size: File size in bytes
+            uploaded_by: User ID who uploaded the file
+
+        Returns:
+            FileAttachment: Created attachment record
+        """
+        # Verify comment exists
+        comment = Comment.query.get(comment_id)
+        if not comment:
+            raise ValueError(f"Comment with ID {comment_id} not found")
+
+        # Upload file
+        return self.file_service.upload_file(
+            file_data=file_data,
+            filename=filename,
+            content_type=content_type,
+            file_size=file_size,
+            uploaded_by=uploaded_by,
+            attachable_type="Comment",
+            attachable_id=comment_id,
+        )
+
+    def attach_file_to_entity(
+        self,
+        entity_type: str,
+        entity_id: int,
+        file_data: BytesIO,
+        filename: str,
+        content_type: str,
+        file_size: int,
+        uploaded_by: int,
+    ) -> FileAttachment:
+        """
+        Attach a file to any entity type
+
+        Args:
+            entity_type: Type of entity (Card, Comment, etc.)
+            entity_id: ID of the entity
+            file_data: File data as BytesIO
+            filename: Original filename
+            content_type: MIME type
+            file_size: File size in bytes
+            uploaded_by: User ID who uploaded the file
+
+        Returns:
+            FileAttachment: Created attachment record
+        """
+        # Validate entity type
+        valid_types = ["Card", "Comment", "Epic", "Board"]
+        if entity_type not in valid_types:
+            raise ValueError(
+                f"Invalid entity type: {entity_type}. Must be one of {valid_types}"
+            )
+
+        # Upload file
+        return self.file_service.upload_file(
+            file_data=file_data,
+            filename=filename,
+            content_type=content_type,
+            file_size=file_size,
+            uploaded_by=uploaded_by,
+            attachable_type=entity_type,
+            attachable_id=entity_id,
+        )
+
+    def get_card_attachments(self, card_id: int) -> List[FileAttachment]:
+        """
+        Get all attachments for a card
+
+        Args:
+            card_id: ID of the card
+
+        Returns:
+            list: List of FileAttachment objects
+        """
+        return self.file_service.get_files_for_entity("Card", card_id)
+
+    def get_comment_attachments(self, comment_id: int) -> List[FileAttachment]:
+        """
+        Get all attachments for a comment
+
+        Args:
+            comment_id: ID of the comment
+
+        Returns:
+            list: List of FileAttachment objects
+        """
+        return self.file_service.get_files_for_entity("Comment", comment_id)
+
+    def get_entity_attachments(
+        self, entity_type: str, entity_id: int
+    ) -> List[FileAttachment]:
+        """
+        Get all attachments for any entity type
+
+        Args:
+            entity_type: Type of entity (Card, Comment, etc.)
+            entity_id: ID of the entity
+
+        Returns:
+            list: List of FileAttachment objects
+        """
+        return self.file_service.get_files_for_entity(entity_type, entity_id)
+
+    def get_attachment_with_url(self, attachment_id: int) -> dict:
+        """
+        Get attachment with download URL
+
+        Args:
+            attachment_id: ID of the attachment
+
+        Returns:
+            dict: Attachment information with URLs
+        """
+        return self.file_service.get_file_info(attachment_id)
+
+    def delete_attachment(self, attachment_id: int) -> bool:
+        """
+        Delete an attachment
+
+        Args:
+            attachment_id: ID of the attachment
+
+        Returns:
+            bool: True if successful
+        """
+        return self.file_service.delete_file(attachment_id)
+
+    def delete_entity_attachments(self, entity_type: str, entity_id: int) -> int:
+        """
+        Delete all attachments for an entity (cascade delete)
+
+        Args:
+            entity_type: Type of entity (Card, Comment, etc.)
+            entity_id: ID of the entity
+
+        Returns:
+            int: Number of attachments deleted
+        """
+        attachments = self.get_entity_attachments(entity_type, entity_id)
+        deleted_count = 0
+
+        for attachment in attachments:
+            if self.delete_attachment(attachment.id):
+                deleted_count += 1
+
+        current_app.logger.info(
+            f"Deleted {deleted_count} attachments for {entity_type} {entity_id}"
+        )
+
+        return deleted_count

backend/app/services/storage/base.py

@@ -0,0 +1,113 @@
+"""Abstract base class for storage adapters"""
+
+from abc import ABC, abstractmethod
+from io import BytesIO
+
+
+class StorageAdapter(ABC):
+    """Abstract base class for storage adapters"""
+
+    @abstractmethod
+    def upload_file(
+        self,
+        file_data: BytesIO,
+        bucket_name: str,
+        object_name: str,
+        content_type: str,
+    ) -> dict:
+        """
+        Upload a file to storage
+
+        Args:
+            file_data: File data as BytesIO
+            bucket_name: Name of the bucket
+            object_name: Name of the object in storage
+            content_type: MIME type of the file
+
+        Returns:
+            dict: Upload result with metadata
+        """
+        pass
+
+    @abstractmethod
+    def download_file(self, bucket_name: str, object_name: str) -> BytesIO:
+        """
+        Download a file from storage
+
+        Args:
+            bucket_name: Name of the bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            BytesIO: File data
+        """
+        pass
+
+    @abstractmethod
+    def delete_file(self, bucket_name: str, object_name: str) -> bool:
+        """
+        Delete a file from storage
+
+        Args:
+            bucket_name: Name of the bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            bool: True if successful
+        """
+        pass
+
+    @abstractmethod
+    def generate_presigned_url(
+        self, bucket_name: str, object_name: str, expires_in: int = 3600
+    ) -> str:
+        """
+        Generate a presigned URL for file access
+
+        Args:
+            bucket_name: Name of the bucket
+            object_name: Name of the object in storage
+            expires_in: URL expiration time in seconds
+
+        Returns:
+            str: Presigned URL
+        """
+        pass
+
+    @abstractmethod
+    def file_exists(self, bucket_name: str, object_name: str) -> bool:
+        """
+        Check if a file exists in storage
+
+        Args:
+            bucket_name: Name of the bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            bool: True if file exists
+        """
+        pass
+
+    @abstractmethod
+    def get_file_info(self, bucket_name: str, object_name: str) -> dict:
+        """
+        Get file metadata
+
+        Args:
+            bucket_name: Name of the bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            dict: File metadata
+        """
+        pass
+
+    @abstractmethod
+    def ensure_bucket_exists(self, bucket_name: str) -> None:
+        """
+        Ensure a bucket exists, create if it doesn't
+
+        Args:
+            bucket_name: Name of the bucket
+        """
+        pass

backend/app/services/storage/file_processor.py

@@ -0,0 +1,264 @@
+"""File processor classes for different file types"""
+
+from abc import ABC, abstractmethod
+from io import BytesIO
+from typing import Optional, Tuple
+
+from flask import current_app
+from PIL import Image
+
+
+class FileProcessor(ABC):
+    """Abstract base class for file processors"""
+
+    @abstractmethod
+    def validate(self, file_data: BytesIO, file_size: int, mime_type: str) -> bool:
+        """
+        Validate file
+
+        Args:
+            file_data: File data as BytesIO
+            file_size: Size of the file in bytes
+            mime_type: MIME type of the file
+
+        Returns:
+            bool: True if valid
+        """
+        pass
+
+    @abstractmethod
+    def process(self, file_data: BytesIO, mime_type: str) -> dict:
+        """
+        Process file and return metadata
+
+        Args:
+            file_data: File data as BytesIO
+            mime_type: MIME type of the file
+
+        Returns:
+            dict: Processing results and metadata
+        """
+        pass
+
+    @abstractmethod
+    def get_file_type(self) -> str:
+        """Return the file type (image, pdf, document, etc.)"""
+        pass
+
+
+class ImageProcessor(FileProcessor):
+    """Processor for image files"""
+
+    def __init__(self):
+        self.supported_formats = {
+            "image/jpeg": "jpeg",
+            "image/png": "png",
+            "image/gif": "gif",
+            "image/webp": "webp",
+            "image/svg+xml": "svg+xml",
+        }
+
+    def validate(self, file_data: BytesIO, file_size: int, mime_type: str) -> bool:
+        """Validate image file"""
+        # Check file size
+        if file_size > current_app.config["MAX_UPLOAD_SIZE_IMAGE"]:
+            current_app.logger.error(
+                f"Image size {file_size} exceeds "
+                + "maximum {current_app.config['MAX_UPLOAD_SIZE_IMAGE']}"
+            )
+            return False
+
+        # Check MIME type
+        if mime_type not in current_app.config["ALLOWED_IMAGE_TYPES"]:
+            current_app.logger.error(f"Unsupported image MIME type: {mime_type}")
+            return False
+
+        # Verify it's actually an image
+        try:
+            file_data.seek(0)
+            img = Image.open(file_data)
+            img.verify()
+            file_data.seek(0)
+            return True
+        except Exception as e:
+            current_app.logger.error(f"Image validation failed: {e}")
+            return False
+
+    def process(self, file_data: BytesIO, mime_type: str) -> dict:
+        """Process image and extract metadata"""
+        file_data.seek(0)
+        img = Image.open(file_data)
+
+        metadata = {
+            "width": img.width,
+            "height": img.height,
+            "format": img.format,
+            "mode": img.mode,
+            "file_type": "image",
+        }
+
+        # Generate thumbnail
+        thumbnail_data = self._generate_thumbnail(img)
+
+        file_data.seek(0)
+        return {
+            "metadata": metadata,
+            "thumbnail_data": thumbnail_data,
+        }
+
+    def _generate_thumbnail(
+        self, img: Image.Image, size: Tuple[int, int] = (200, 200)
+    ) -> Optional[BytesIO]:
+        """
+        Generate thumbnail for image
+
+        Args:
+            img: PIL Image object
+            size: Thumbnail size (width, height)
+
+        Returns:
+            BytesIO: Thumbnail data or None
+        """
+        try:
+            # Create thumbnail
+            img_copy = img.copy()
+            img_copy.thumbnail(size, Image.Resampling.LANCZOS)
+
+            # Convert RGBA to RGB if necessary (JPEG doesn't support transparency)
+            if img_copy.mode in ("RGBA", "LA", "P"):
+                # Create white background
+                background = Image.new("RGB", img_copy.size, (255, 255, 255))
+                if img_copy.mode == "P":
+                    img_copy = img_copy.convert("RGBA")
+                if img_copy.mode in ("RGBA", "LA"):
+                    background.paste(img_copy, mask=img_copy.split()[-1])
+                else:
+                    background.paste(img_copy)
+                img_copy = background
+            elif img_copy.mode != "RGB":
+                img_copy = img_copy.convert("RGB")
+
+            # Save to BytesIO
+            thumb_data = BytesIO()
+            img_copy.save(thumb_data, format="JPEG", quality=85)
+            thumb_data.seek(0)
+
+            return thumb_data
+        except Exception as e:
+            current_app.logger.error(f"Thumbnail generation failed: {e}")
+            return None
+
+    def get_file_type(self) -> str:
+        return "image"
+
+
+class PDFProcessor(FileProcessor):
+    """Processor for PDF files"""
+
+    def validate(self, file_data: BytesIO, file_size: int, mime_type: str) -> bool:
+        """Validate PDF file"""
+        # Check file size
+        if file_size > current_app.config["MAX_UPLOAD_SIZE_DOCUMENT"]:
+            current_app.logger.error(
+                f"PDF size {file_size} exceeds "
+                f"maximum {current_app.config['MAX_UPLOAD_SIZE_DOCUMENT']}"
+            )
+            return False
+
+        # Check MIME type
+        if mime_type not in current_app.config["ALLOWED_DOCUMENT_TYPES"]:
+            current_app.logger.error(f"Unsupported document MIME type: {mime_type}")
+            return False
+
+        # Verify it's actually a PDF
+        try:
+            file_data.seek(0)
+            header = file_data.read(4)
+            file_data.seek(0)
+            if header != b"%PDF":
+                current_app.logger.error("Invalid PDF header")
+                return False
+            return True
+        except Exception as e:
+            current_app.logger.error(f"PDF validation failed: {e}")
+            return False
+
+    def process(self, file_data: BytesIO, mime_type: str) -> dict:
+        """Process PDF and extract metadata"""
+        file_data.seek(0)
+
+        # Basic PDF metadata extraction
+        # Note: For more detailed extraction, you might want to use PyPDF2 or similar
+        metadata = {
+            "file_type": "pdf",
+        }
+
+        return {
+            "metadata": metadata,
+            "thumbnail_data": None,  # PDFs don't have thumbnails by default
+        }
+
+    def get_file_type(self) -> str:
+        return "pdf"
+
+
+class DocumentProcessor(FileProcessor):
+    """Processor for other document types (placeholder for future expansion)"""
+
+    def validate(self, file_data: BytesIO, file_size: int, mime_type: str) -> bool:
+        """Validate document file"""
+        # Basic validation - can be extended for specific document types
+        if file_size > current_app.config["MAX_UPLOAD_SIZE_DOCUMENT"]:
+            current_app.logger.error("Document size exceeds maximum")
+            return False
+        return True
+
+    def process(self, file_data: BytesIO, mime_type: str) -> dict:
+        """Process document"""
+        return {
+            "metadata": {"file_type": "document"},
+            "thumbnail_data": None,
+        }
+
+    def get_file_type(self) -> str:
+        return "document"
+
+
+class ProcessorFactory:
+    """Factory for creating appropriate file processors"""
+
+    @staticmethod
+    def get_processor(mime_type: str) -> FileProcessor:
+        """
+        Get appropriate processor for MIME type
+
+        Args:
+            mime_type: MIME type of the file
+
+        Returns:
+            FileProcessor: Appropriate processor instance
+        """
+        if mime_type.startswith("image/"):
+            return ImageProcessor()
+        elif mime_type == "application/pdf":
+            return PDFProcessor()
+        else:
+            return DocumentProcessor()
+
+    @staticmethod
+    def get_file_type_from_mime(mime_type: str) -> str:
+        """
+        Get file type category from MIME type
+
+        Args:
+            mime_type: MIME type of the file
+
+        Returns:
+            str: File type category
+        """
+        if mime_type.startswith("image/"):
+            return "image"
+        elif mime_type == "application/pdf":
+            return "pdf"
+        else:
+            return "document"

backend/app/services/storage/file_service.py

@@ -0,0 +1,315 @@
+"""Main file service for handling file uploads"""
+
+from io import BytesIO
+from typing import Any, Dict, Optional
+
+from flask import current_app
+
+from app import db
+from app.models import FileAttachment
+from app.services.storage.base import StorageAdapter
+from app.services.storage.file_processor import ProcessorFactory
+
+
+class FileService:
+    """Service for handling file upload and storage operations"""
+
+    def __init__(self, storage_adapter: Optional[StorageAdapter] = None):
+        """
+        Initialize FileService with dependency injection
+
+        Args:
+            storage_adapter: Storage adapter
+            (optional, defaults to factory-provided adapter)
+        """
+        if storage_adapter:
+            self.storage = storage_adapter
+        else:
+            from app.services.storage.storage_factory import StorageFactory
+
+            self.storage = StorageFactory.get_storage()
+
+    def upload_file(
+        self,
+        file_data: BytesIO,
+        filename: str,
+        content_type: str,
+        file_size: int,
+        uploaded_by: int,
+        attachable_type: str,
+        attachable_id: int,
+    ) -> FileAttachment:
+        """
+        Upload a file and create FileAttachment record
+
+        Args:
+            file_data: File data as BytesIO
+            filename: Original filename
+            content_type: MIME type
+            file_size: File size in bytes
+            uploaded_by: User ID who uploaded the file
+            attachable_type: Type of entity (Card, Comment, etc.)
+            attachable_id: ID of the entity
+
+        Returns:
+            FileAttachment: Created attachment record
+        """
+        # Get appropriate processor
+        processor = ProcessorFactory.get_processor(content_type)
+
+        # Validate file
+        if not processor.validate(file_data, file_size, content_type):
+            raise ValueError("File validation failed")
+
+        # Process file and get metadata (this also generates thumbnail)
+        file_data.seek(0)  # Ensure file is at start
+        process_result = processor.process(file_data, content_type)
+        metadata = process_result["metadata"]
+        thumbnail_data = process_result["thumbnail_data"]
+
+        # Seek back to start for main file upload
+        file_data.seek(0)
+
+        # Determine bucket
+        bucket_name = self._get_bucket_for_type(content_type)
+
+        # Generate unique object name
+        object_name = self.storage.generate_unique_object_name(filename)
+
+        # Upload main file
+        self.storage.upload_file(
+            file_data, bucket_name, object_name, content_type, file_size
+        )
+
+        # Upload thumbnail if available
+        thumbnail_info = {}
+        if thumbnail_data:
+            try:
+                thumb_bucket = current_app.config["MINIO_THUMBNAILS_BUCKET"]
+                thumb_object_name = f"thumb_{object_name}"
+
+                # Get thumbnail length
+                thumbnail_data.seek(0, 2)
+                thumb_length = thumbnail_data.tell()
+                thumbnail_data.seek(0)
+
+                # Upload thumbnail
+                self.storage.upload_file(
+                    thumbnail_data,
+                    thumb_bucket,
+                    thumb_object_name,
+                    "image/jpeg",
+                    length=thumb_length,
+                )
+
+                thumbnail_info = {
+                    "thumbnail_minio_object_name": thumb_object_name,
+                    "thumbnail_minio_bucket": thumb_bucket,
+                }
+
+                current_app.logger.info(
+                    f"Thumbnail uploaded: {thumb_bucket}/{thumb_object_name}"
+                )
+            except Exception as e:
+                current_app.logger.error(f"Failed to upload thumbnail: {e}")
+                # Continue without thumbnail
+
+        # Create database record
+        attachment = FileAttachment(
+            filename=object_name,
+            original_name=filename,
+            file_type=metadata.get("file_type", "document"),
+            mime_type=content_type,
+            file_size=file_size,
+            minio_bucket=bucket_name,
+            minio_object_name=object_name,
+            uploaded_by=uploaded_by,
+            attachable_type=attachable_type,
+            attachable_id=attachable_id,
+            **thumbnail_info,
+        )
+
+        db.session.add(attachment)
+        db.session.commit()
+
+        current_app.logger.info(
+            f"File uploaded: {filename} -> {bucket_name}/{object_name}"
+        )
+
+        return attachment
+
+    def delete_file(self, attachment_id: int) -> bool:
+        """
+        Delete a file and its attachment record
+
+        Args:
+            attachment_id: ID of the FileAttachment
+
+        Returns:
+            bool: True if successful
+        """
+        attachment = db.session.get(FileAttachment, attachment_id)
+        if not attachment:
+            return False
+
+        # Delete from MinIO
+        try:
+            self.storage.delete_file(
+                attachment.minio_bucket, attachment.minio_object_name
+            )
+
+            # Delete thumbnail if exists
+            if (
+                attachment.thumbnail_minio_bucket
+                and attachment.thumbnail_minio_object_name
+            ):
+                self.storage.delete_file(
+                    attachment.thumbnail_minio_bucket,
+                    attachment.thumbnail_minio_object_name,
+                )
+        except Exception as e:
+            current_app.logger.error(f"Error deleting file from MinIO: {e}")
+
+        # Delete from database
+        db.session.delete(attachment)
+        db.session.commit()
+
+        current_app.logger.info(f"File deleted: {attachment.original_name}")
+        return True
+
+    def get_file_url(self, attachment_id: int, expires_in: int = 3600) -> str:
+        """
+        Generate a presigned URL for file access
+
+        Args:
+            attachment_id: ID of the FileAttachment
+            expires_in: URL expiration time in seconds
+
+        Returns:
+            str: Presigned URL
+        """
+        attachment = db.session.get(FileAttachment, attachment_id)
+        if not attachment:
+            raise ValueError("Attachment not found")
+
+        return self.storage.generate_presigned_url(
+            attachment.minio_bucket,
+            attachment.minio_object_name,
+            expires_in,
+        )
+
+    def get_thumbnail_url(
+        self, attachment_id: int, expires_in: int = 3600
+    ) -> Optional[str]:
+        """
+        Generate a presigned URL for thumbnail access
+
+        Args:
+            attachment_id: ID of the FileAttachment
+            expires_in: URL expiration time in seconds
+
+        Returns:
+            str: Presigned URL or None if no thumbnail
+        """
+        attachment = db.session.get(FileAttachment, attachment_id)
+        if not attachment or not attachment.thumbnail_minio_bucket:
+            return None
+
+        return self.storage.generate_presigned_url(
+            attachment.thumbnail_minio_bucket,
+            attachment.thumbnail_minio_object_name,
+            expires_in,
+        )
+
+    def _get_bucket_for_type(self, mime_type: str) -> str:
+        """
+        Get appropriate bucket for MIME type
+
+        Args:
+            mime_type: MIME type of the file
+
+        Returns:
+            str: Bucket name
+        """
+        if mime_type.startswith("image/"):
+            return current_app.config["MINIO_IMAGES_BUCKET"]
+        elif mime_type == "application/pdf":
+            return current_app.config["MINIO_DOCUMENTS_BUCKET"]
+        else:
+            return current_app.config["MINIO_DOCUMENTS_BUCKET"]
+
+    def get_file_by_id(self, attachment_id: int) -> Optional[FileAttachment]:
+        """
+        Get file attachment by ID
+
+        Args:
+            attachment_id: ID of the FileAttachment
+
+        Returns:
+            FileAttachment or None
+        """
+        return db.session.get(FileAttachment, attachment_id)
+
+    def get_files_for_entity(
+        self, attachable_type: str, attachable_id: int
+    ) -> list[FileAttachment]:
+        """
+        Get all files attached to an entity
+
+        Args:
+            attachable_type: Type of entity (Card, Comment, etc.)
+            attachable_id: ID of the entity
+
+        Returns:
+            list: List of FileAttachment objects
+        """
+        return FileAttachment.query.filter_by(
+            attachable_type=attachable_type, attachable_id=attachable_id
+        ).all()
+
+    def get_file_info(self, attachment_id: int) -> Optional[Dict[str, Any]]:
+        """
+        Get file information including UUID-based secure URLs
+
+        Security: Only exposes public-facing information.
+        Internal details (MinIO paths, IDs, entity references) are hidden.
+
+        Uses UUID for secure file access:
+        - UUIDs are non-sequential and hard to guess
+        - All endpoints require JWT authentication
+        - MinIO server stays hidden from public
+        - Frontend uses blob URLs for secure image display
+
+        Args:
+            attachment_id: ID of the FileAttachment
+
+        Returns:
+            dict: File information with UUID-based URLs
+        """
+        attachment = self.get_file_by_id(attachment_id)
+        if not attachment:
+            return None
+
+        # Use UUID-based secure URLs (all require JWT authentication)
+        download_url = f"/files/{attachment.uuid}/download"
+        thumbnail_url = (
+            f"/files/{attachment.uuid}/thumbnail"
+            if attachment.thumbnail_minio_object_name
+            else None
+        )
+        view_url = f"/files/{attachment.uuid}/view"
+
+        # Only return public-facing fields (security: hide internal implementation)
+        return {
+            "uuid": attachment.uuid,
+            "original_name": attachment.original_name,
+            "file_type": attachment.file_type,
+            "file_size": attachment.file_size,
+            "mime_type": attachment.mime_type,
+            "created_at": attachment.created_at.isoformat()
+            if attachment.created_at
+            else None,
+            "download_url": download_url,
+            "thumbnail_url": thumbnail_url,
+            "view_url": view_url,
+        }

backend/app/services/storage/minio_client.py

@@ -0,0 +1,222 @@
+"""MinIO storage adapter implementation"""
+
+import uuid
+from io import BytesIO
+from typing import Optional
+
+from flask import current_app
+from minio import Minio
+from minio.error import S3Error
+
+from app.services.storage.base import StorageAdapter
+
+
+class MinIOStorageAdapter(StorageAdapter):
+    """MinIO implementation of StorageAdapter"""
+
+    def __init__(self, minio_client: Optional[Minio] = None):
+        """
+        Initialize MinIO adapter with client dependency
+
+        Args:
+            minio_client: MinIO client
+            instance (optional, defaults to extension's client)
+        """
+        if minio_client is not None:
+            self.client = minio_client
+        else:
+            # Get client from storage extension (dependency injection)
+            from app.services.storage.storage_extension import storage
+
+            self.client = storage.get_client()
+
+    def upload_file(
+        self,
+        file_data: BytesIO,
+        bucket_name: str,
+        object_name: str,
+        content_type: str,
+        length: Optional[int] = None,
+    ) -> dict:
+        """
+        Upload a file to MinIO
+
+        Args:
+            file_data: File data as BytesIO
+            bucket_name: Name of bucket
+            object_name: Name of the object in MinIO
+            content_type: MIME type of the file
+            length: File size in bytes (optional, will be determined if not provided)
+
+        Returns:
+            dict: Upload result with metadata
+        """
+        try:
+            # Get file length if not provided
+            if length is None:
+                file_data.seek(0, 2)  # Seek to end
+                length = file_data.tell()
+                file_data.seek(0)  # Seek back to start
+
+            # Ensure bucket exists
+            self.ensure_bucket_exists(bucket_name)
+
+            # Upload file
+            result = self.client.put_object(
+                bucket_name,
+                object_name,
+                file_data,
+                length=length,
+                content_type=content_type,
+            )
+
+            return {
+                "success": True,
+                "bucket": bucket_name,
+                "object_name": object_name,
+                "size": length,
+                "etag": result.etag,
+                "version_id": result.version_id
+                if hasattr(result, "version_id")
+                else None,
+            }
+        except S3Error as e:
+            current_app.logger.error(f"MinIO upload error: {e}")
+            raise
+
+    def download_file(self, bucket_name: str, object_name: str) -> BytesIO:
+        """
+        Download a file from MinIO
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in MinIO
+
+        Returns:
+            BytesIO: File data
+        """
+        try:
+            response = self.client.get_object(bucket_name, object_name)
+            return BytesIO(response.read())
+        except S3Error as e:
+            current_app.logger.error(f"MinIO download error: {e}")
+            raise
+
+    def delete_file(self, bucket_name: str, object_name: str) -> bool:
+        """
+        Delete a file from MinIO
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in MinIO
+
+        Returns:
+            bool: True if successful
+        """
+        try:
+            self.client.remove_object(bucket_name, object_name)
+            return True
+        except S3Error as e:
+            current_app.logger.error(f"MinIO delete error: {e}")
+            return False
+
+    def generate_presigned_url(
+        self, bucket_name: str, object_name: str, expires_in: int = 3600
+    ) -> str:
+        """
+        Generate a presigned URL for file access
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in MinIO
+            expires_in: URL expiration time in seconds
+
+        Returns:
+            str: Presigned URL
+        """
+        try:
+            url = self.client.presigned_get_object(
+                bucket_name, object_name, expires=expires_in
+            )
+            return url
+        except S3Error as e:
+            current_app.logger.error(f"MinIO presigned URL error: {e}")
+            raise
+
+    def file_exists(self, bucket_name: str, object_name: str) -> bool:
+        """
+        Check if a file exists in MinIO
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in MinIO
+
+        Returns:
+            bool: True if file exists
+        """
+        try:
+            self.client.stat_object(bucket_name, object_name)
+            return True
+        except S3Error as e:
+            if e.code == "NoSuchKey":
+                return False
+            current_app.logger.error(f"MinIO check exists error: {e}")
+            return False
+
+    def get_file_info(self, bucket_name: str, object_name: str) -> dict:
+        """
+        Get file metadata from MinIO
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in MinIO
+
+        Returns:
+            dict: File metadata
+        """
+        try:
+            stat = self.client.stat_object(bucket_name, object_name)
+            return {
+                "size": stat.size,
+                "last_modified": stat.last_modified,
+                "etag": stat.etag,
+                "content_type": stat.content_type,
+            }
+        except S3Error as e:
+            current_app.logger.error(f"MinIO get file info error: {e}")
+            raise
+
+    def ensure_bucket_exists(self, bucket_name: str) -> None:
+        """
+        Ensure a bucket exists, create if it doesn't
+
+        Args:
+            bucket_name: Name of the bucket
+        """
+        try:
+            if not self.client.bucket_exists(bucket_name):
+                self.client.make_bucket(bucket_name)
+                current_app.logger.info(f"Created bucket: {bucket_name}")
+        except S3Error as e:
+            current_app.logger.error(f"MinIO ensure bucket error: {e}")
+            raise
+
+    def generate_unique_object_name(self, original_filename: str) -> str:
+        """
+        Generate a unique object name for a file
+
+        Args:
+            original_filename: Original filename
+
+        Returns:
+            str: Unique object name
+        """
+        # Extract file extension
+        ext = (
+            original_filename.rsplit(".", 1)[1].lower()
+            if "." in original_filename
+            else ""
+        )
+        # Generate unique filename with UUID
+        unique_name = f"{uuid.uuid4().hex}"
+        return f"{unique_name}.{ext}" if ext else unique_name

backend/app/services/storage/mock_adapter.py

@@ -0,0 +1,217 @@
+"""Mock storage adapter for testing (in-memory storage)"""
+
+import uuid
+from datetime import datetime, timezone
+from io import BytesIO
+
+from app.services.storage.base import StorageAdapter
+
+
+class MockStorageAdapter(StorageAdapter):
+    """In-memory storage adapter for testing purposes"""
+
+    # Class-level storage to persist across instances
+    _files = {}  # {(bucket, object_name): BytesIO}
+    _file_info = {}  # {(bucket, object_name): metadata}
+    _buckets = set()  # Track created buckets
+
+    def __init__(self):
+        """Initialize mock storage (storage is shared at class level)"""
+        pass
+
+    def upload_file(
+        self,
+        file_data: BytesIO,
+        bucket_name: str,
+        object_name: str,
+        content_type: str,
+        length: int = None,
+    ) -> dict:
+        """
+        Upload a file to in-memory storage
+
+        Args:
+            file_data: File data as BytesIO
+            bucket_name: Name of bucket
+            object_name: Name of object in storage
+            content_type: MIME type of file
+            length: File size in bytes (optional)
+
+        Returns:
+            dict: Upload result with metadata
+        """
+        # Ensure bucket exists
+        self.ensure_bucket_exists(bucket_name)
+
+        # Get file length if not provided
+        if length is None:
+            file_data.seek(0, 2)  # Seek to end
+            length = file_data.tell()
+            file_data.seek(0)  # Seek back to start
+
+        # Store file data (create a copy to avoid reference issues)
+        file_data.seek(0)
+        file_copy = BytesIO(file_data.read())
+
+        # Store in memory
+        key = (bucket_name, object_name)
+        self._files[key] = file_copy
+
+        # Store metadata
+        metadata = {
+            "size": length,
+            "content_type": content_type,
+            "last_modified": datetime.now(timezone.utc),
+            "etag": uuid.uuid4().hex,
+        }
+        self._file_info[key] = metadata
+
+        return {
+            "success": True,
+            "bucket": bucket_name,
+            "object_name": object_name,
+            "size": length,
+            "etag": metadata["etag"],
+        }
+
+    def download_file(self, bucket_name: str, object_name: str) -> BytesIO:
+        """
+        Download a file from in-memory storage
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            BytesIO: File data
+
+        Raises:
+            ValueError: If file doesn't exist
+        """
+        key = (bucket_name, object_name)
+        if key not in self._files:
+            raise ValueError(f"File {bucket_name}/{object_name} not found")
+
+        # Create a copy to avoid modifying the original
+        self._files[key].seek(0)
+        return BytesIO(self._files[key].read())
+
+    def delete_file(self, bucket_name: str, object_name: str) -> bool:
+        """
+        Delete a file from in-memory storage
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            bool: True if successful, False if file doesn't exist
+        """
+        key = (bucket_name, object_name)
+        if key not in self._files:
+            return False
+
+        # Remove from storage
+        del self._files[key]
+        del self._file_info[key]
+
+        return True
+
+    def generate_presigned_url(
+        self, bucket_name: str, object_name: str, expires_in: int = 3600
+    ) -> str:
+        """
+        Generate a mock presigned URL
+
+        In tests, this returns a fake URL that looks like a real MinIO URL
+        but doesn't actually need to work since we use Flask proxy routes.
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in storage
+            expires_in: URL expiration time in seconds (ignored in mock)
+
+        Returns:
+            str: Mock presigned URL
+        """
+        return f"http://minio:9000/{bucket_name}/{object_name}?X-Amz-Token=mock"
+
+    def file_exists(self, bucket_name: str, object_name: str) -> bool:
+        """
+        Check if a file exists in in-memory storage
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            bool: True if file exists
+        """
+        return (bucket_name, object_name) in self._files
+
+    def get_file_info(self, bucket_name: str, object_name: str) -> dict:
+        """
+        Get file metadata from in-memory storage
+
+        Args:
+            bucket_name: Name of bucket
+            object_name: Name of the object in storage
+
+        Returns:
+            dict: File metadata
+
+        Raises:
+            ValueError: If file doesn't exist
+        """
+        key = (bucket_name, object_name)
+        if key not in self._file_info:
+            raise ValueError(f"File {bucket_name}/{object_name} not found")
+
+        return self._file_info[key].copy()
+
+    def ensure_bucket_exists(self, bucket_name: str) -> None:
+        """
+        Ensure a bucket exists, create if it doesn't
+
+        Args:
+            bucket_name: Name of bucket
+        """
+        if bucket_name not in self._buckets:
+            self._buckets.add(bucket_name)
+
+    def generate_unique_object_name(self, original_filename: str) -> str:
+        """
+        Generate a unique object name for a file
+
+        Args:
+            original_filename: Original filename
+
+        Returns:
+            str: Unique object name
+        """
+        # Extract file extension
+        ext = (
+            original_filename.rsplit(".", 1)[1].lower()
+            if "." in original_filename
+            else ""
+        )
+        # Generate unique filename with UUID
+        unique_name = f"{uuid.uuid4().hex}"
+        return f"{unique_name}.{ext}" if ext else unique_name
+
+    @classmethod
+    def clear_all(cls) -> None:
+        """Clear all files and buckets (useful for test cleanup)"""
+        cls._files.clear()
+        cls._file_info.clear()
+        cls._buckets.clear()
+
+    @classmethod
+    def get_all_files(cls) -> list:
+        """
+        Get all stored files (useful for test assertions)
+
+        Returns:
+            list: List of (bucket, object_name) tuples
+        """
+        return list(cls._files.keys())

backend/app/services/storage/storage_extension.py

@@ -0,0 +1,128 @@
+"""Flask extension for MinIO storage client initialization"""
+
+import logging
+
+from flask import Flask
+from minio import Minio
+from minio.error import S3Error
+
+
+class StorageExtension:
+    """Flask extension for managing MinIO storage client"""
+
+    def __init__(self, app: Flask = None):
+        """
+        Initialize StorageExtension
+
+        Args:
+            app: Flask application instance (optional)
+        """
+        self.app = app
+        self.client = None
+        self.logger = logging.getLogger(__name__)
+        if app is not None:
+            self.init_app(app)
+
+    def init_app(self, app: Flask) -> None:
+        """
+        Initialize the extension with Flask app
+
+        Args:
+            app: Flask application instance
+        """
+        # Store extension on app
+        app.extensions = getattr(app, "extensions", {})
+        app.extensions["storage"] = self
+
+        # Store app reference for later use
+        self.app = app
+
+        # Initialize and validate MinIO client immediately at app startup
+        self._initialize_and_validate(app)
+
+    def _initialize_and_validate(self, app: Flask) -> None:
+        """
+        Initialize MinIO client and validate connection
+
+        Args:
+            app: Flask application instance
+        """
+        try:
+            # Create MinIO client
+            self.client = Minio(
+                app.config["MINIO_ENDPOINT"],
+                access_key=app.config["MINIO_ACCESS_KEY"],
+                secret_key=app.config["MINIO_SECRET_KEY"],
+                secure=app.config["MINIO_USE_SSL"],
+            )
+
+            # Validate connection by listing buckets
+            self.client.list_buckets()
+            app.logger.info("MinIO client initialized and validated successfully")
+
+            # Ensure all required buckets exist
+            self._ensure_all_buckets_exist(app)
+
+        except S3Error as e:
+            app.logger.error(f"Failed to initialize MinIO client: {e}")
+            raise RuntimeError(
+                f"Failed to connect to MinIO at {app.config['MINIO_ENDPOINT']}. "
+                "Please check your MINIO_ENDPOINT, MINIO_ACCESS_KEY, "
+                "and MINIO_SECRET_KEY configuration."
+            ) from e
+        except KeyError as e:
+            app.logger.error(f"Missing MinIO configuration: {e}")
+            raise RuntimeError(
+                f"Missing required MinIO configuration: {e}. "
+                "Please ensure MINIO_ENDPOINT, MINIO_ACCESS_KEY, "
+                "MINIO_SECRET_KEY are set."
+            ) from e
+
+    def _ensure_all_buckets_exist(self, app: Flask) -> None:
+        """
+        Ensure all required buckets exist
+        Creates buckets if they don't exist
+
+        Args:
+            app: Flask application instance
+        """
+        buckets = [
+            app.config["MINIO_IMAGES_BUCKET"],
+            app.config["MINIO_DOCUMENTS_BUCKET"],
+            app.config["MINIO_THUMBNAILS_BUCKET"],
+        ]
+
+        for bucket_name in buckets:
+            try:
+                if not self.client.bucket_exists(bucket_name):
+                    self.client.make_bucket(bucket_name)
+                    app.logger.info(f"Created MinIO bucket: {bucket_name}")
+                else:
+                    app.logger.debug(f"MinIO bucket already exists: {bucket_name}")
+            except S3Error as e:
+                app.logger.error(f"Failed to ensure bucket {bucket_name}: {e}")
+                raise RuntimeError(
+                    f"Failed to create MinIO bucket '{bucket_name}': {e}"
+                ) from e
+
+    def get_client(self) -> Minio:
+        """
+        Get the MinIO client instance
+
+        Returns:
+            Minio: Initialized MinIO client
+
+        Raises:
+            RuntimeError: If client has not been initialized
+        """
+        if self.client is None:
+            raise RuntimeError(
+                "MinIO client has not been initialized. "
+                "Ensure the Flask app context is active "
+                "and before_first_request has run."
+            )
+        return self.client
+
+
+# Create a singleton instance
+storage = StorageExtension()

backend/app/services/storage/storage_factory.py

@@ -0,0 +1,56 @@
+"""Storage factory for creating storage adapters"""
+
+from flask import current_app
+
+
+class StorageFactory:
+    """Factory for creating storage adapter instances"""
+
+    @staticmethod
+    def get_storage():
+        """
+        Get the appropriate storage adapter based on configuration
+
+        Returns:
+            StorageAdapter: Configured storage adapter instance
+
+        Factory Pattern Benefits:
+        - Centralized adapter selection logic
+        - Easy to add new storage types (S3, GCS, etc.)
+        - Single Responsibility Principle - FileService only handles file operations
+        - Easy to test by injecting mock adapters
+        """
+        # Check if we should use mock storage
+        if current_app.config.get("USE_MOCK_STORAGE", False):
+            from app.services.storage.mock_adapter import MockStorageAdapter
+
+            return MockStorageAdapter()
+
+        # Default to MinIO for production/development
+        from app.services.storage.minio_client import MinIOStorageAdapter
+
+        return MinIOStorageAdapter()
+
+    @staticmethod
+    def get_storage_for_testing():
+        """
+        Get mock storage adapter explicitly for testing
+
+        Returns:
+            StorageAdapter: MockStorageAdapter instance
+        """
+        from app.services.storage.mock_adapter import MockStorageAdapter
+
+        return MockStorageAdapter()
+
+    @staticmethod
+    def get_minio_storage():
+        """
+        Get MinIO storage adapter explicitly
+
+        Returns:
+            StorageAdapter: MinIOStorageAdapter instance
+        """
+        from app.services.storage.minio_client import MinIOStorageAdapter
+
+        return MinIOStorageAdapter()

backend/migrations/versions/6fc439155ced_add_epic_and_wiki_models.py

@@ -0,0 +1,106 @@
+"""add epic and wiki models
+
+Revision ID: 6fc439155ced
+Revises: e9515e29ef8b
+Create Date: 2026-03-22 00:24:26.645867
+
+"""
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = '6fc439155ced'
+down_revision = 'e9515e29ef8b'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('epics',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=200), nullable=False),
+    sa.Column('description', sa.Text(), nullable=True),
+    sa.Column('content', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.Column('color', sa.String(length=7), nullable=True),
+    sa.Column('closed', sa.Boolean(), nullable=True),
+    sa.Column('pos', sa.Float(), nullable=True),
+    sa.Column('depth_limit', sa.Integer(), nullable=True),
+    sa.Column('board_id', sa.Integer(), nullable=False),
+    sa.Column('parent_epic_id', sa.Integer(), nullable=True),
+    sa.Column('date_last_activity', sa.DateTime(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), nullable=True),
+    sa.Column('metrics', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.ForeignKeyConstraint(['board_id'], ['boards.id'], ondelete='CASCADE'),
+    sa.ForeignKeyConstraint(['parent_epic_id'], ['epics.id'], ondelete='SET NULL'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    with op.batch_alter_table('epics', schema=None) as batch_op:
+        batch_op.create_index(batch_op.f('ix_epics_board_id'), ['board_id'], unique=False)
+        batch_op.create_index(batch_op.f('ix_epics_closed'), ['closed'], unique=False)
+        batch_op.create_index(batch_op.f('ix_epics_name'), ['name'], unique=False)
+
+    op.create_table('wikis',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('name', sa.String(length=200), nullable=False),
+    sa.Column('slug', sa.String(length=255), nullable=True),
+    sa.Column('content', postgresql.JSONB(astext_type=sa.Text()), nullable=False),
+    sa.Column('summary', sa.Text(), nullable=True),
+    sa.Column('category', sa.String(length=100), nullable=True),
+    sa.Column('board_id', sa.Integer(), nullable=False),
+    sa.Column('created_by', sa.Integer(), nullable=True),
+    sa.Column('updated_by', sa.Integer(), nullable=True),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('updated_at', sa.DateTime(), nullable=True),
+    sa.Column('tags', postgresql.JSONB(astext_type=sa.Text()), nullable=True),
+    sa.ForeignKeyConstraint(['board_id'], ['boards.id'], ondelete='CASCADE'),
+    sa.ForeignKeyConstraint(['created_by'], ['users.id'], ondelete='SET NULL'),
+    sa.ForeignKeyConstraint(['updated_by'], ['users.id'], ondelete='SET NULL'),
+    sa.PrimaryKeyConstraint('id')
+    )
+    with op.batch_alter_table('wikis', schema=None) as batch_op:
+        batch_op.create_index(batch_op.f('ix_wikis_board_id'), ['board_id'], unique=False)
+        batch_op.create_index(batch_op.f('ix_wikis_name'), ['name'], unique=False)
+        batch_op.create_index(batch_op.f('ix_wikis_slug'), ['slug'], unique=False)
+
+    op.create_table('wiki_entity_links',
+    sa.Column('wiki_id', sa.Integer(), nullable=False),
+    sa.Column('entity_type', sa.String(length=50), nullable=False),
+    sa.Column('entity_id', sa.Integer(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.Column('linked_by', sa.Integer(), nullable=True),
+    sa.ForeignKeyConstraint(['linked_by'], ['users.id'], ondelete='SET NULL'),
+    sa.ForeignKeyConstraint(['wiki_id'], ['wikis.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('wiki_id')
+    )
+    with op.batch_alter_table('cards', schema=None) as batch_op:
+        batch_op.add_column(sa.Column('epic_id', sa.Integer(), nullable=True))
+        batch_op.create_index(batch_op.f('ix_cards_epic_id'), ['epic_id'], unique=False)
+        batch_op.create_foreign_key(None, 'epics', ['epic_id'], ['id'], ondelete='SET NULL')
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('cards', schema=None) as batch_op:
+        batch_op.drop_constraint(None, type_='foreignkey')
+        batch_op.drop_index(batch_op.f('ix_cards_epic_id'))
+        batch_op.drop_column('epic_id')
+
+    op.drop_table('wiki_entity_links')
+    with op.batch_alter_table('wikis', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('ix_wikis_slug'))
+        batch_op.drop_index(batch_op.f('ix_wikis_name'))
+        batch_op.drop_index(batch_op.f('ix_wikis_board_id'))
+
+    op.drop_table('wikis')
+    with op.batch_alter_table('epics', schema=None) as batch_op:
+        batch_op.drop_index(batch_op.f('ix_epics_name'))
+        batch_op.drop_index(batch_op.f('ix_epics_closed'))
+        batch_op.drop_index(batch_op.f('ix_epics_board_id'))
+
+    op.drop_table('epics')
+    # ### end Alembic commands ###

backend/migrations/versions/c5b574480b80_add_file_upload.py

@@ -0,0 +1,54 @@
+"""add file upload
+
+Revision ID: c5b574480b80
+Revises: 1c0b9dfbd933
+Create Date: 2026-03-20 20:16:04.599906
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'c5b574480b80'
+down_revision = '1c0b9dfbd933'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('file_attachments',
+    sa.Column('id', sa.Integer(), nullable=False),
+    sa.Column('filename', sa.String(length=255), nullable=False),
+    sa.Column('original_name', sa.String(length=255), nullable=False),
+    sa.Column('file_type', sa.String(length=50), nullable=False),
+    sa.Column('mime_type', sa.String(length=100), nullable=False),
+    sa.Column('file_size', sa.Integer(), nullable=False),
+    sa.Column('minio_bucket', sa.String(length=100), nullable=False),
+    sa.Column('minio_object_name', sa.String(length=255), nullable=False),
+    sa.Column('thumbnail_minio_object_name', sa.String(length=255), nullable=True),
+    sa.Column('thumbnail_minio_bucket', sa.String(length=100), nullable=True),
+    sa.Column('attachable_type', sa.String(length=50), nullable=False),
+    sa.Column('attachable_id', sa.Integer(), nullable=False),
+    sa.Column('uploaded_by', sa.Integer(), nullable=False),
+    sa.Column('created_at', sa.DateTime(), nullable=True),
+    sa.ForeignKeyConstraint(['uploaded_by'], ['users.id'], ondelete='CASCADE'),
+    sa.PrimaryKeyConstraint('id'),
+    sa.UniqueConstraint('minio_object_name')
+    )
+    with op.batch_alter_table('file_attachments', schema=None) as batch_op:
+        batch_op.create_index('ix_file_attachments_attachable', ['attachable_type', 'attachable_id'], unique=False)
+        batch_op.create_index('ix_file_attachments_user', ['uploaded_by'], unique=False)
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    with op.batch_alter_table('file_attachments', schema=None) as batch_op:
+        batch_op.drop_index('ix_file_attachments_user')
+        batch_op.drop_index('ix_file_attachments_attachable')
+
+    op.drop_table('file_attachments')
+    # ### end Alembic commands ###

backend/migrations/versions/e9515e29ef8b_add_uuid_to_file_attachments.py

@@ -0,0 +1,59 @@
+"""Add UUID to file_attachments
+
+Revision ID: e9515e29ef8b
+Revises: c5b574480b80
+Create Date: 2026-03-20 21:58:22.006727
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import uuid
+
+
+# revision identifiers, used by Alembic.
+revision = 'e9515e29ef8b'
+down_revision = 'c5b574480b80'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    # Step 1: Add UUID column as nullable
+    op.add_column('file_attachments', sa.Column('uuid', sa.String(length=36), nullable=True))
+    
+    # Step 2: Populate UUID for existing rows
+    from sqlalchemy.sql import table, column, select, update
+    
+    file_attachments_table = table('file_attachments',
+        column('id', sa.Integer),
+        column('uuid', sa.String(36))
+    )
+    
+    connection = op.get_bind()
+    
+    # Get all existing file attachments
+    result = connection.execute(select(file_attachments_table.c.id))
+    for row in result:
+        new_uuid = str(uuid.uuid4())
+        connection.execute(
+            file_attachments_table.update()
+            .where(file_attachments_table.c.id == row[0])
+            .values(uuid=new_uuid)
+        )
+    
+    # Step 3: Make UUID not null and add constraints
+    op.alter_column('file_attachments', 'uuid', nullable=False)
+    op.create_index('ix_file_attachments_uuid', 'file_attachments', ['uuid'], unique=False)
+    op.create_unique_constraint('uq_file_attachments_uuid', 'file_attachments', ['uuid'])
+
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint('uq_file_attachments_uuid', 'file_attachments', type_='unique')
+    op.drop_index('ix_file_attachments_uuid', table_name='file_attachments')
+    op.drop_column('file_attachments', 'uuid')
+
+    # ### end Alembic commands ###

backend/requirements/base.txt

@@ -10,6 +10,8 @@ Werkzeug==3.0.1
 SQLAlchemy==2.0.23
 celery[redis]==5.3.6
 pydantic==2.5.3
+minio==7.2.0
+Pillow==10.1.0
 pytest==7.4.3
 pytest-flask==1.3.0
 pytest-cov==4.1.0

backend/tests/conftest.py

@@ -1,11 +1,14 @@
 """Pytest configuration and fixtures"""
 import logging
+from io import BytesIO
 
 import pytest
 from faker import Faker
+from PIL import Image
 
 from app import create_app, db
-from app.models import Order, OrderItem, Product, User
+from app.models import (Board, Card, Comment, List, Order, OrderItem, Product,
+                        User)
 
 log = logging.getLogger(__name__)
 fake = Faker()
@@ -225,3 +228,91 @@ def order(db_session, regular_user, products):
     order.total_amount = total_amount
     db_session.commit()
     return order
+
+
+# ============ File Upload Fixtures ============
+
+
+@pytest.fixture
+def test_image_file():
+    """Create a test image file as BytesIO"""
+    # Create a simple red PNG image using PIL
+    img = Image.new("RGB", (10, 10), color="red")
+    img_io = BytesIO()
+    img.save(img_io, format="PNG")
+    img_io.seek(0)
+    return img_io
+
+
+@pytest.fixture
+def test_large_image_file():
+    """Create a larger test image (50KB)"""
+    # Create a larger image using PIL
+    img = Image.new("RGB", (200, 200), color="blue")
+    img_io = BytesIO()
+    img.save(img_io, format="PNG")
+    img_io.seek(0)
+    return img_io
+
+
+@pytest.fixture
+def test_pdf_file():
+    """Create a test PDF file as BytesIO"""
+    # Minimal valid PDF
+    pdf_data = b"%PDF-1.4\n1 0 obj\n<<\n/Type /Catalog\n>>\nendobj\n%%EOF"
+    return BytesIO(pdf_data)
+
+
+@pytest.fixture
+def test_board(db_session, regular_user):
+    """Create a test board"""
+    board = Board(
+        user_id=regular_user.id,
+        name=fake.sentence(nb_words=4)[:-1],
+        description=fake.paragraph(),
+    )
+    db_session.add(board)
+    db_session.commit()
+    return board
+
+
+@pytest.fixture
+def test_list(db_session, test_board):
+    """Create a test list"""
+    lst = List(
+        board_id=test_board.id,
+        name=fake.sentence(nb_words=3)[:-1],
+        pos=0,
+    )
+    db_session.add(lst)
+    db_session.commit()
+    return lst
+
+
+@pytest.fixture
+def test_card(db_session, test_list):
+    """Create a test card"""
+    card = Card(
+        list_id=test_list.id,
+        name=fake.sentence(nb_words=4)[:-1],
+        description=fake.paragraph(),
+        pos=0,
+        due=None,
+        board_id=test_list.board_id,
+    )
+    db_session.add(card)
+    db_session.commit()
+    return card
+
+
+@pytest.fixture
+def test_comment(db_session, test_card, regular_user):
+    """Create a test comment"""
+    comment = Comment(
+        card_id=test_card.id,
+        user_id=regular_user.id,
+        text=fake.paragraph(),
+    )
+    db_session.add(comment)
+    db_session.commit()
+    return comment

backend/tests/routes/test_files.py

@@ -0,0 +1,372 @@
+"""Integration tests for file upload routes"""
+
+import pytest
+
+
+@pytest.mark.integration
+def test_upload_image_to_card(client, auth_headers, test_card, test_image_file):
+    """Test uploading an image to a card"""
+    data = {
+        "file": (test_image_file, "test.png", "image/png"),
+    }
+
+    response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    assert response.status_code == 201
+    file_data = response.get_json()
+    # Only check public-facing fields
+    assert file_data["original_name"] == "test.png"
+    assert file_data["file_type"] == "image"
+    assert file_data["file_size"] > 0
+    assert file_data["mime_type"] == "image/png"  # Mime type is now exposed
+    assert "uuid" in file_data
+    assert "download_url" in file_data
+    assert "thumbnail_url" in file_data
+    assert "view_url" in file_data
+    assert "created_at" in file_data
+
+    # Security: Verify internal details are NOT exposed
+    assert "id" not in file_data
+    assert "filename" not in file_data
+    assert "minio_bucket" not in file_data
+    assert "minio_object_name" not in file_data
+    assert "thumbnail_minio_bucket" not in file_data
+    assert "thumbnail_minio_object_name" not in file_data
+    assert "attachable_id" not in file_data
+    assert "attachable_type" not in file_data
+    assert "uploaded_by" not in file_data
+
+
+@pytest.mark.integration
+def test_upload_pdf_to_card(client, auth_headers, test_card, test_pdf_file):
+    """Test uploading a PDF to a card"""
+    data = {
+        "file": (test_pdf_file, "test.pdf", "application/pdf"),
+    }
+
+    response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    assert response.status_code == 201
+    file_data = response.get_json()
+    assert file_data["original_name"] == "test.pdf"
+    assert file_data["file_type"] == "pdf"  # PDFProcessor returns "pdf" as file_type
+    # PDFs don't have thumbnails
+    assert file_data.get("thumbnail_url") is None
+
+
+@pytest.mark.integration
+def test_upload_file_to_comment(client, auth_headers, test_comment, test_image_file):
+    """Test uploading a file to a comment"""
+    data = {
+        "file": (test_image_file, "comment_image.png", "image/png"),
+    }
+
+    response = client.post(
+        f"/api/comments/{test_comment.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    assert response.status_code == 201
+    file_data = response.get_json()
+    assert file_data["original_name"] == "comment_image.png"
+    assert file_data["file_type"] == "image"
+
+
+@pytest.mark.integration
+def test_get_card_attachments(client, auth_headers, test_card, test_image_file):
+    """Test getting all attachments for a card"""
+    # Upload a file first
+    data = {"file": (test_image_file, "test.png", "image/png")}
+    client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    # Get attachments
+    response = client.get(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    attachments_data = response.get_json()
+    assert attachments_data["count"] == 1
+    assert len(attachments_data["files"]) == 1
+    assert attachments_data["files"][0]["original_name"] == "test.png"
+    # Verify only public fields are exposed
+    assert "id" not in attachments_data["files"][0]
+    assert "attachable_id" not in attachments_data["files"][0]
+
+
+@pytest.mark.integration
+def test_get_comment_attachments(client, auth_headers, test_comment, test_image_file):
+    """Test getting all attachments for a comment"""
+    # Upload a file first
+    data = {"file": (test_image_file, "test.png", "image/png")}
+    client.post(
+        f"/api/comments/{test_comment.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    # Get attachments
+    response = client.get(
+        f"/api/comments/{test_comment.id}/attachments",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    attachments_data = response.get_json()
+    assert attachments_data["count"] == 1
+    assert len(attachments_data["files"]) == 1
+
+
+@pytest.mark.integration
+def test_get_file_by_uuid(client, auth_headers, test_card, test_image_file):
+    """Test getting file info by UUID"""
+    # Upload a file first
+    data = {"file": (test_image_file, "test.png", "image/png")}
+    upload_response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+    file_uuid = upload_response.get_json()["uuid"]
+
+    # Get file by UUID
+    response = client.get(
+        f"/api/files/{file_uuid}",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    file_data = response.get_json()
+    assert file_data["uuid"] == file_uuid
+    assert file_data["original_name"] == "test.png"
+    assert "download_url" in file_data
+    # Verify only public fields
+    assert "id" not in file_data
+    assert "attachable_id" not in file_data
+
+
+@pytest.mark.integration
+def test_delete_file(client, auth_headers, test_card, test_image_file):
+    """Test deleting a file"""
+    # Upload a file first
+    data = {"file": (test_image_file, "test.png", "image/png")}
+    upload_response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+    file_uuid = upload_response.get_json()["uuid"]
+
+    # Delete file
+    response = client.delete(
+        f"/api/files/{file_uuid}",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    delete_data = response.get_json()
+    assert delete_data["message"] == "File deleted"
+
+    # Verify file is deleted
+    get_response = client.get(
+        f"/api/files/{file_uuid}",
+        headers=auth_headers,
+    )
+    assert get_response.status_code == 404
+
+
+@pytest.mark.integration
+def test_download_file(client, auth_headers, test_card, test_image_file):
+    """Test downloading a file through proxy"""
+    # Upload a file first
+    data = {"file": (test_image_file, "test.png", "image/png")}
+    upload_response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+    file_uuid = upload_response.get_json()["uuid"]
+
+    # Download file
+    response = client.get(
+        f"/api/files/{file_uuid}/download",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    assert response.content_type == "image/png"
+    assert "Content-Disposition" in response.headers
+    assert "test.png" in response.headers["Content-Disposition"]
+
+
+@pytest.mark.integration
+def test_view_file(client, auth_headers, test_card, test_image_file):
+    """Test viewing a file inline through proxy"""
+    # Upload a file first
+    data = {"file": (test_image_file, "test.png", "image/png")}
+    upload_response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+    file_uuid = upload_response.get_json()["uuid"]
+
+    # View file inline
+    response = client.get(
+        f"/api/files/{file_uuid}/view",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    assert response.content_type == "image/png"
+    assert "inline" in response.headers["Content-Disposition"]
+
+
+@pytest.mark.integration
+def test_download_thumbnail(client, auth_headers, test_card, test_image_file):
+    """Test downloading a file thumbnail"""
+    # Upload an image file
+    data = {"file": (test_image_file, "test.png", "image/png")}
+    upload_response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+    file_uuid = upload_response.get_json()["uuid"]
+
+    # Download thumbnail
+    response = client.get(
+        f"/api/files/{file_uuid}/thumbnail",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    assert response.content_type == "image/jpeg"
+
+
+@pytest.mark.integration
+def test_thumbnail_not_available_for_pdf(
+    client, auth_headers, test_card, test_pdf_file
+):
+    """Test that PDF files don't have thumbnails"""
+    # Upload a PDF file
+    data = {"file": (test_pdf_file, "test.pdf", "application/pdf")}
+    upload_response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+    file_uuid = upload_response.get_json()["uuid"]
+
+    # Try to download thumbnail
+    response = client.get(
+        f"/api/files/{file_uuid}/thumbnail",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_upload_without_authentication(client, test_card, test_image_file):
+    """Test uploading a file without authentication"""
+    data = {"file": (test_image_file, "test.png", "image/png")}
+
+    response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    assert response.status_code == 401
+
+
+@pytest.mark.integration
+def test_get_card_attachments_empty(client, auth_headers, test_card):
+    """Test getting attachments when card has none"""
+    response = client.get(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 200
+    attachments_data = response.get_json()
+    assert attachments_data["count"] == 0
+    assert len(attachments_data["files"]) == 0
+
+
+@pytest.mark.integration
+def test_upload_without_file(client, auth_headers, test_card):
+    """Test uploading without providing a file"""
+    data = {}
+
+    response = client.post(
+        f"/api/cards/{test_card.id}/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    assert response.status_code == 400
+
+
+@pytest.mark.integration
+def test_upload_with_invalid_card_id(client, auth_headers, test_image_file):
+    """Test uploading to a non-existent card"""
+    data = {"file": (test_image_file, "test.png", "image/png")}
+
+    response = client.post(
+        "/api/cards/99999/attachments",
+        headers=auth_headers,
+        data=data,
+        content_type="multipart/form-data",
+    )
+
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_get_file_with_invalid_uuid(client, auth_headers):
+    """Test getting a file with an invalid UUID"""
+    response = client.get(
+        "/api/files/invalid-uuid-12345",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 404
+
+
+@pytest.mark.integration
+def test_delete_file_with_invalid_uuid(client, auth_headers):
+    """Test deleting a file with an invalid UUID"""
+    response = client.delete(
+        "/api/files/invalid-uuid-12345",
+        headers=auth_headers,
+    )
+
+    assert response.status_code == 404

docker-compose.dev.yml

@@ -23,8 +23,30 @@ services:
       - "6381:6379"
     restart: unless-stopped
 
+  minio:
+    image: minio/minio:latest
+    container_name: kanban-app-minio
+    command: server /data --console-address ":9001"
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    environment:
+      - MINIO_ROOT_USER=${MINIO_ROOT_USER:-minioadmin}
+      - MINIO_ROOT_PASSWORD=${MINIO_ROOT_PASSWORD:-minioadmin}
+    volumes:
+      - minio-data:/data
+    networks:
+      - kanban-app-network
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 30s
+      timeout: 20s
+      retries: 3
+
 volumes:
   postgres-dev-data:
+  minio-data:
 
 networks:
   kanban-app-network:

docker-compose.yml

@@ -55,6 +55,27 @@ services:
       - crafting-shop-network
     restart: unless-stopped
 
+  minio:
+    image: minio/minio:latest
+    container_name: crafting-shop-minio
+    command: server /data --console-address ":9001"
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    environment:
+      - MINIO_ROOT_USER=${MINIO_ROOT_USER:-minioadmin}
+      - MINIO_ROOT_PASSWORD=${MINIO_ROOT_PASSWORD:-minioadmin}
+    volumes:
+      - minio-data:/data
+    networks:
+      - crafting-shop-network
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 30s
+      timeout: 20s
+      retries: 3
+
   celery_worker:
     build:
       context: ./backend
@@ -163,6 +184,7 @@ volumes:
   grafana-data:
   backend-data:
   celery-beat-data:
+  minio-data:
 
 networks:
   crafting-shop-network:

frontend/package-lock.json

@@ -17,12 +17,16 @@
         "react-dom": "^18.2.0",
         "react-hook-form": "^7.71.2",
         "react-router-dom": "^6.20.1",
+        "slate": "^0.123.0",
+        "slate-history": "^0.113.1",
+        "slate-react": "^0.123.0",
         "zod": "^4.3.6"
       },
       "devDependencies": {
         "@testing-library/jest-dom": "^6.1.5",
         "@testing-library/react": "^14.1.2",
         "@testing-library/user-event": "^14.5.1",
+        "@types/node": "^25.5.0",
         "@types/react": "^18.3.28",
         "@types/react-dom": "^18.3.7",
         "@typescript-eslint/eslint-plugin": "^8.56.1",
@@ -1054,6 +1058,11 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@juggle/resize-observer": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/@juggle/resize-observer/-/resize-observer-3.4.0.tgz",
+      "integrity": "sha512-dfLbk+PwWvFzSxwk3n5ySL0hfBog779o8h68wK/7/APo/7cgyWp5jcXockbxdk5kFRkbeXWm4Fbi9FrdN381sA=="
+    },
     "node_modules/@nodelib/fs.scandir": {
       "version": "2.1.5",
       "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
@@ -1614,6 +1623,15 @@
       "integrity": "sha512-dWHzHa2WqEXI/O1E9OjrocMTKJl2mSrEolh1Iomrv6U+JuNwaHXsXx9bLu5gG7BUWFIN0skIQJQ/L1rIex4X6w==",
       "dev": true
     },
+    "node_modules/@types/node": {
+      "version": "25.5.0",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-25.5.0.tgz",
+      "integrity": "sha512-jp2P3tQMSxWugkCUKLRPVUpGaL5MVFwF8RDuSRztfwgN1wmqJeMSbKlnEtQqU8UrhTmzEmZdu2I6v2dpp7XIxw==",
+      "dev": true,
+      "dependencies": {
+        "undici-types": "~7.18.0"
+      }
+    },
     "node_modules/@types/prop-types": {
       "version": "15.7.15",
       "resolved": "https://registry.npmjs.org/@types/prop-types/-/prop-types-15.7.15.tgz",
@@ -2766,6 +2784,11 @@
         "node": ">= 6"
       }
     },
+    "node_modules/compute-scroll-into-view": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/compute-scroll-into-view/-/compute-scroll-into-view-3.1.1.tgz",
+      "integrity": "sha512-VRhuHOLoKYOy4UbilLbUzbYg93XLjv2PncJC50EuTWPA3gaja1UjBsUP/D/9/juV3vQFr6XBEzn9KCAHdUvOHw=="
+    },
     "node_modules/concat-map": {
       "version": "0.0.1",
       "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
@@ -3057,6 +3080,18 @@
         "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
       }
     },
+    "node_modules/direction": {
+      "version": "1.0.4",
+      "resolved": "https://registry.npmjs.org/direction/-/direction-1.0.4.tgz",
+      "integrity": "sha512-GYqKi1aH7PJXxdhTeZBFrg8vUBeKXi+cNprXsC1kpJcbcVnV9wBsrOu1cQEdG0WeQwlfHiy3XvnKfIrJ2R0NzQ==",
+      "bin": {
+        "direction": "cli.js"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/dlv": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/dlv/-/dlv-1.1.3.tgz",
@@ -4486,6 +4521,11 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/is-hotkey": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/is-hotkey/-/is-hotkey-0.2.0.tgz",
+      "integrity": "sha512-UknnZK4RakDmTgz4PI1wIph5yxSs/mvChWs9ifnlXsKuXgWmOkY/hAE0H/k2MIqH0RlRye0i1oC07MCRSD28Mw=="
+    },
     "node_modules/is-map": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/is-map/-/is-map-2.0.3.tgz",
@@ -4544,6 +4584,14 @@
         "node": ">=8"
       }
     },
+    "node_modules/is-plain-object": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-5.0.0.tgz",
+      "integrity": "sha512-VRSzKkbMm5jMDoKLbltAkFQ5Qr7VDiTFGXxYFXXowVj387GeGNOCsOH6Msy00SGZ3Fp84b1Naa1psqgcCIEP5Q==",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
     "node_modules/is-potential-custom-element-name": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/is-potential-custom-element-name/-/is-potential-custom-element-name-1.0.1.tgz",
@@ -4921,6 +4969,11 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/lodash": {
+      "version": "4.17.23",
+      "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.23.tgz",
+      "integrity": "sha512-LgVTMpQtIopCi79SJeDiP0TfWi5CNEc/L/aRdTh3yIvmZXTnheWpKjSZhnvMl8iXbC1tFg9gdHHDMLoV7CnG+w=="
+    },
     "node_modules/lodash.merge": {
       "version": "4.6.2",
       "resolved": "https://registry.npmjs.org/lodash.merge/-/lodash.merge-4.6.2.tgz",
@@ -6210,6 +6263,14 @@
         "loose-envify": "^1.1.0"
       }
     },
+    "node_modules/scroll-into-view-if-needed": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/scroll-into-view-if-needed/-/scroll-into-view-if-needed-3.1.0.tgz",
+      "integrity": "sha512-49oNpRjWRvnU8NyGVmUaYG4jtTkNonFZI86MmGRDqBphEK2EXT9gdEUoQPZhuBM8yWHxCWbobltqYO5M4XrUvQ==",
+      "dependencies": {
+        "compute-scroll-into-view": "^3.0.2"
+      }
+    },
     "node_modules/semver": {
       "version": "6.3.1",
       "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.1.tgz",
@@ -6390,6 +6451,59 @@
         "node": ">= 10"
       }
     },
+    "node_modules/slate": {
+      "version": "0.123.0",
+      "resolved": "https://registry.npmjs.org/slate/-/slate-0.123.0.tgz",
+      "integrity": "sha512-Oon3HR/QzJQBjuOUJT1jGGlp8Ff7t3Bkr/rJ2lDqxNT4H+cBnXpEVQ/si6hn1ZCHhD2xY/2N91PQoH/rD7kxTg=="
+    },
+    "node_modules/slate-dom": {
+      "version": "0.123.0",
+      "resolved": "https://registry.npmjs.org/slate-dom/-/slate-dom-0.123.0.tgz",
+      "integrity": "sha512-OUinp4tvSrAlt64JL9y20Xin08jgnnj1gJmIuPdGvU5MELKXRNZh17a7EKKNOS6OZPAE8Dk9NI1MAIS/Qz0YBw==",
+      "peer": true,
+      "dependencies": {
+        "@juggle/resize-observer": "^3.4.0",
+        "direction": "^1.0.4",
+        "is-hotkey": "^0.2.0",
+        "is-plain-object": "^5.0.0",
+        "lodash": "^4.17.21",
+        "scroll-into-view-if-needed": "^3.1.0",
+        "tiny-invariant": "1.3.1"
+      },
+      "peerDependencies": {
+        "slate": ">=0.121.0"
+      }
+    },
+    "node_modules/slate-history": {
+      "version": "0.113.1",
+      "resolved": "https://registry.npmjs.org/slate-history/-/slate-history-0.113.1.tgz",
+      "integrity": "sha512-J9NSJ+UG2GxoW0lw5mloaKcN0JI0x2IA5M5FxyGiInpn+QEutxT1WK7S/JneZCMFJBoHs1uu7S7e6pxQjubHmQ==",
+      "dependencies": {
+        "is-plain-object": "^5.0.0"
+      },
+      "peerDependencies": {
+        "slate": ">=0.65.3"
+      }
+    },
+    "node_modules/slate-react": {
+      "version": "0.123.0",
+      "resolved": "https://registry.npmjs.org/slate-react/-/slate-react-0.123.0.tgz",
+      "integrity": "sha512-nQwXL1FEacrY9ZFmatRhoBnsySNUX2x6qB77V3oNHd7wWxBJWuzz4GMrBXcVoRE8Gac7Angf8xaNGzb6zcPlHg==",
+      "dependencies": {
+        "@juggle/resize-observer": "^3.4.0",
+        "direction": "^1.0.4",
+        "is-hotkey": "^0.2.0",
+        "lodash": "^4.17.21",
+        "scroll-into-view-if-needed": "^3.1.0",
+        "tiny-invariant": "1.3.1"
+      },
+      "peerDependencies": {
+        "react": ">=18.2.0",
+        "react-dom": ">=18.2.0",
+        "slate": ">=0.121.0",
+        "slate-dom": ">=0.119.1"
+      }
+    },
     "node_modules/source-map-js": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
@@ -6734,6 +6848,11 @@
         "node": ">=0.8"
       }
     },
+    "node_modules/tiny-invariant": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/tiny-invariant/-/tiny-invariant-1.3.1.tgz",
+      "integrity": "sha512-AD5ih2NlSssTCwsMznbvwMZpJ1cbhkGd2uueNxzv2jDlEeZdU04JQfRnggJQ8DrcVBGjAsCKwFBbDlVNtEMlzw=="
+    },
     "node_modules/tinybench": {
       "version": "2.9.0",
       "resolved": "https://registry.npmjs.org/tinybench/-/tinybench-2.9.0.tgz",
@@ -7018,6 +7137,12 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/undici-types": {
+      "version": "7.18.2",
+      "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
+      "integrity": "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==",
+      "dev": true
+    },
     "node_modules/universalify": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-0.2.0.tgz",

frontend/package.json

@@ -23,12 +23,16 @@
     "react-dom": "^18.2.0",
     "react-hook-form": "^7.71.2",
     "react-router-dom": "^6.20.1",
+    "slate": "^0.123.0",
+    "slate-history": "^0.113.1",
+    "slate-react": "^0.123.0",
     "zod": "^4.3.6"
   },
   "devDependencies": {
     "@testing-library/jest-dom": "^6.1.5",
     "@testing-library/react": "^14.1.2",
     "@testing-library/user-event": "^14.5.1",
+    "@types/node": "^25.5.0",
     "@types/react": "^18.3.28",
     "@types/react-dom": "^18.3.7",
     "@typescript-eslint/eslint-plugin": "^8.56.1",

frontend/src/App.tsx

@@ -1,4 +1,6 @@
 import { Routes, Route, Navigate } from 'react-router-dom';
+import { useEffect, useState } from 'react';
+import { useApp } from './context/AppContext';
 import { ModalProvider } from './context/modals/useModal';
 import { ModalRoot } from './context/modals/ModalRoot';
 import { ToastProvider } from './context/toasts/useToast';
@@ -14,18 +16,43 @@ import { Boards } from './pages/Boards';
 import { BoardCreate } from './pages/BoardCreate';
 import { BoardEdit } from './pages/BoardEdit';
 import { BoardDetail } from './pages/BoardDetail';
+import { BoardEpics } from './pages/BoardEpics';
+import CreateEpic from './pages/CreateEpic';
+import { EpicDetail } from './pages/EpicDetail';
+import { BoardWikis } from './pages/BoardWikis';
+import CreateWiki from './pages/CreateWiki';
+import { WikiDetail } from './pages/WikiDetail';
 import { CardDetail } from './pages/CardDetail';
 
 const App = () => {
+  const { token } = useApp();
+  const [isAuthenticated, setIsAuthenticated] = useState<boolean | null>(null);
+
+  useEffect(() => {
+    setIsAuthenticated(!!token);
+  }, [token]);
+
+  if (isAuthenticated === null) {
+    return null;
+  }
   return (
     <LoaderProvider>
       <ToastProvider>
         <ModalProvider>
           <div className="min-h-screen bg-gray-900 text-gray-100">
             <Navbar />
-            <main className="flex-1 p-8 max-w-7xl mx-auto w-full">
+            <main>
               <Routes>
-                <Route path="/" element={<Navigate to="/boards" replace />} />
+                <Route
+                  path="/"
+                  element={
+                    isAuthenticated ? (
+                      <Navigate to="/boards" replace />
+                    ) : (
+                      <Navigate to="/home" replace />
+                    )
+                  }
+                />
                 <Route path="/home" element={<Home />} />
                 <Route path="/login" element={<Login />} />
                 <Route path="/register" element={<Register />} />
@@ -63,6 +90,54 @@ const App = () => {
                     </ProtectedRoute>
                   }
                 />
+                <Route
+                  path="/boards/:id/epics"
+                  element={
+                    <ProtectedRoute>
+                      <BoardEpics />
+                    </ProtectedRoute>
+                  }
+                />
+                <Route
+                  path="/boards/:id/epics/new"
+                  element={
+                    <ProtectedRoute>
+                      <CreateEpic />
+                    </ProtectedRoute>
+                  }
+                />
+                <Route
+                  path="/boards/:id/epics/:epicId"
+                  element={
+                    <ProtectedRoute>
+                      <EpicDetail />
+                    </ProtectedRoute>
+                  }
+                />
+                <Route
+                  path="/boards/:id/wikis"
+                  element={
+                    <ProtectedRoute>
+                      <BoardWikis />
+                    </ProtectedRoute>
+                  }
+                />
+                <Route
+                  path="/boards/:id/wikis/new"
+                  element={
+                    <ProtectedRoute>
+                      <CreateWiki />
+                    </ProtectedRoute>
+                  }
+                />
+                <Route
+                  path="/boards/:id/wikis/:wikiId"
+                  element={
+                    <ProtectedRoute>
+                      <WikiDetail />
+                    </ProtectedRoute>
+                  }
+                />
                 <Route
                   path="/boards/:id/cards/:cardId"
                   element={

frontend/src/components/BoardSidebar.tsx

@@ -0,0 +1,40 @@
+import { Link, useLocation } from 'react-router-dom';
+
+interface BoardSidebarProps {
+  boardId: string;
+}
+
+export function BoardSidebar({ boardId }: BoardSidebarProps) {
+  const location = useLocation();
+
+  const menuItems = [
+    { id: 'epics', label: 'Epics', icon: '📋', path: `/boards/${boardId}/epics` },
+    { id: 'wikis', label: 'Wikis', icon: '📚', path: `/boards/${boardId}/wikis` },
+    { id: 'history', label: 'History', icon: '📜', path: `/boards/${boardId}/history` },
+  ];
+
+  return (
+    <div className="w-64 bg-gray-800 rounded-lg p-4 border border-gray-700 h-fit sticky top-4">
+      <h3 className="text-white font-bold text-lg mb-4">Board Menu</h3>
+      <nav className="space-y-2">
+        {menuItems.map((item) => {
+          const isActive = location.pathname === item.path;
+          return (
+            <Link
+              key={item.id}
+              to={item.path}
+              className={`flex items-center gap-3 px-3 py-2 rounded-md transition-colors ${
+                isActive
+                  ? 'bg-blue-600 text-white'
+                  : 'text-gray-300 hover:bg-gray-700 hover:text-white'
+              }`}
+            >
+              <span className="text-lg">{item.icon}</span>
+              <span className="font-medium">{item.label}</span>
+            </Link>
+          );
+        })}
+      </nav>
+    </div>
+  );
+}

frontend/src/components/CardAttachments.tsx

@@ -0,0 +1,163 @@
+import { useFileAttachments } from '../hooks/useFileAttachments';
+import Trash2Icon from './icons/Trash2Icon';
+import FileIcon from './icons/FileIcon';
+import DownloadIcon from './icons/DownloadIcon';
+import EyeIcon from './icons/EyeIcon';
+import { SecureImage } from './SecureImage';
+
+interface CardAttachmentsProps {
+  cardId?: number;
+}
+
+export function CardAttachments({ cardId }: CardAttachmentsProps) {
+  const { attachments, uploadFile, deleteAttachment } = useFileAttachments(cardId);
+
+  const handleFileUpload = async (e: React.ChangeEvent<HTMLInputElement>) => {
+    const file = e.target.files?.[0];
+    if (!file) return;
+
+    try {
+      await uploadFile(file);
+    } catch {
+      // Error already handled in hook with toast
+    }
+
+    // Reset input
+    e.target.value = '';
+  };
+
+  const handleDelete = async (fileUuid: string, fileName: string) => {
+    if (!window.confirm(`Are you sure you want to delete "${fileName}"?`)) {
+      return;
+    }
+
+    await deleteAttachment(fileUuid);
+  };
+
+  const formatFileSize = (bytes: number) => {
+    if (bytes === 0) return '0 Bytes';
+    const k = 1024;
+    const sizes = ['Bytes', 'KB', 'MB', 'GB'];
+    const i = Math.floor(Math.log(bytes) / Math.log(k));
+    return Math.round((bytes / Math.pow(k, i)) * 100) / 100 + ' ' + sizes[i];
+  };
+
+  const formatDate = (dateString: string) => {
+    return new Date(dateString).toLocaleDateString('en-US', {
+      month: 'short',
+      day: 'numeric',
+      year: 'numeric',
+    });
+  };
+
+  const isImage = (mimeType: string) => mimeType.startsWith('image/');
+
+  return (
+    <div className="bg-gray-800 rounded-lg p-6">
+      <div className="flex justify-between items-center mb-4">
+        <h2 className="text-xl font-bold text-white flex items-center gap-2">
+          <span className="w-5 h-5">
+            <FileIcon />
+          </span>
+          Attachments
+        </h2>
+        <div className="flex items-center gap-2">
+          <span className="text-gray-400 text-sm">{attachments.length} files</span>
+          <label className="bg-blue-600 hover:bg-blue-700 text-white font-medium py-2 px-4 rounded-lg transition-colors cursor-pointer flex items-center gap-2 text-sm">
+            Add Attachment
+            <input
+              type="file"
+              className="hidden"
+              onChange={handleFileUpload}
+              accept="image/*,.pdf"
+            />
+          </label>
+        </div>
+      </div>
+
+      {attachments.length === 0 ? (
+        <div className="text-center py-8 text-gray-400">
+          <p>No attachments yet</p>
+          <p className="text-sm mt-2">Upload images or PDFs to this card</p>
+        </div>
+      ) : (
+        <div className="space-y-3">
+          {attachments.map((attachment) => (
+            <div
+              key={attachment.uuid}
+              className="bg-gray-700 rounded-lg p-4 hover:bg-gray-650 transition-colors"
+            >
+              <div className="flex items-start gap-4">
+                {/* Thumbnail or file icon */}
+                <div className="flex-shrink-0">
+                  {isImage(attachment.mime_type) && attachment.thumbnail_url ? (
+                    <SecureImage
+                      url={attachment.thumbnail_url}
+                      alt={attachment.original_name}
+                      className="w-16 h-16 object-cover rounded"
+                    />
+                  ) : (
+                    <div className="w-16 h-16 bg-gray-600 rounded flex items-center justify-center">
+                      <span className="w-8 h-8 text-gray-400">
+                        <FileIcon />
+                      </span>
+                    </div>
+                  )}
+                </div>
+
+                {/* File info */}
+                <div className="flex-1 min-w-0">
+                  <div className="flex items-start justify-between gap-4">
+                    <div className="flex-1 min-w-0">
+                      <p className="text-white font-medium truncate">{attachment.original_name}</p>
+                      <p className="text-gray-400 text-sm mt-1">
+                        {formatFileSize(attachment.file_size)} • {formatDate(attachment.created_at)}
+                      </p>
+                    </div>
+
+                    {/* Action buttons */}
+                    <div className="flex items-center gap-2 flex-shrink-0">
+                      {isImage(attachment.mime_type) && attachment.view_url && (
+                        <a
+                          href={attachment.view_url}
+                          target="_blank"
+                          rel="noopener noreferrer"
+                          className="text-blue-400 hover:text-blue-300 transition-colors p-2"
+                          title="View"
+                        >
+                          <span className="w-4 h-4">
+                            <EyeIcon />
+                          </span>
+                        </a>
+                      )}
+                      {attachment.download_url && (
+                        <a
+                          href={attachment.download_url}
+                          className="text-blue-400 hover:text-blue-300 transition-colors p-2"
+                          title="Download"
+                        >
+                          <span className="w-4 h-4">
+                            <DownloadIcon />
+                          </span>
+                        </a>
+                      )}
+                      <button
+                        onClick={() => handleDelete(attachment.uuid, attachment.original_name)}
+                        className="text-red-400 hover:text-red-300 transition-colors p-2"
+                        title="Delete"
+                      >
+                        <span className="w-4 h-4">
+                          <Trash2Icon />
+                        </span>
+                      </button>
+                    </div>
+                  </div>
+                </div>
+              </div>
+            </div>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}

frontend/src/components/ELEMENT_TAGS.ts

@@ -0,0 +1,37 @@
+const ELEMENT_TAGS: Record<string, (el: HTMLElement) => Partial<any>> = {
+  A: (el: HTMLElement) => ({
+    type: 'link',
+    url: el.getAttribute('href') || '',
+    children: [],
+  }),
+  BLOCKQUOTE: () => ({ type: 'block-quote', children: [] }),
+  H1: () => ({ type: 'heading-one', children: [] }),
+  H2: () => ({ type: 'heading-two', children: [] }),
+  H3: () => ({ type: 'heading-three', children: [] }),
+  H4: () => ({ type: 'heading-four', children: [] }),
+  H5: () => ({ type: 'heading-five', children: [] }),
+  H6: () => ({ type: 'heading-six', children: [] }),
+  IMG: (el: HTMLElement) => ({
+    type: 'image',
+    url: el.getAttribute('src') || '',
+    children: [],
+  }),
+  LI: () => ({ type: 'list-item', children: [] }),
+  OL: () => ({ type: 'numbered-list', children: [] }),
+  P: () => ({ type: 'paragraph', children: [] }),
+  PRE: () => ({ type: 'code-block', children: [] }),
+  CODE: () => ({ type: 'code-line bg-gray-900', children: [] }),
+  UL: () => ({ type: 'bulleted-list', children: [] }),
+};
+
+const TEXT_TAGS: Record<string, () => Record<string, boolean>> = {
+  CODE: () => ({ code: true }),
+  DEL: () => ({ strikethrough: true }),
+  EM: () => ({ italic: true }),
+  I: () => ({ italic: true }),
+  S: () => ({ strikethrough: true }),
+  STRONG: () => ({ bold: true }),
+  U: () => ({ underline: true }),
+};
+
+export { ELEMENT_TAGS, TEXT_TAGS };

frontend/src/components/NarrowPageLayout.tsx

@@ -0,0 +1,5 @@
+import { ReactNode } from 'react';
+
+export const NarrowPageLayout = ({ children }: { children: ReactNode }) => {
+  return <div className="flex-1 p-8 mx-auto w-full max-w-7xl">{children}</div>;
+};

frontend/src/components/Navbar.tsx

@@ -1,27 +1,31 @@
 import { Link } from 'react-router-dom';
+import { useState } from 'react';
 import { useApp } from '../context/AppContext';
 import { useAuth } from '../hooks/useAuth';
 import { TaskboardLogo } from './TaskboardLogo';
+import MenuIcon from './icons/MenuIcon';
+import CloseIcon from './icons/CloseIcon';
 
 export function Navbar() {
   const { user } = useApp();
   const { logout } = useAuth();
+  const [mobileMenuOpen, setMobileMenuOpen] = useState(false);
 
   return (
     <nav className="bg-gray-800 border-b border-gray-700 shadow-md">
       <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
         <div className="flex items-center justify-between h-16">
-          <div className="flex items-center gap-3">
-            <Link to="/boards" className="hover:opacity-80 transition-opacity">
+          <div className="flex items-center">
+            <Link to="/boards" className="hover:opacity-80 transition-opacity flex-shrink-0">
               <TaskboardLogo className="h-8 w-auto" />
             </Link>
             <Link
               to="/boards"
-              className="text-xl font-bold text-white hover:text-blue-400 transition-colors"
+              className="text-xl font-bold text-white hover:text-blue-400 transition-colors ml-2"
             >
               Taskboard
             </Link>
-            <div className="ml-10 flex items-baseline space-x-4">
+            <div className="hidden md:flex items-baseline ml-10 space-x-4">
               <Link
                 to="/home"
                 className="text-gray-300 hover:text-white px-3 py-2 rounded-md text-sm font-medium transition-colors"
@@ -39,7 +43,7 @@ export function Navbar() {
               )}
             </div>
           </div>
-          <div className="flex items-center gap-3">
+          <div className="hidden md:flex items-center gap-3">
             {user ? (
               <>
                 <span className="text-gray-300 px-3 py-2">{user.username}</span>
@@ -67,8 +71,76 @@ export function Navbar() {
               </>
             )}
           </div>
+          <div className="md:hidden flex items-center">
+            <button
+              onClick={() => setMobileMenuOpen(!mobileMenuOpen)}
+              className="text-gray-300 hover:text-white p-2 rounded-md"
+              aria-label="Toggle menu"
+            >
+              {mobileMenuOpen ? <CloseIcon /> : <MenuIcon />}
+            </button>
           </div>
         </div>
+      </div>
+
+      {/* Mobile menu */}
+      {mobileMenuOpen && (
+        <div className="md:hidden bg-gray-800 border-t border-gray-700">
+          <div className="px-2 pt-2 pb-3 space-y-1 sm:px-3">
+            <Link
+              to="/home"
+              className="text-gray-300 hover:text-white block px-3 py-2 rounded-md text-base font-medium"
+              onClick={() => setMobileMenuOpen(false)}
+            >
+              Home
+            </Link>
+
+            {user && (
+              <Link
+                to="/boards"
+                className="text-gray-300 hover:text-white block px-3 py-2 rounded-md text-base font-medium"
+                onClick={() => setMobileMenuOpen(false)}
+              >
+                Boards
+              </Link>
+            )}
+
+            <div className="border-t border-gray-700 my-2"></div>
+
+            {user ? (
+              <>
+                <div className="px-3 py-2 text-gray-300 text-base font-medium">{user.username}</div>
+                <button
+                  onClick={() => {
+                    logout();
+                    setMobileMenuOpen(false);
+                  }}
+                  className="text-gray-300 hover:text-white block w-full text-left px-3 py-2 rounded-md text-base font-medium"
+                >
+                  Logout
+                </button>
+              </>
+            ) : (
+              <>
+                <Link
+                  to="/login"
+                  className="text-gray-300 hover:text-white block px-3 py-2 rounded-md text-base font-medium"
+                  onClick={() => setMobileMenuOpen(false)}
+                >
+                  Login
+                </Link>
+                <Link
+                  to="/register"
+                  className="bg-blue-600 hover:bg-blue-700 text-white block px-3 py-2 rounded-md text-base font-medium"
+                  onClick={() => setMobileMenuOpen(false)}
+                >
+                  Register
+                </Link>
+              </>
+            )}
+          </div>
+        </div>
+      )}
     </nav>
   );
 }

frontend/src/components/RichTextContent.tsx

@@ -0,0 +1,33 @@
+import { useCallback, useMemo } from 'react';
+import { createEditor, Descendant } from 'slate';
+import { Slate, Editable, withReact, RenderElementProps, RenderLeafProps } from 'slate-react';
+import { Leaf, SlateRenderElement, withHtml } from './slate-editor-components';
+
+export interface RichTextContentProps {
+  content: Descendant[] | null;
+  className?: string;
+}
+
+const RichTextContent = ({ content }: any) => {
+  const editor = useMemo(() => withHtml(withReact(createEditor())), []);
+
+  // const editor = useMemo(() => withHtml(withHistory(withReact(createEditor()))), []);
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <SlateRenderElement {...props} />,
+    []
+  );
+
+  const renderLeaf = useCallback((props: RenderLeafProps) => <Leaf {...props} />, []);
+  return (
+    <Slate editor={editor} initialValue={content}>
+      <Editable
+        renderElement={renderElement}
+        renderLeaf={renderLeaf}
+        readOnly
+        placeholder="Enter some plain text..."
+      />
+    </Slate>
+  );
+};
+
+export default RichTextContent;

frontend/src/components/RichTextEditor.tsx

@@ -0,0 +1,126 @@
+import React, { useMemo, useCallback } from 'react';
+import { createEditor, Descendant, Editor } from 'slate';
+import {
+  Slate,
+  Editable,
+  withReact as withReactPlugin,
+  useSlate,
+  RenderElementProps,
+  RenderLeafProps,
+} from 'slate-react';
+import { withHistory } from 'slate-history';
+import { CustomEditor, CustomTextKey } from './custom-types';
+import {
+  BlockButton,
+  Button,
+  Icon,
+  Leaf,
+  SlateRenderElement,
+  Toolbar,
+  withHtml,
+} from './slate-editor-components';
+
+export interface RichTextEditorProps {
+  value: Descendant[];
+  onChange: (value: Descendant[]) => void;
+  placeholder?: string;
+  readOnly?: boolean;
+  className?: string;
+}
+
+interface MarkButtonProps {
+  format: CustomTextKey;
+  icon: string;
+}
+
+const isMarkActive = (editor: CustomEditor, format: CustomTextKey) => {
+  const marks = Editor.marks(editor);
+  return marks ? marks[format] === true : false;
+};
+
+const toggleMark = (editor: CustomEditor, format: CustomTextKey) => {
+  const isActive = isMarkActive(editor, format);
+
+  if (isActive) {
+    Editor.removeMark(editor, format);
+  } else {
+    Editor.addMark(editor, format, true);
+  }
+};
+
+const MarkButton = ({ format, icon }: MarkButtonProps) => {
+  const editor = useSlate();
+  return (
+    <Button
+      active={isMarkActive(editor, format)}
+      onPointerDown={(event: any) => event.preventDefault()}
+      onClick={() => toggleMark(editor, format)}
+    >
+      <Icon>{icon}</Icon>
+    </Button>
+  );
+};
+
+const RichTextEditor: React.FC<RichTextEditorProps> = ({
+  value,
+  onChange,
+  placeholder = 'Type something...',
+  readOnly = false,
+  className = '',
+}) => {
+  const editor = useMemo(() => withHtml(withHistory(withReactPlugin(createEditor()))), []);
+
+  const renderElement = useCallback(
+    (props: RenderElementProps) => <SlateRenderElement {...props} />,
+    []
+  );
+
+  //   const renderElement = useCallback((props: any) => {
+  //   switch (props.element.type) {
+  //     case "block-quote":
+  //       return <blockquote {...props.attributes}>{props.children}</blockquote>;
+  //     case "bulleted-list":
+  //       return <ul {...props.attributes}>{props.children}</ul>;
+  //     case "list-item":
+  //       return <li {...props.attributes}>{props.children}</li>;
+  //     case "numbered-list":
+  //       return <ol {...props.attributes}>{props.children}</ol>;
+  //     default:
+  //       return <p {...props.attributes}>{props.children}</p>;
+  //   }
+  // }, []);
+
+  const renderLeaf = useCallback((props: RenderLeafProps) => <Leaf {...props} />, []);
+
+  return (
+    <div className={`bg-gray-800 rounded-lg border border-gray-700 ${className}`}>
+      <Slate editor={editor} initialValue={value} onChange={onChange}>
+        <Toolbar>
+          <MarkButton format="bold" icon="format_bold" />
+          <MarkButton format="italic" icon="format_italic" />
+          <MarkButton format="underline" icon="format_underlined" />
+          <MarkButton format="code" icon="code" />
+          <BlockButton format="heading-one" icon="looks_one" />
+          <BlockButton format="heading-two" icon="looks_two" />
+          <BlockButton format="block-quote" icon="format_quote" />
+          <BlockButton format="numbered-list" icon="format_list_numbered" />
+          <BlockButton format="bulleted-list" icon="format_list_bulleted" />
+          <BlockButton format="left" icon="format_align_left" />
+          <BlockButton format="center" icon="format_align_center" />
+          <BlockButton format="right" icon="format_align_right" />
+          <BlockButton format="justify" icon="format_align_justify" />
+        </Toolbar>
+        <Editable
+          renderElement={renderElement}
+          renderLeaf={renderLeaf}
+          placeholder={placeholder}
+          readOnly={readOnly}
+          className="min-h-[200px] p-4 text-gray-100 focus:outline-none"
+          spellCheck
+        />
+      </Slate>
+    </div>
+  );
+};
+
+export default RichTextEditor;

frontend/src/components/SecureImage.tsx

@@ -0,0 +1,46 @@
+import { useSecureImage } from '../hooks/useSecureImage';
+
+interface SecureImageProps {
+  url: string;
+  alt: string;
+  className?: string;
+  fallback?: React.ReactNode;
+}
+
+export function SecureImage({ url, alt, className = '', fallback }: SecureImageProps) {
+  const { imageUrl, loading, error } = useSecureImage(url);
+
+  // Show loading state
+  if (loading) {
+    return <div className={`bg-gray-600 animate-pulse ${className}`}></div>;
+  }
+
+  // Show error or fallback
+  if (error || !imageUrl) {
+    return fallback ? (
+      <>{fallback}</>
+    ) : (
+      <div className={`bg-gray-600 flex items-center justify-center ${className}`}>
+        <svg
+          xmlns="http://www.w3.org/2000/svg"
+          width="24"
+          height="24"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          strokeWidth="2"
+          strokeLinecap="round"
+          strokeLinejoin="round"
+          className="text-gray-400"
+        >
+          <rect x="3" y="3" width="18" height="18" rx="2" ry="2"></rect>
+          <circle cx="8.5" cy="8.5" r="1.5"></circle>
+          <polyline points="21 15 16 10 5 21"></polyline>
+        </svg>
+      </div>
+    );
+  }
+
+  // Show image
+  return <img src={imageUrl} alt={alt} className={className} />;
+}

frontend/src/components/WidePageLayout.tsx

@@ -0,0 +1,5 @@
+import { ReactNode } from 'react';
+
+export const WidePageLayout = ({ children }: { children: ReactNode }) => {
+  return <div className="flex-1 p-8 mx-auto w-full max-w-7xl">{children}</div>;
+};

frontend/src/components/custom-types.d.ts

@@ -0,0 +1,196 @@
+import { Descendant, BaseEditor, BaseRange, Range, Element } from 'slate';
+import { ReactEditor } from 'slate-react';
+import { HistoryEditor } from 'slate-history';
+
+export type BlockQuoteElement = {
+  type: 'block-quote';
+  align?: string;
+  children: Descendant[];
+};
+
+export type BulletedListElement = {
+  type: 'bulleted-list';
+  align?: string;
+  children: Descendant[];
+};
+
+export type CheckListItemElement = {
+  type: 'check-list-item';
+  checked: boolean;
+  children: Descendant[];
+};
+
+export type EditableVoidElement = {
+  type: 'editable-void';
+  children: EmptyText[];
+};
+
+export type HeadingElement = {
+  type: 'heading-one';
+  align?: string;
+  children: Descendant[];
+};
+
+export type HeadingTwoElement = {
+  type: 'heading-two';
+  align?: string;
+  children: Descendant[];
+};
+
+export type HeadingThreeElement = {
+  type: 'heading-three';
+  align?: string;
+  children: Descendant[];
+};
+
+export type HeadingFourElement = {
+  type: 'heading-four';
+  align?: string;
+  children: Descendant[];
+};
+
+export type HeadingFiveElement = {
+  type: 'heading-five';
+  align?: string;
+  children: Descendant[];
+};
+
+export type HeadingSixElement = {
+  type: 'heading-six';
+  align?: string;
+  children: Descendant[];
+};
+
+export type ImageElement = {
+  type: 'image';
+  url: string;
+  children: EmptyText[];
+};
+
+export type LinkElement = { type: 'link'; url: string; children: Descendant[] };
+
+export type ButtonElement = { type: 'button'; children: Descendant[] };
+
+export type BadgeElement = { type: 'badge'; children: Descendant[] };
+
+export type ListItemElement = { type: 'list-item'; children: Descendant[] };
+
+export type NumberedListItemElement = {
+  type: 'numbered-list';
+  children: Descendant[];
+};
+
+export type MentionElement = {
+  type: 'mention';
+  character: string;
+  children: CustomText[];
+};
+
+export type ParagraphElement = {
+  type: 'paragraph';
+  align?: string;
+  children: Descendant[];
+};
+
+export type TableElement = { type: 'table'; children: TableRow[] };
+
+export type TableCellElement = { type: 'table-cell'; children: CustomText[] };
+
+export type TableRowElement = { type: 'table-row'; children: TableCell[] };
+
+export type TitleElement = { type: 'title'; children: Descendant[] };
+
+export type VideoElement = { type: 'video'; url: string; children: EmptyText[] };
+
+export type CodeBlockElement = {
+  type: 'code-block';
+  language: string;
+  children: Descendant[];
+};
+
+export type CodeLineElement = {
+  type: 'code-line';
+  children: Descendant[];
+};
+
+export type CustomElementWithAlign =
+  | ParagraphElement
+  | HeadingElement
+  | HeadingTwoElement
+  | HeadingThreeElement
+  | HeadingFourElement
+  | HeadingFiveElement
+  | HeadingSixElement
+  | BlockQuoteElement
+  | BulletedListElement;
+
+type CustomElement =
+  | BlockQuoteElement
+  | BulletedListElement
+  | CheckListItemElement
+  | EditableVoidElement
+  | HeadingElement
+  | HeadingTwoElement
+  | HeadingThreeElement
+  | HeadingFourElement
+  | HeadingFiveElement
+  | HeadingSixElement
+  | ImageElement
+  | LinkElement
+  | ButtonElement
+  | BadgeElement
+  | ListItemElement
+  | NumberedListItemElement
+  | MentionElement
+  | ParagraphElement
+  | TableElement
+  | TableRowElement
+  | TableCellElement
+  | TitleElement
+  | VideoElement
+  | CodeBlockElement
+  | CodeLineElement;
+
+export type CustomElementType = CustomElement['type'];
+
+export type CustomText = {
+  bold?: boolean;
+  italic?: boolean;
+  code?: boolean;
+  underline?: boolean;
+  strikethrough?: boolean;
+  // MARKDOWN PREVIEW SPECIFIC LEAF
+  underlined?: boolean;
+  title?: boolean;
+  list?: boolean;
+  hr?: boolean;
+  blockquote?: boolean;
+  text: string;
+};
+
+export type CustomTextKey = keyof Omit<CustomText, 'text'>;
+
+export type EmptyText = {
+  text: string;
+};
+
+export type RenderElementPropsFor<T> = RenderElementProps & {
+  element: T;
+};
+
+export type CustomEditor = BaseEditor &
+  ReactEditor &
+  HistoryEditor & {
+    nodeToDecorations?: Map<Element, Range[]>;
+  };
+
+declare module 'slate' {
+  interface CustomTypes {
+    Editor: CustomEditor;
+    Element: CustomElement;
+    Text: CustomText;
+    Range: BaseRange & {
+      [key: string]: unknown;
+    };
+  }
+}

frontend/src/components/icons/CloseIcon.tsx

@@ -0,0 +1,18 @@
+const CloseIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="24"
+    height="24"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <line x1="18" y1="6" x2="6" y2="18"></line>
+    <line x1="6" y1="6" x2="18" y2="18"></line>
+  </svg>
+);
+
+export default CloseIcon;

frontend/src/components/icons/DownloadIcon.tsx

@@ -0,0 +1,19 @@
+const DownloadIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4"></path>
+    <polyline points="7 10 12 15 17 10"></polyline>
+    <line x1="12" y1="15" x2="12" y2="3"></line>
+  </svg>
+);
+
+export default DownloadIcon;

frontend/src/components/icons/EyeIcon.tsx

@@ -0,0 +1,18 @@
+const EyeIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M1 12s4-8 11-8 11 8 11 8-4 8-11 8-11-8-11-8z"></path>
+    <circle cx="12" cy="12" r="3"></circle>
+  </svg>
+);
+
+export default EyeIcon;

frontend/src/components/icons/FileIcon.tsx

@@ -0,0 +1,18 @@
+const FileIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M13 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V9z"></path>
+    <polyline points="13 2 13 9 20 9"></polyline>
+  </svg>
+);
+
+export default FileIcon;

frontend/src/components/icons/MenuIcon.tsx

@@ -0,0 +1,19 @@
+const MenuIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="24"
+    height="24"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <line x1="3" y1="12" x2="21" y2="12"></line>
+    <line x1="3" y1="6" x2="21" y2="6"></line>
+    <line x1="3" y1="18" x2="21" y2="18"></line>
+  </svg>
+);
+
+export default MenuIcon;

frontend/src/components/isImageUrl.ts

@@ -0,0 +1,16 @@
+const isImageUrl = (url: string): boolean => {
+  if (!url) return false;
+
+  try {
+    new URL(url); // Validate URL format
+  } catch {
+    return false;
+  }
+
+  const imageExtensions = ['jpg', 'jpeg', 'png', 'gif', 'webp', 'svg', 'bmp', 'ico', 'tiff', 'tif'];
+  const ext = url.split('.').pop()?.toLowerCase();
+
+  return ext ? imageExtensions.includes(ext) : false;
+};
+
+export default isImageUrl;

frontend/src/components/slate-editor-components/index.tsx

@@ -0,0 +1,302 @@
+import React, { ReactNode } from 'react';
+import ReactDOM from 'react-dom';
+import { RenderElementProps, RenderLeafProps, useSlate } from 'slate-react';
+import {
+  CustomEditor,
+  CustomElement,
+  CustomElementType,
+  CustomElementWithAlign,
+} from '../custom-types';
+import { Editor, Node, Transforms, Element as SlateElement } from 'slate';
+import { deserialize } from '../useRichTextEditor';
+
+const LIST_TYPES = ['numbered-list', 'bulleted-list'] as const;
+const TEXT_ALIGN_TYPES = ['left', 'center', 'right', 'justify'] as const;
+
+type AlignType = (typeof TEXT_ALIGN_TYPES)[number];
+
+// --- Interfaces ---
+
+// Extend standard HTML attributes to include className, id, etc. automatically
+interface ButtonProps extends React.ButtonHTMLAttributes<HTMLButtonElement> {
+  active: boolean;
+  reversed?: boolean;
+}
+
+type ListType = (typeof LIST_TYPES)[number];
+type CustomElementFormat = CustomElementType | AlignType | ListType;
+
+const isAlignType = (format: CustomElementFormat): format is AlignType => {
+  return TEXT_ALIGN_TYPES.includes(format as AlignType);
+};
+
+const isListType = (format: CustomElementFormat): format is ListType => {
+  return LIST_TYPES.includes(format as ListType);
+};
+
+// --- Components ---
+
+export const Button = React.forwardRef<HTMLButtonElement, ButtonProps>(
+  ({ className, active, reversed, ...props }, ref) => {
+    // Determine color based on props logic from original CSS
+    let colorClass = '';
+    if (reversed) {
+      colorClass = active ? 'text-white' : 'text-[#aaa]';
+    } else {
+      colorClass = active ? 'text-black' : 'text-[#ccc]';
+    }
+
+    return (
+      <button
+        {...props}
+        type="button"
+        ref={ref}
+        className={`border-none bg-transparent p-0 cursor-pointer ${colorClass} ${className ?? ''}`}
+      />
+    );
+  }
+);
+Button.displayName = 'Button';
+
+export const Icon = React.forwardRef<HTMLSpanElement, React.HTMLAttributes<HTMLSpanElement>>(
+  ({ className, ...props }, ref) => (
+    <span
+      {...props}
+      ref={ref}
+      // 'material-icons' is kept as it likely comes from a global CSS link
+      className={`material-icons text-[18px] align-text-bottom ${className ?? ''}`}
+    />
+  )
+);
+Icon.displayName = 'Icon';
+
+export const Instruction = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div
+      {...props}
+      ref={ref}
+      className={`whitespace-pre-wrap my-0 mx-[-20px] mb-[10px] p-[10px] px-[20px] text-[14px] bg-[#f8f8e8] ${className ?? ''}`}
+    />
+  )
+);
+Instruction.displayName = 'Instruction';
+
+export const Menu = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <div
+      {...props}
+      data-test-id="menu"
+      ref={ref}
+      // Replaced inline-block + margin-left logic with flex + gap
+      className={`flex flex-wrap items-center gap-[15px] ${className ?? ''}`}
+    />
+  )
+);
+Menu.displayName = 'Menu';
+
+export const Portal = ({ children }: { children?: ReactNode }) => {
+  return typeof document === 'object' ? ReactDOM.createPortal(children, document.body) : null;
+};
+
+export const Toolbar = React.forwardRef<HTMLDivElement, React.HTMLAttributes<HTMLDivElement>>(
+  ({ className, ...props }, ref) => (
+    <Menu
+      {...props}
+      ref={ref}
+      className={`relative px-[18px] py-[1px] pb-[17px] mx-[-20px] mb-5 border-b-2 border-[#eee] ${className ?? ''}`}
+    />
+  )
+);
+Toolbar.displayName = 'Toolbar';
+
+export const Leaf = ({ attributes, children, leaf }: RenderLeafProps) => {
+  if (leaf.bold) {
+    children = <strong className="font-bold">{children}</strong>;
+  }
+
+  if (leaf.code) {
+    children = (
+      <code className="bg-gray-200 text-gray-800 px-1 py-0.5 rounded font-mono text-sm border border-gray-300">
+        {children}
+      </code>
+    );
+  }
+
+  if (leaf.italic) {
+    children = <em className="italic">{children}</em>;
+  }
+
+  if (leaf.underline) {
+    children = <u className="underline">{children}</u>;
+  }
+
+  return <span {...attributes}>{children}</span>;
+};
+
+const isAlignElement = (element: CustomElement): element is CustomElementWithAlign => {
+  return 'align' in element;
+};
+export const SlateRenderElement = ({ attributes, children, element }: RenderElementProps) => {
+  console.log('element.type', element);
+
+  switch (element.type) {
+    case 'block-quote':
+      return (
+        <blockquote
+          className="border-l-4 border-gray-300 pl-4 italic my-4 text-gray-700"
+          {...attributes}
+        >
+          {children}
+        </blockquote>
+      );
+    case 'code-block':
+      return (
+        <pre
+          className="bg-gray-100 text-gray-800 p-4 rounded-md overflow-x-auto my-4 font-mono text-sm border border-gray-300"
+          {...attributes}
+        >
+          <code>{children}</code>
+        </pre>
+      );
+    case 'bulleted-list':
+      return (
+        <ul className="list-disc pl-5 my-4" {...attributes}>
+          {children}
+        </ul>
+      );
+    case 'heading-one':
+      return (
+        <h1 className="text-4xl font-bold my-4" {...attributes}>
+          {children}
+        </h1>
+      );
+    case 'heading-two':
+      return (
+        <h2 className="text-3xl font-bold my-3" {...attributes}>
+          {children}
+        </h2>
+      );
+    case 'heading-three':
+      return (
+        <h2 className="text-1xl font-bold my-2" {...attributes}>
+          {children}
+        </h2>
+      );
+    case 'list-item':
+      return (
+        <li className="my-1" {...attributes}>
+          {children}
+        </li>
+      );
+    case 'numbered-list':
+      return (
+        <ol className="list-decimal pl-5 my-4" {...attributes}>
+          {children}
+        </ol>
+      );
+    default:
+      return (
+        <div className="inline my-2 mr-2 leading-relaxed prose prose-sm" {...attributes}>
+          {children}
+        </div>
+      );
+  }
+};
+
+const isBlockActive = (
+  editor: CustomEditor,
+  format: CustomElementFormat,
+  blockType: 'type' | 'align' = 'type'
+) => {
+  const { selection } = editor;
+  if (!selection) return false;
+
+  const [match] = Array.from(
+    Editor.nodes(editor, {
+      at: Editor.unhangRange(editor, selection),
+      match: (n) => {
+        if (Node.isElement(n)) {
+          if (blockType === 'align' && isAlignElement(n)) {
+            return n.align === format;
+          }
+          return n.type === format;
+        }
+        return false;
+      },
+    })
+  );
+
+  return !!match;
+};
+
+const toggleBlock = (editor: CustomEditor, format: CustomElementFormat) => {
+  const isActive = isBlockActive(editor, format, isAlignType(format) ? 'align' : 'type');
+  const isList = isListType(format);
+
+  Transforms.unwrapNodes(editor, {
+    match: (n) => Node.isElement(n) && isListType(n.type) && !isAlignType(format),
+    split: true,
+  });
+  let newProperties: Partial<SlateElement>;
+  if (isAlignType(format)) {
+    newProperties = {
+      align: isActive ? undefined : format,
+    };
+  } else {
+    newProperties = {
+      type: isActive ? 'paragraph' : isList ? 'list-item' : format,
+    };
+  }
+  Transforms.setNodes<SlateElement>(editor, newProperties);
+
+  if (!isActive && isList) {
+    const block = { type: format, children: [] } as any;
+    Transforms.wrapNodes(editor, block);
+  }
+};
+
+interface BlockButtonProps {
+  format: CustomElementFormat;
+  icon: string;
+}
+
+export const BlockButton = ({ format, icon }: BlockButtonProps) => {
+  const editor = useSlate();
+  return (
+    <Button
+      active={isBlockActive(editor, format, isAlignType(format) ? 'align' : 'type')}
+      onPointerDown={(event: any) => event.preventDefault()}
+      onClick={() => toggleBlock(editor, format)}
+      data-test-id={`block-button-${format}`}
+    >
+      <Icon>{icon}</Icon>
+    </Button>
+  );
+};
+
+export const withHtml = (editor: CustomEditor) => {
+  const { insertData, isInline, isVoid } = editor;
+
+  editor.isInline = (element: any) => {
+    return element.type === 'link' ? true : isInline(element);
+  };
+
+  editor.isVoid = (element: any) => {
+    return element.type === 'image' ? true : isVoid(element);
+  };
+
+  editor.insertData = (data) => {
+    const html = data.getData('text/html');
+
+    if (html) {
+      const parsed = new DOMParser().parseFromString(html, 'text/html');
+      const fragment = deserialize(parsed.body);
+      Transforms.insertFragment(editor, fragment);
+      return;
+    }
+
+    insertData(data);
+  };
+
+  return editor;
+};

frontend/src/hooks/useApi.ts

@@ -267,6 +267,87 @@ export function useApi() {
       deleteComment: async (id: number): Promise<void> => {
         await api.delete(`/comments/${id}`);
       },
+
+      // File Attachments
+      getCardAttachments: async (cardId: number): Promise<any> => {
+        const response = await api.get(`/cards/${cardId}/attachments`);
+        return response.data;
+      },
+      uploadCardAttachment: async (
+        cardId: number,
+        file: File,
+        entityType: string = 'Card'
+      ): Promise<any> => {
+        const formData = new FormData();
+        formData.append('file', file);
+        formData.append('entity_type', entityType);
+        formData.append('entity_id', cardId.toString());
+
+        const response = await api.post(`/cards/${cardId}/attachments`, formData, {
+          headers: {
+            'Content-Type': 'multipart/form-data',
+          },
+        });
+        return response.data;
+      },
+      deleteFile: async (fileUuid: string): Promise<void> => {
+        await api.delete(`/files/${fileUuid}`);
+      },
+      getSecureImage: async (url: string): Promise<Blob> => {
+        const response = await api.get(url, {
+          responseType: 'blob',
+        });
+        return response.data;
+      },
+
+      // Epics
+      getEpics: async (boardId: number): Promise<any> => {
+        const response = await api.get(`/boards/${boardId}/epics`);
+        return response.data;
+      },
+      createEpic: async (boardId: number, epicData: any): Promise<any> => {
+        const response = await api.post(`/boards/${boardId}/epics`, epicData);
+        return response.data;
+      },
+      getEpic: async (epicId: number): Promise<any> => {
+        const response = await api.get(`/epics/${epicId}`);
+        return response.data;
+      },
+      updateEpic: async (epicId: number, epicData: any): Promise<any> => {
+        const response = await api.put(`/epics/${epicId}`, epicData);
+        return response.data;
+      },
+      deleteEpic: async (epicId: number): Promise<void> => {
+        await api.delete(`/epics/${epicId}`);
+      },
+      addEpicToCard: async (cardId: number, epicId: number): Promise<any> => {
+        const response = await api.post(`/cards/${cardId}/epics`, { epic_id: epicId });
+        return response.data;
+      },
+      removeEpicFromCard: async (cardId: number, epicId: number): Promise<void> => {
+        await api.delete(`/cards/${cardId}/epics/${epicId}`);
+      },
+
+      // Wikis
+      getWikis: async (boardId: number): Promise<any> => {
+        const response = await api.get(`/boards/${boardId}/wikis`);
+        return response.data;
+      },
+      createWiki: async (boardId: number, wikiData: any): Promise<any> => {
+        const response = await api.post(`/boards/${boardId}/wikis`, wikiData);
+        return response.data;
+      },
+      getWiki: async (wikiId: number): Promise<any> => {
+        const response = await api.get(`/wikis/${wikiId}`);
+        return response.data;
+      },
+      updateWiki: async (wikiId: number, wikiData: any): Promise<any> => {
+        const response = await api.put(`/wikis/${wikiId}`, wikiData);
+        return response.data;
+      },
+      deleteWiki: async (wikiId: number): Promise<void> => {
+        await api.delete(`/wikis/${wikiId}`);
+      },
     }),
     []
   );

frontend/src/hooks/useAuth.ts

@@ -45,7 +45,6 @@ export function useAuth() {
     } catch (err: any) {
       const errorMessage =
         err.response?.data.error || err.message || 'Login failed. Please try again.';
-      // debugger
       // Show error toast
       addNotification({
         type: 'error',
@@ -76,7 +75,6 @@ export function useAuth() {
       };
 
       // Store in localStorage first
-      // debugger
       localStorage.setItem('token', response.access_token);
       localStorage.setItem('user', JSON.stringify(user));
 

frontend/src/hooks/useEpicDetail.ts

@@ -0,0 +1,105 @@
+import { useState, useEffect, useCallback } from 'react';
+import { useApi } from './useApi';
+import { useLoader } from '../context/loaders/useLoader';
+import { useToast } from '../context/toasts/useToast';
+import type { Epic, UpdateEpicRequest } from '../types/epic';
+
+function useEpicDetail(epicId: string) {
+  const [epic, setEpic] = useState<Epic | null>(null);
+  const [error, setError] = useState<Error | null>(null);
+
+  const { getEpic, updateEpic: apiUpdateEpic, deleteEpic: apiDeleteEpic } = useApi();
+  const { withLoader } = useLoader();
+  const { addNotification } = useToast();
+
+  const fetchEpic = useCallback(async () => {
+    try {
+      setError(null);
+      const data = await withLoader(() => getEpic(Number(epicId)), 'Loading epic...');
+      setEpic(data);
+      return data;
+    } catch (err) {
+      const errorMessage = err instanceof Error ? err.message : 'Failed to load epic';
+      setError(err instanceof Error ? err : new Error(errorMessage));
+      addNotification({
+        type: 'error',
+        title: 'Error Loading Epic',
+        message: errorMessage,
+        duration: 5000,
+      });
+      return null;
+    }
+  }, [epicId, getEpic, withLoader, addNotification]);
+
+  const updateEpic = useCallback(
+    async (epicData: UpdateEpicRequest) => {
+      try {
+        setError(null);
+        const updatedEpic = await withLoader(
+          () => apiUpdateEpic(Number(epicId), epicData),
+          'Updating epic...'
+        );
+        setEpic(updatedEpic);
+        addNotification({
+          type: 'success',
+          title: 'Epic Updated',
+          message: 'Epic updated successfully.',
+          duration: 3000,
+        });
+        return updatedEpic;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to update epic';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Updating Epic',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [epicId, apiUpdateEpic, withLoader, addNotification]
+  );
+
+  const deleteEpic = useCallback(async () => {
+    try {
+      setError(null);
+      await withLoader(() => apiDeleteEpic(Number(epicId)), 'Deleting epic...');
+      addNotification({
+        type: 'success',
+        title: 'Epic Deleted',
+        message: 'Epic deleted successfully.',
+        duration: 3000,
+      });
+      return true;
+    } catch (err) {
+      const errorMessage = err instanceof Error ? err.message : 'Failed to delete epic';
+      setError(err instanceof Error ? err : new Error(errorMessage));
+      addNotification({
+        type: 'error',
+        title: 'Error Deleting Epic',
+        message: errorMessage,
+        duration: 5000,
+      });
+      throw err;
+    }
+  }, [epicId, apiDeleteEpic, withLoader, addNotification]);
+
+  useEffect(() => {
+    if (epicId) {
+      fetchEpic();
+    }
+  }, [epicId, fetchEpic]);
+
+  return {
+    epic,
+    error, // For debugging, not for UI display
+    loading: false, // Loading is handled by global loader
+    updateEpic,
+    deleteEpic,
+    refetch: fetchEpic,
+  };
+}
+
+export default useEpicDetail;

frontend/src/hooks/useEpics.ts

@@ -0,0 +1,144 @@
+import { useState, useEffect, useCallback } from 'react';
+import { useApi } from './useApi';
+import { useLoader } from '../context/loaders/useLoader';
+import { useToast } from '../context/toasts/useToast';
+import type { Epic, CreateEpicRequest, UpdateEpicRequest } from '../types/epic';
+
+function useEpics(boardId: string) {
+  const [epics, setEpics] = useState<Epic[]>([]);
+  const [error, setError] = useState<Error | null>(null);
+
+  const {
+    getEpics,
+    createEpic: apiCreateEpic,
+    updateEpic: apiUpdateEpic,
+    deleteEpic: apiDeleteEpic,
+  } = useApi();
+  const { withLoader } = useLoader();
+  const { addNotification } = useToast();
+
+  const fetchEpics = useCallback(async () => {
+    try {
+      setError(null);
+      const data = await withLoader(() => getEpics(Number(boardId)), 'Loading epics...');
+      setEpics(data);
+      return data;
+    } catch (err) {
+      const errorMessage = err instanceof Error ? err.message : 'Failed to load epics';
+      setError(err instanceof Error ? err : new Error(errorMessage));
+      addNotification({
+        type: 'error',
+        title: 'Error Loading Epics',
+        message: errorMessage,
+        duration: 5000,
+      });
+      return [];
+    }
+  }, [boardId, getEpics, withLoader, addNotification]);
+
+  const createEpic = useCallback(
+    async (epicData: CreateEpicRequest) => {
+      try {
+        setError(null);
+        const newEpic = await withLoader(
+          () => apiCreateEpic(Number(boardId), epicData),
+          'Creating epic...'
+        );
+        setEpics((prev) => [...prev, newEpic]);
+        addNotification({
+          type: 'success',
+          title: 'Epic Created',
+          message: `Epic "${epicData.name}" created successfully.`,
+          duration: 3000,
+        });
+        return newEpic;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to create epic';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Creating Epic',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [boardId, apiCreateEpic, withLoader, addNotification]
+  );
+
+  const updateEpic = useCallback(
+    async (epicId: number, epicData: UpdateEpicRequest) => {
+      try {
+        setError(null);
+        const updatedEpic = await withLoader(
+          () => apiUpdateEpic(epicId, epicData),
+          'Updating epic...'
+        );
+        setEpics((prev) => prev.map((epic) => (epic.id === epicId ? updatedEpic : epic)));
+        addNotification({
+          type: 'success',
+          title: 'Epic Updated',
+          message: 'Epic updated successfully.',
+          duration: 3000,
+        });
+        return updatedEpic;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to update epic';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Updating Epic',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [apiUpdateEpic, withLoader, addNotification]
+  );
+
+  const deleteEpic = useCallback(
+    async (epicId: number) => {
+      try {
+        setError(null);
+        await withLoader(() => apiDeleteEpic(epicId), 'Deleting epic...');
+        setEpics((prev) => prev.filter((epic) => epic.id !== epicId));
+        addNotification({
+          type: 'success',
+          title: 'Epic Deleted',
+          message: 'Epic deleted successfully.',
+          duration: 3000,
+        });
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to delete epic';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Deleting Epic',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [apiDeleteEpic, withLoader, addNotification]
+  );
+
+  useEffect(() => {
+    fetchEpics();
+  }, [fetchEpics]);
+
+  return {
+    epics,
+    error, // For debugging, not for UI display
+    loading: false, // Loading is handled by global loader
+    fetchEpics,
+    createEpic,
+    updateEpic,
+    deleteEpic,
+    refetch: fetchEpics,
+  };
+}
+
+export default useEpics;

frontend/src/hooks/useFileAttachments.ts

@@ -0,0 +1,129 @@
+import { useState, useEffect, useCallback } from 'react';
+import { useApi } from './useApi';
+import { useLoader } from '../context/loaders/useLoader';
+import { useToast } from '../context/toasts/useToast';
+import { FileAttachment } from '../types/kanban';
+
+export function useFileAttachments(cardId?: number) {
+  const [attachments, setAttachments] = useState<FileAttachment[]>([]);
+  const [error, setError] = useState<Error | null>(null);
+
+  const { getCardAttachments, uploadCardAttachment, deleteFile } = useApi();
+  const { withLoader } = useLoader();
+  const { addNotification } = useToast();
+
+  const fetchAttachments = useCallback(async () => {
+    if (!cardId) {
+      return [];
+    }
+    try {
+      setError(null);
+      const data = await withLoader(() => getCardAttachments(cardId), 'Loading attachments...');
+      setAttachments(data.files || []);
+      return data.files || [];
+    } catch (err) {
+      const errorMessage = err instanceof Error ? err.message : 'Failed to load attachments';
+      setError(err instanceof Error ? err : new Error(errorMessage));
+      addNotification({
+        type: 'error',
+        title: 'Error Loading Attachments',
+        message: errorMessage,
+        duration: 5000,
+      });
+      return [];
+    }
+  }, [getCardAttachments, cardId, withLoader, addNotification]);
+
+  const uploadFile = useCallback(
+    async (file: File) => {
+      if (!cardId) {
+        return null;
+      }
+      try {
+        setError(null);
+
+        // Validate file size (10MB for images, 50MB for documents)
+        const maxSize = file.type.startsWith('image/') ? 10 * 1024 * 1024 : 50 * 1024 * 1024;
+        if (file.size > maxSize) {
+          const maxSizeMB = file.type.startsWith('image/') ? '10MB' : '50MB';
+          throw new Error(`File size exceeds ${maxSizeMB} limit`);
+        }
+
+        const data = await withLoader(
+          () => uploadCardAttachment(cardId, file, 'Card'),
+          'Uploading file...'
+        );
+
+        // Add new attachment to state
+        setAttachments((prev) => [...prev, data]);
+
+        addNotification({
+          type: 'success',
+          title: 'File Uploaded',
+          message: `Successfully uploaded ${file.name}`,
+          duration: 3000,
+        });
+
+        return data;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to upload file';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Upload Failed',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [uploadCardAttachment, cardId, withLoader, addNotification]
+  );
+
+  const deleteAttachment = useCallback(
+    async (fileUuid: string) => {
+      try {
+        setError(null);
+        await withLoader(() => deleteFile(fileUuid), 'Deleting file...');
+
+        // Remove attachment from state
+        setAttachments((prev) => prev.filter((a) => a.uuid !== fileUuid));
+
+        addNotification({
+          type: 'success',
+          title: 'File Deleted',
+          message: 'File deleted successfully',
+          duration: 3000,
+        });
+
+        return true;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to delete file';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Delete Failed',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [deleteFile, withLoader, addNotification]
+  );
+
+  useEffect(() => {
+    if (cardId) {
+      fetchAttachments();
+    }
+  }, [cardId, fetchAttachments]);
+
+  return {
+    attachments,
+    error, // For debugging, not for UI display
+    loading: false, // Loading is handled by global loader
+    refetch: fetchAttachments,
+    uploadFile,
+    deleteAttachment,
+  };
+}

frontend/src/hooks/useSecureImage.ts

@@ -0,0 +1,51 @@
+import { useState, useEffect, useCallback } from 'react';
+import { useApi } from './useApi';
+
+interface UseSecureImageReturn {
+  imageUrl: string | null;
+  loading: boolean;
+  error: Error | null;
+}
+
+export function useSecureImage(url: string): UseSecureImageReturn {
+  const [imageUrl, setImageUrl] = useState<string | null>(null);
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<Error | null>(null);
+
+  const { getSecureImage } = useApi();
+
+  const fetchImage = useCallback(async () => {
+    if (!url) {
+      setLoading(false);
+      return;
+    }
+
+    try {
+      setLoading(true);
+      setError(null);
+
+      // Fetch image with authentication
+      const blob = await getSecureImage(url);
+
+      // Create blob URL
+      const blobUrl = URL.createObjectURL(blob);
+      setImageUrl(blobUrl);
+    } catch (err) {
+      console.error('Error fetching image:', err);
+      const errorMessage = err instanceof Error ? err.message : 'Failed to load image';
+      setError(new Error(errorMessage));
+    } finally {
+      setLoading(false);
+    }
+  }, [url, getSecureImage]);
+
+  useEffect(() => {
+    fetchImage();
+  }, [fetchImage]);
+
+  return {
+    imageUrl,
+    loading,
+    error, // For debugging
+  };
+}

frontend/src/hooks/useWikiDetail.ts

@@ -0,0 +1,105 @@
+import { useState, useEffect, useCallback } from 'react';
+import { useApi } from './useApi';
+import { useLoader } from '../context/loaders/useLoader';
+import { useToast } from '../context/toasts/useToast';
+import type { Wiki, UpdateWikiRequest } from '../types/epic';
+
+function useWikiDetail(wikiId: string) {
+  const [wiki, setWiki] = useState<Wiki | null>(null);
+  const [error, setError] = useState<Error | null>(null);
+
+  const { getWiki, updateWiki: apiUpdateWiki, deleteWiki: apiDeleteWiki } = useApi();
+  const { withLoader } = useLoader();
+  const { addNotification } = useToast();
+
+  const fetchWiki = useCallback(async () => {
+    try {
+      setError(null);
+      const data = await withLoader(() => getWiki(Number(wikiId)), 'Loading wiki...');
+      setWiki(data);
+      return data;
+    } catch (err) {
+      const errorMessage = err instanceof Error ? err.message : 'Failed to load wiki';
+      setError(err instanceof Error ? err : new Error(errorMessage));
+      addNotification({
+        type: 'error',
+        title: 'Error Loading Wiki',
+        message: errorMessage,
+        duration: 5000,
+      });
+      return null;
+    }
+  }, [wikiId, getWiki, withLoader, addNotification]);
+
+  const updateWiki = useCallback(
+    async (wikiData: UpdateWikiRequest) => {
+      try {
+        setError(null);
+        const updatedWiki = await withLoader(
+          () => apiUpdateWiki(Number(wikiId), wikiData),
+          'Updating wiki...'
+        );
+        setWiki(updatedWiki);
+        addNotification({
+          type: 'success',
+          title: 'Wiki Updated',
+          message: 'Wiki updated successfully.',
+          duration: 3000,
+        });
+        return updatedWiki;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to update wiki';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Updating Wiki',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [wikiId, apiUpdateWiki, withLoader, addNotification]
+  );
+
+  const deleteWiki = useCallback(async () => {
+    try {
+      setError(null);
+      await withLoader(() => apiDeleteWiki(Number(wikiId)), 'Deleting wiki...');
+      addNotification({
+        type: 'success',
+        title: 'Wiki Deleted',
+        message: 'Wiki deleted successfully.',
+        duration: 3000,
+      });
+      return true;
+    } catch (err) {
+      const errorMessage = err instanceof Error ? err.message : 'Failed to delete wiki';
+      setError(err instanceof Error ? err : new Error(errorMessage));
+      addNotification({
+        type: 'error',
+        title: 'Error Deleting Wiki',
+        message: errorMessage,
+        duration: 5000,
+      });
+      throw err;
+    }
+  }, [wikiId, apiDeleteWiki, withLoader, addNotification]);
+
+  useEffect(() => {
+    if (wikiId) {
+      fetchWiki();
+    }
+  }, [wikiId, fetchWiki]);
+
+  return {
+    wiki,
+    error, // For debugging, not for UI display
+    loading: false, // Loading is handled by global loader
+    updateWiki,
+    deleteWiki,
+    refetch: fetchWiki,
+  };
+}
+
+export default useWikiDetail;

frontend/src/hooks/useWikis.ts

@@ -0,0 +1,144 @@
+import { useState, useEffect, useCallback } from 'react';
+import { useApi } from './useApi';
+import { useLoader } from '../context/loaders/useLoader';
+import { useToast } from '../context/toasts/useToast';
+import type { Wiki, CreateWikiRequest, UpdateWikiRequest } from '../types/epic';
+
+function useWikis(boardId: string) {
+  const [wikis, setWikis] = useState<Wiki[]>([]);
+  const [error, setError] = useState<Error | null>(null);
+
+  const {
+    getWikis,
+    createWiki: apiCreateWiki,
+    updateWiki: apiUpdateWiki,
+    deleteWiki: apiDeleteWiki,
+  } = useApi();
+  const { withLoader } = useLoader();
+  const { addNotification } = useToast();
+
+  const fetchWikis = useCallback(async () => {
+    try {
+      setError(null);
+      const data = await withLoader(() => getWikis(Number(boardId)), 'Loading wikis...');
+      setWikis(data);
+      return data;
+    } catch (err) {
+      const errorMessage = err instanceof Error ? err.message : 'Failed to load wikis';
+      setError(err instanceof Error ? err : new Error(errorMessage));
+      addNotification({
+        type: 'error',
+        title: 'Error Loading Wikis',
+        message: errorMessage,
+        duration: 5000,
+      });
+      return [];
+    }
+  }, [boardId, getWikis, withLoader, addNotification]);
+
+  const createWiki = useCallback(
+    async (wikiData: CreateWikiRequest) => {
+      try {
+        setError(null);
+        const newWiki = await withLoader(
+          () => apiCreateWiki(Number(boardId), wikiData),
+          'Creating wiki...'
+        );
+        setWikis((prev) => [...prev, newWiki]);
+        addNotification({
+          type: 'success',
+          title: 'Wiki Created',
+          message: `Wiki "${wikiData.name}" created successfully.`,
+          duration: 3000,
+        });
+        return newWiki;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to create wiki';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Creating Wiki',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [boardId, apiCreateWiki, withLoader, addNotification]
+  );
+
+  const updateWiki = useCallback(
+    async (wikiId: number, wikiData: UpdateWikiRequest) => {
+      try {
+        setError(null);
+        const updatedWiki = await withLoader(
+          () => apiUpdateWiki(wikiId, wikiData),
+          'Updating wiki...'
+        );
+        setWikis((prev) => prev.map((wiki) => (wiki.id === wikiId ? updatedWiki : wiki)));
+        addNotification({
+          type: 'success',
+          title: 'Wiki Updated',
+          message: 'Wiki updated successfully.',
+          duration: 3000,
+        });
+        return updatedWiki;
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to update wiki';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Updating Wiki',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [apiUpdateWiki, withLoader, addNotification]
+  );
+
+  const deleteWiki = useCallback(
+    async (wikiId: number) => {
+      try {
+        setError(null);
+        await withLoader(() => apiDeleteWiki(wikiId), 'Deleting wiki...');
+        setWikis((prev) => prev.filter((wiki) => wiki.id !== wikiId));
+        addNotification({
+          type: 'success',
+          title: 'Wiki Deleted',
+          message: 'Wiki deleted successfully.',
+          duration: 3000,
+        });
+      } catch (err) {
+        const errorMessage = err instanceof Error ? err.message : 'Failed to delete wiki';
+        setError(err instanceof Error ? err : new Error(errorMessage));
+        addNotification({
+          type: 'error',
+          title: 'Error Deleting Wiki',
+          message: errorMessage,
+          duration: 5000,
+        });
+        throw err;
+      }
+    },
+    [apiDeleteWiki, withLoader, addNotification]
+  );
+
+  useEffect(() => {
+    fetchWikis();
+  }, [fetchWikis]);
+
+  return {
+    wikis,
+    error, // For debugging, not for UI display
+    loading: false, // Loading is handled by global loader
+    fetchWikis,
+    createWiki,
+    updateWiki,
+    deleteWiki,
+    refetch: fetchWikis,
+  };
+}
+
+export default useWikis;

frontend/src/pages/BoardDetail.tsx

@@ -5,6 +5,7 @@ import { useListMutations } from '../hooks/useListMutations';
 import { SortableKanbanColumn } from '../components/kanban/SortableKanbanColumn';
 import { CreateListModal } from '../components/kanban/CreateListModal';
 import { CardPreviewModal } from '../components/CardPreviewModal';
+import { BoardSidebar } from '../components/BoardSidebar';
 import { useModal } from '../context/modals/useModal';
 import {
   DndContext,
@@ -20,6 +21,7 @@ import {
 import { SortableContext, horizontalListSortingStrategy } from '@dnd-kit/sortable';
 import { Card as CardType, ListWithCards } from '../types/kanban';
 import { useState } from 'react';
+import { WidePageLayout } from '@/components/WidePageLayout';
 
 export function BoardDetail() {
   const { id } = useParams<{ id: string }>();
@@ -65,12 +67,8 @@ export function BoardDetail() {
   const handleDragOver = (event: DragOverEvent) => {
     const { active, over } = event;
 
-    // console.log('---handleDragOver', event);
     if (!over) return;
 
-    // const activeId = parseInt(active.id as string);
-    // const overId = parseInt(over.id as string);
-
     const overIdStr = (over.id as string).split('_')[1];
     const overId = parseInt(overIdStr, 10);
     const activeIdStr = (active.id as string).split('_')[1];
@@ -105,8 +103,6 @@ export function BoardDetail() {
 
     // Handle column reordering
     if (activeType === 'COLUMN') {
-      // todo find over column id,
-
       let overListIndex = -1;
       const activeList = board.lists.find((l) => l.id === activeId);
       if (overType === 'CARD') {
@@ -118,12 +114,7 @@ export function BoardDetail() {
         overListIndex = board.lists.findIndex((l) => l.id === overId);
       }
 
-      // console.log('-------active.id', active.id)
-      // console.log('-------overType.id', overType)
-      // console.log('-------overListIndex', overListIndex)
-
       const activeListIndex = board.lists.findIndex((l) => l.id === activeId);
-      // overListIndex = board.lists.findIndex((l) => l.id === overId);
 
       if (activeListIndex === -1 || overListIndex === -1 || !activeList) return;
 
@@ -133,15 +124,6 @@ export function BoardDetail() {
       reorderedLists.splice(overListIndex, 0, movedList);
 
       await updateList(activeList.id, { name: activeList.name, pos: overListIndex });
-
-      // // Update all list positions
-      // for (let i = 0; i < reorderedLists.length; i++) {
-      //   const list = reorderedLists[i];
-      //   if (list.pos !== i) {
-      //     await updateList(list.id, { name: list.name, pos: i });
-      //   }
-      // }
-
       return;
     }
 
@@ -236,6 +218,7 @@ export function BoardDetail() {
 
   return (
     <div className="space-y-6">
+      <WidePageLayout>
         <div className="flex justify-between items-start">
           <div>
             <Link to="/boards" className="text-gray-400 hover:text-white transition-colors text-sm">
@@ -259,7 +242,11 @@ export function BoardDetail() {
             </button>
           </div>
         </div>
+      </WidePageLayout>
 
+      <div className="px-4 sm:px-6 lg:px-8 max-h-[calc(100vh-280px)] overflow-auto">
+        <div className="flex justify-between items-start gap-6">
+          <div className="flex-1">
             <DndContext
               sensors={sensors}
               collisionDetection={closestCenter}
@@ -302,5 +289,10 @@ export function BoardDetail() {
               </DragOverlay>
             </DndContext>
           </div>
+
+          <BoardSidebar boardId={id || ''} />
+        </div>
+      </div>
+    </div>
   );
 }

frontend/src/pages/BoardEpics.tsx

@@ -0,0 +1,236 @@
+import { useParams, Link, useNavigate } from 'react-router-dom';
+import { WidePageLayout } from '../components/WidePageLayout';
+import useEpics from '../hooks/useEpics';
+import RichTextContent from '../components/RichTextContent';
+import type { Epic } from '../types/epic';
+
+const PlusIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <line x1="12" y1="5" x2="12" y2="19"></line>
+    <line x1="5" y1="12" x2="19" y2="12"></line>
+  </svg>
+);
+
+const Edit2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path>
+  </svg>
+);
+
+const Trash2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <polyline points="3 6 5 6 21 6"></polyline>
+    <path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"></path>
+  </svg>
+);
+
+export function BoardEpics() {
+  const { id } = useParams<{ id: string }>();
+  const navigate = useNavigate();
+  const { epics, deleteEpic } = useEpics(id || '0');
+
+  const handleDeleteEpic = async (epicId: number, epicName: string) => {
+    if (confirm(`Are you sure you want to delete epic "${epicName}"?`)) {
+      try {
+        await deleteEpic(epicId);
+      } catch {
+        // Error is handled by the hook
+      }
+    }
+  };
+
+  return (
+    <div className="space-y-6">
+      <WidePageLayout>
+        <div className="flex items-center justify-between">
+          <div>
+            <Link
+              to={`/boards/${id}`}
+              className="text-gray-400 hover:text-white transition-colors text-sm"
+            >
+              ← Back to Board
+            </Link>
+            <h1 className="text-3xl font-bold text-white mt-2">Epics</h1>
+            <p className="text-gray-400 mt-1">
+              Manage and view epics for this board ({epics.length} epics)
+            </p>
+          </div>
+          <Link
+            to={`/boards/${id}/epics/new`}
+            className="bg-blue-600 hover:bg-blue-700 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
+          >
+            <span className="w-4 h-4">
+              <PlusIcon />
+            </span>
+            Create Epic
+          </Link>
+        </div>
+      </WidePageLayout>
+
+      <WidePageLayout>
+        {epics.length === 0 ? (
+          <div className="bg-gray-800 rounded-lg p-8 border border-gray-700">
+            <div className="text-center py-12">
+              <div className="text-6xl mb-4">📋</div>
+              <h2 className="text-xl font-bold text-white mb-2">No Epics Yet</h2>
+              <p className="text-gray-400 mb-6">
+                Create your first epic to start organizing your work.
+              </p>
+              <Link
+                to={`/boards/${id}/epics/new`}
+                className="bg-blue-600 hover:bg-blue-700 text-white px-6 py-2 rounded-lg inline-flex items-center gap-2 transition-colors"
+              >
+                <span className="w-4 h-4">
+                  <PlusIcon />
+                </span>
+                Create First Epic
+              </Link>
+            </div>
+          </div>
+        ) : (
+          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+            {epics.map((epic) => (
+              <EpicCard
+                key={epic.id}
+                epic={epic}
+                onClick={() => navigate(`/boards/${id}/epics/${epic.id}`)}
+                onDelete={() => handleDeleteEpic(epic.id, epic.name)}
+                onEdit={() => navigate(`/boards/${id}/epics/${epic.id}/edit`)}
+              />
+            ))}
+          </div>
+        )}
+      </WidePageLayout>
+    </div>
+  );
+}
+
+interface EpicCardProps {
+  epic: Epic;
+  onClick: () => void;
+  onDelete: () => void;
+  onEdit: () => void;
+}
+
+function EpicCard({ epic, onClick, onDelete, onEdit }: EpicCardProps) {
+  const defaultColor = '#3b82f6';
+  const color = epic.color || defaultColor;
+
+  return (
+    <div
+      className="bg-gray-800 rounded-lg border border-gray-700 hover:border-gray-600 transition-all cursor-pointer overflow-hidden group"
+      onClick={onClick}
+    >
+      {/* Color header */}
+      <div className="h-2" style={{ backgroundColor: color }} />
+
+      <div className="p-4">
+        {/* Header with actions */}
+        <div className="flex items-start justify-between mb-2">
+          <h3 className="text-lg font-semibold text-white flex-1">{epic.name}</h3>
+          <div className="flex gap-2 opacity-0 group-hover:opacity-100 transition-opacity">
+            <button
+              onClick={(e) => {
+                e.stopPropagation();
+                onEdit();
+              }}
+              className="text-gray-400 hover:text-white transition-colors p-1"
+              title="Edit epic"
+            >
+              <span className="w-4 h-4">
+                <Edit2Icon />
+              </span>
+            </button>
+            <button
+              onClick={(e) => {
+                e.stopPropagation();
+                onDelete();
+              }}
+              className="text-gray-400 hover:text-red-400 transition-colors p-1"
+              title="Delete epic"
+            >
+              <span className="w-4 h-4">
+                <Trash2Icon />
+              </span>
+            </button>
+          </div>
+        </div>
+
+        {/* Description */}
+        {epic.description && (
+          <p className="text-gray-400 text-sm mb-3 line-clamp-2">{epic.description}</p>
+        )}
+
+        {/* Rich text content preview */}
+        {epic.content && Array.isArray(epic.content) && epic.content.length > 0 && (
+          <div className="mb-3">
+            <RichTextContent
+              content={epic.content}
+              className="text-sm text-gray-400 line-clamp-3"
+            />
+          </div>
+        )}
+
+        {/* Footer with metrics */}
+        <div className="flex items-center justify-between text-xs text-gray-500 mt-3 pt-3 border-t border-gray-700">
+          <div className="flex items-center gap-4">
+            <span className="flex items-center gap-1">
+              <span>📊</span>
+              {epic.metrics?.card_count || 0} cards
+            </span>
+            {epic.parent_epic_id && (
+              <span className="flex items-center gap-1">
+                <span>🔄</span>
+                Sub-epic
+              </span>
+            )}
+          </div>
+          {epic.date_last_activity && (
+            <span>{new Date(epic.date_last_activity).toLocaleDateString()}</span>
+          )}
+        </div>
+
+        {/* Closed badge */}
+        {epic.closed && (
+          <div className="mt-3">
+            <span className="inline-block px-2 py-1 bg-gray-700 text-gray-400 text-xs rounded">
+              Closed
+            </span>
+          </div>
+        )}
+      </div>
+    </div>
+  );
+}
+
+export default BoardEpics;

frontend/src/pages/BoardWikis.tsx

@@ -0,0 +1,211 @@
+import { useParams, Link, useNavigate } from 'react-router-dom';
+import { WidePageLayout } from '../components/WidePageLayout';
+import RichTextContent from '../components/RichTextContent';
+import useWikis from '../hooks/useWikis';
+import type { Wiki } from '../types/epic';
+
+const PlusIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <line x1="12" y1="5" x2="12" y2="19"></line>
+    <line x1="5" y1="12" x2="19" y2="12"></line>
+  </svg>
+);
+
+const Edit2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path>
+  </svg>
+);
+
+const Trash2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <polyline points="3 6 5 6 21 6"></polyline>
+    <path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"></path>
+  </svg>
+);
+
+export function BoardWikis() {
+  const { id } = useParams<{ id: string }>();
+  const navigate = useNavigate();
+  const { wikis, deleteWiki } = useWikis(id || '0');
+
+  const handleDeleteWiki = async (wikiId: number, wikiName: string) => {
+    if (confirm(`Are you sure you want to delete wiki "${wikiName}"?`)) {
+      try {
+        await deleteWiki(wikiId);
+      } catch {
+        // Error is handled by the hook
+      }
+    }
+  };
+
+  return (
+    <div className="space-y-6">
+      <WidePageLayout>
+        <div className="flex items-center justify-between">
+          <div>
+            <Link
+              to={`/boards/${id}`}
+              className="text-gray-400 hover:text-white transition-colors text-sm"
+            >
+              ← Back to Board
+            </Link>
+            <h1 className="text-3xl font-bold text-white mt-2">Wikis</h1>
+            <p className="text-gray-400 mt-1">
+              Manage and view wikis for this board ({wikis.length} wikis)
+            </p>
+          </div>
+          <Link
+            to={`/boards/${id}/wikis/new`}
+            className="bg-blue-600 hover:bg-blue-700 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
+          >
+            <span className="w-4 h-4">
+              <PlusIcon />
+            </span>
+            Create Wiki
+          </Link>
+        </div>
+      </WidePageLayout>
+
+      <WidePageLayout>
+        {wikis.length === 0 ? (
+          <div className="bg-gray-800 rounded-lg p-8 border border-gray-700">
+            <div className="text-center py-12">
+              <div className="text-6xl mb-4">📚</div>
+              <h2 className="text-xl font-bold text-white mb-2">No Wikis Yet</h2>
+              <p className="text-gray-400 mb-6">
+                Create your first wiki to start documenting your knowledge.
+              </p>
+              <Link
+                to={`/boards/${id}/wikis/new`}
+                className="bg-blue-600 hover:bg-blue-700 text-white px-6 py-2 rounded-lg inline-flex items-center gap-2 transition-colors"
+              >
+                <span className="w-4 h-4">
+                  <PlusIcon />
+                </span>
+                Create First Wiki
+              </Link>
+            </div>
+          </div>
+        ) : (
+          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-4">
+            {wikis.map((wiki) => (
+              <WikiCard
+                key={wiki.id}
+                wiki={wiki}
+                onClick={() => navigate(`/boards/${id}/wikis/${wiki.id}`)}
+                onDelete={() => handleDeleteWiki(wiki.id, wiki.name)}
+                onEdit={() => navigate(`/boards/${id}/wikis/${wiki.id}/edit`)}
+              />
+            ))}
+          </div>
+        )}
+      </WidePageLayout>
+    </div>
+  );
+}
+
+interface WikiCardProps {
+  wiki: Wiki;
+  onClick: () => void;
+  onDelete: () => void;
+  onEdit: () => void;
+}
+
+function WikiCard({ wiki, onClick, onDelete, onEdit }: WikiCardProps) {
+  return (
+    <div
+      className="bg-gray-800 rounded-lg border border-gray-700 hover:border-gray-600 transition-all cursor-pointer overflow-hidden group"
+      onClick={onClick}
+    >
+      <div className="p-4">
+        {/* Header with actions */}
+        <div className="flex items-start justify-between mb-2">
+          <h3 className="text-lg font-semibold text-white flex-1">{wiki.name}</h3>
+          <div className="flex gap-2 opacity-0 group-hover:opacity-100 transition-opacity">
+            <button
+              onClick={(e) => {
+                e.stopPropagation();
+                onEdit();
+              }}
+              className="text-gray-400 hover:text-white transition-colors p-1"
+              title="Edit wiki"
+            >
+              <span className="w-4 h-4">
+                <Edit2Icon />
+              </span>
+            </button>
+            <button
+              onClick={(e) => {
+                e.stopPropagation();
+                onDelete();
+              }}
+              className="text-gray-400 hover:text-red-400 transition-colors p-1"
+              title="Delete wiki"
+            >
+              <span className="w-4 h-4">
+                <Trash2Icon />
+              </span>
+            </button>
+          </div>
+        </div>
+
+        {/* Summary */}
+        {wiki.summary && <p className="text-gray-400 text-sm mb-3 line-clamp-2">{wiki.summary}</p>}
+
+        {/* Rich text content preview */}
+        {wiki.content && Array.isArray(wiki.content) && wiki.content.length > 0 && (
+          <div className="mb-3">
+            <RichTextContent
+              content={wiki.content}
+              className="text-sm text-gray-400 line-clamp-3"
+            />
+          </div>
+        )}
+
+        {/* Footer with metadata */}
+        <div className="flex items-center justify-between text-xs text-gray-500 mt-3 pt-3 border-t border-gray-700">
+          <div className="flex items-center gap-4">
+            {wiki.category && (
+              <span className="px-2 py-1 bg-gray-700 text-gray-400 rounded">{wiki.category}</span>
+            )}
+            {wiki.tags && wiki.tags.length > 0 && <span>{wiki.tags.length} tag(s)</span>}
+          </div>
+          {wiki.updated_at && <span>{new Date(wiki.updated_at).toLocaleDateString()}</span>}
+        </div>
+      </div>
+    </div>
+  );
+}
+
+export default BoardWikis;

frontend/src/pages/Boards.tsx

@@ -1,11 +1,13 @@
 import { Link } from 'react-router-dom';
 import { useBoards } from '../hooks/useBoards';
 import { BoardCard } from '../components/kanban/BoardCard';
+import { NarrowPageLayout } from '@/components/NarrowPageLayout';
 
 export function Boards() {
   const { boards, deleteBoard } = useBoards();
 
   return (
+    <NarrowPageLayout>
       <div className="space-y-6">
         <div className="flex justify-between items-center">
           <div>
@@ -38,5 +40,6 @@ export function Boards() {
           </div>
         )}
       </div>
+    </NarrowPageLayout>
   );
 }

frontend/src/pages/CardDetail.tsx

@@ -9,11 +9,13 @@ import { CardSidebar } from '../components/CardSidebar';
 import { CardComments } from '../components/CardComments';
 import { CardChecklists } from '../components/CardChecklists';
 import { CardLabels } from '../components/CardLabels';
+import { CardAttachments } from '../components/CardAttachments';
 import { EditCardModal } from '../components/EditCardModal';
 import { DeleteCardModal } from '../components/DeleteCardModal';
 import Trash2Icon from '../components/icons/Trash2Icon';
 import ArrowLeftIcon from '../components/icons/ArrowLeftIcon';
 import Edit2Icon from '../components/icons/Edit2Icon';
+import { NarrowPageLayout } from '@/components/NarrowPageLayout';
 
 export function CardDetail() {
   const { id: boardId, cardId } = useParams<{ id: string; cardId: string }>();
@@ -84,7 +86,7 @@ export function CardDetail() {
   };
 
   return (
-    <div className="space-y-6">
+    <NarrowPageLayout>
       <div className="flex justify-between items-start">
         <div>
           <Link
@@ -164,6 +166,8 @@ export function CardDetail() {
             removeCheckItem={checklistMutations.removeCheckItem}
           />
 
+          <CardAttachments cardId={cardId ? parseInt(cardId) : undefined} />
+
           <CardComments
             card={card}
             addComment={addComment}
@@ -175,6 +179,6 @@ export function CardDetail() {
 
         <CardSidebar card={card} />
       </div>
-    </div>
+    </NarrowPageLayout>
   );
 }

frontend/src/pages/CreateEpic.tsx

@@ -0,0 +1,203 @@
+import { useParams, Link, useNavigate } from 'react-router-dom';
+import { useState } from 'react';
+import { WidePageLayout } from '../components/WidePageLayout';
+import RichTextEditor from '../components/RichTextEditor';
+import useEpics from '../hooks/useEpics';
+import type { CreateEpicRequest } from '../types/epic';
+
+const CheckSquareIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="20"
+    height="20"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <polyline points="9 11 12 13 22 2"></polyline>
+    <path d="M21 12v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11"></path>
+  </svg>
+);
+
+const COLOR_PRESETS = [
+  '#ef4444', // Red
+  '#f97316', // Orange
+  '#eab308', // Yellow
+  '#22c55e', // Green
+  '#14b8a6', // Teal
+  '#3b82f6', // Blue
+  '#8b5cf6', // Purple
+  '#ec4899', // Pink
+  '#6b7280', // Gray
+];
+
+export function CreateEpic() {
+  const { id: boardId } = useParams<{ id: string }>();
+  const navigate = useNavigate();
+  const { createEpic } = useEpics(boardId || '0');
+
+  const [name, setName] = useState('');
+  const [description, setDescription] = useState('');
+  const [color, setColor] = useState(COLOR_PRESETS[5]); // Default to blue
+  const [content, setContent] = useState<any[]>([{ children: [{ text: '' }] }]);
+  const [parentEpicId, setParentEpicId] = useState<number | undefined>(undefined);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+
+    if (!name.trim()) {
+      return;
+    }
+
+    const epicData: CreateEpicRequest = {
+      name: name.trim(),
+      description: description.trim() || undefined,
+      content:
+        content.length > 1 || (content[0] as any).children[0].text !== ''
+          ? (content as unknown as Record<string, unknown>)
+          : undefined,
+      color,
+      parent_epic_id: parentEpicId,
+    };
+
+    try {
+      const newEpic = await createEpic(epicData);
+      navigate(`/boards/${boardId}/epics/${newEpic.id}`);
+    } catch {
+      // Error is handled by hook
+    }
+  };
+
+  return (
+    <div className="space-y-6">
+      <WidePageLayout>
+        <div>
+          <Link
+            to={`/boards/${boardId}/epics`}
+            className="text-gray-400 hover:text-white transition-colors text-sm"
+          >
+            ← Back to Epics
+          </Link>
+          <h1 className="text-3xl font-bold text-white mt-2">Create Epic</h1>
+          <p className="text-gray-400 mt-1">Create a new epic for this board</p>
+        </div>
+      </WidePageLayout>
+
+      <WidePageLayout>
+        <form onSubmit={handleSubmit} className="bg-gray-800 rounded-lg border border-gray-700 p-6">
+          {/* Name */}
+          <div className="mb-6">
+            <label htmlFor="name" className="block text-white font-medium mb-2">
+              Epic Name <span className="text-red-500">*</span>
+            </label>
+            <input
+              type="text"
+              id="name"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500"
+              placeholder="Enter epic name..."
+              required
+            />
+          </div>
+
+          {/* Description */}
+          <div className="mb-6">
+            <label htmlFor="description" className="block text-white font-medium mb-2">
+              Description
+            </label>
+            <textarea
+              id="description"
+              value={description}
+              onChange={(e) => setDescription(e.target.value)}
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500 resize-none"
+              rows={3}
+              placeholder="Brief description of this epic..."
+            />
+          </div>
+
+          {/* Color */}
+          <div className="mb-6">
+            <label className="block text-white font-medium mb-2">Color</label>
+            <div className="flex flex-wrap gap-3">
+              {COLOR_PRESETS.map((presetColor) => (
+                <button
+                  key={presetColor}
+                  type="button"
+                  onClick={() => setColor(presetColor)}
+                  className={`w-10 h-10 rounded-lg border-2 transition-all ${
+                    color === presetColor
+                      ? 'border-white ring-2 ring-white ring-opacity-50'
+                      : 'border-transparent hover:border-gray-500'
+                  }`}
+                  style={{ backgroundColor: presetColor }}
+                  title={presetColor}
+                />
+              ))}
+            </div>
+          </div>
+
+          {/* Rich Text Content */}
+          <div className="mb-6">
+            <label className="block text-white font-medium mb-2">Epic Details</label>
+            <RichTextEditor
+              value={content}
+              onChange={setContent}
+              placeholder="Add detailed information about this epic..."
+              className="border-0"
+            />
+            <p className="text-gray-500 text-xs mt-2">
+              Use the rich text editor to add formatted content, lists, and more.
+            </p>
+          </div>
+
+          {/* Parent Epic */}
+          <div className="mb-6">
+            <label htmlFor="parentEpic" className="block text-white font-medium mb-2">
+              Parent Epic
+            </label>
+            <select
+              id="parentEpic"
+              value={parentEpicId || ''}
+              onChange={(e) =>
+                setParentEpicId(e.target.value ? parseInt(e.target.value, 10) : undefined)
+              }
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500"
+            >
+              <option value="">No parent (top-level epic)</option>
+              {/* Parent epics would be loaded here */}
+            </select>
+            <p className="text-gray-500 text-xs mt-2">
+              Select a parent epic to create a hierarchy. Leave empty for a top-level epic.
+            </p>
+          </div>
+
+          {/* Action Buttons */}
+          <div className="flex gap-3 pt-4 border-t border-gray-700">
+            <Link
+              to={`/boards/${boardId}/epics`}
+              className="px-6 py-2 rounded-lg border border-gray-600 text-gray-300 hover:text-white hover:border-gray-500 transition-colors"
+            >
+              Cancel
+            </Link>
+            <button
+              type="submit"
+              disabled={!name.trim()}
+              className="flex-1 bg-blue-600 hover:bg-blue-700 disabled:bg-gray-600 disabled:cursor-not-allowed text-white px-6 py-2 rounded-lg flex items-center justify-center gap-2 transition-colors"
+            >
+              <span className="w-5 h-5">
+                <CheckSquareIcon />
+              </span>
+              Create Epic
+            </button>
+          </div>
+        </form>
+      </WidePageLayout>
+    </div>
+  );
+}
+
+export default CreateEpic;

frontend/src/pages/CreateWiki.tsx

@@ -0,0 +1,200 @@
+import { useParams, Link, useNavigate } from 'react-router-dom';
+import { useState } from 'react';
+import { WidePageLayout } from '../components/WidePageLayout';
+import RichTextEditor from '../components/RichTextEditor';
+import useWikis from '../hooks/useWikis';
+import type { CreateWikiRequest } from '../types/epic';
+
+const CheckSquareIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="20"
+    height="20"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <polyline points="9 11 12 13 22 2"></polyline>
+    <path d="M21 12v7a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h11"></path>
+  </svg>
+);
+
+export function CreateWiki() {
+  const { id: boardId } = useParams<{ id: string }>();
+  const navigate = useNavigate();
+  const { createWiki } = useWikis(boardId || '0');
+
+  const [name, setName] = useState('');
+  const [slug, setSlug] = useState('');
+  const [summary, setSummary] = useState('');
+  const [category, setCategory] = useState('');
+  const [tags, setTags] = useState('');
+  const [content, setContent] = useState<any[]>([{ children: [{ text: '' }] }]);
+
+  const handleSubmit = async (e: React.FormEvent) => {
+    e.preventDefault();
+
+    if (!name.trim()) {
+      return;
+    }
+
+    const wikiData: CreateWikiRequest = {
+      name: name.trim(),
+      slug: slug.trim() || undefined,
+      summary: summary.trim() || undefined,
+      content:
+        content.length > 1 || (content[0] as any).children[0].text !== ''
+          ? (content as unknown as Record<string, unknown>)
+          : { children: [{ text: '' }] },
+      category: category.trim() || undefined,
+      tags: tags.trim() ? tags.split(',').map((t) => t.trim()) : undefined,
+    };
+
+    try {
+      const newWiki = await createWiki(wikiData);
+      navigate(`/boards/${boardId}/wikis/${newWiki.id}`);
+    } catch {
+      // Error is handled by hook
+    }
+  };
+
+  return (
+    <div className="space-y-6">
+      <WidePageLayout>
+        <div>
+          <Link
+            to={`/boards/${boardId}/wikis`}
+            className="text-gray-400 hover:text-white transition-colors text-sm"
+          >
+            ← Back to Wikis
+          </Link>
+          <h1 className="text-3xl font-bold text-white mt-2">Create Wiki</h1>
+          <p className="text-gray-400 mt-1">Create a new wiki for this board</p>
+        </div>
+      </WidePageLayout>
+
+      <WidePageLayout>
+        <form onSubmit={handleSubmit} className="bg-gray-800 rounded-lg border border-gray-700 p-6">
+          {/* Name */}
+          <div className="mb-6">
+            <label htmlFor="name" className="block text-white font-medium mb-2">
+              Wiki Name <span className="text-red-500">*</span>
+            </label>
+            <input
+              type="text"
+              id="name"
+              value={name}
+              onChange={(e) => setName(e.target.value)}
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500"
+              placeholder="Enter wiki name..."
+              required
+            />
+          </div>
+
+          {/* Slug */}
+          <div className="mb-6">
+            <label htmlFor="slug" className="block text-white font-medium mb-2">
+              URL Slug (optional)
+            </label>
+            <input
+              type="text"
+              id="slug"
+              value={slug}
+              onChange={(e) => setSlug(e.target.value)}
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500"
+              placeholder="url-friendly-slug"
+            />
+            <p className="text-gray-500 text-xs mt-2">
+              Leave empty to auto-generate from name. Used in URLs.
+            </p>
+          </div>
+
+          {/* Summary */}
+          <div className="mb-6">
+            <label htmlFor="summary" className="block text-white font-medium mb-2">
+              Summary
+            </label>
+            <textarea
+              id="summary"
+              value={summary}
+              onChange={(e) => setSummary(e.target.value)}
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500 resize-none"
+              rows={3}
+              placeholder="Brief summary of this wiki..."
+            />
+          </div>
+
+          {/* Category */}
+          <div className="mb-6">
+            <label htmlFor="category" className="block text-white font-medium mb-2">
+              Category
+            </label>
+            <input
+              type="text"
+              id="category"
+              value={category}
+              onChange={(e) => setCategory(e.target.value)}
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500"
+              placeholder="e.g., Documentation, Guides, Tutorials"
+            />
+          </div>
+
+          {/* Tags */}
+          <div className="mb-6">
+            <label htmlFor="tags" className="block text-white font-medium mb-2">
+              Tags
+            </label>
+            <input
+              type="text"
+              id="tags"
+              value={tags}
+              onChange={(e) => setTags(e.target.value)}
+              className="w-full bg-gray-700 border border-gray-600 rounded-lg px-4 py-2 text-white focus:outline-none focus:border-blue-500"
+              placeholder="tag1, tag2, tag3"
+            />
+            <p className="text-gray-500 text-xs mt-2">Separate multiple tags with commas.</p>
+          </div>
+
+          {/* Rich Text Content */}
+          <div className="mb-6">
+            <label className="block text-white font-medium mb-2">Wiki Content</label>
+            <RichTextEditor
+              value={content}
+              onChange={setContent}
+              placeholder="Add detailed information to your wiki..."
+              className="border-0"
+            />
+            <p className="text-gray-500 text-xs mt-2">
+              Use the rich text editor to add formatted content, lists, and more.
+            </p>
+          </div>
+
+          {/* Action Buttons */}
+          <div className="flex gap-3 pt-4 border-t border-gray-700">
+            <Link
+              to={`/boards/${boardId}/wikis`}
+              className="px-6 py-2 rounded-lg border border-gray-600 text-gray-300 hover:text-white hover:border-gray-500 transition-colors"
+            >
+              Cancel
+            </Link>
+            <button
+              type="submit"
+              disabled={!name.trim()}
+              className="flex-1 bg-blue-600 hover:bg-blue-700 disabled:bg-gray-600 disabled:cursor-not-allowed text-white px-6 py-2 rounded-lg flex items-center justify-center gap-2 transition-colors"
+            >
+              <span className="w-5 h-5">
+                <CheckSquareIcon />
+              </span>
+              Create Wiki
+            </button>
+          </div>
+        </form>
+      </WidePageLayout>
+    </div>
+  );
+}
+
+export default CreateWiki;

frontend/src/pages/EpicDetail.tsx

@@ -0,0 +1,262 @@
+import { useParams, Link, useNavigate } from 'react-router-dom';
+import { WidePageLayout } from '../components/WidePageLayout';
+import RichTextContent from '../components/RichTextContent';
+import useEpicDetail from '../hooks/useEpicDetail';
+
+const Edit2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path>
+  </svg>
+);
+
+const Trash2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <polyline points="3 6 5 6 21 6"></polyline>
+    <path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"></path>
+  </svg>
+);
+
+const TagIcon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M20.59 13.41l-7.17 7.17a2 2 0 0 1-2.83 0L2 12V2h10l8.59 8.59a2 2 0 0 1 0 2.82z"></path>
+    <line x1="7" y1="7" x2="7.01" y2="7"></line>
+  </svg>
+);
+
+export function EpicDetail() {
+  const { id: boardId, epicId } = useParams<{ id: string; epicId: string }>();
+  const navigate = useNavigate();
+  const { epic, deleteEpic } = useEpicDetail(epicId || '0');
+
+  const handleDelete = async () => {
+    if (!epic) return;
+
+    if (confirm(`Are you sure you want to delete epic "${epic.name}"?`)) {
+      try {
+        await deleteEpic();
+        navigate(`/boards/${boardId}/epics`);
+      } catch {
+        // Error is already handled by the hook with toast
+      }
+    }
+  };
+
+  if (!epic) {
+    return (
+      <div className="space-y-6">
+        <WidePageLayout>
+          <div className="text-center py-12">
+            <div className="text-gray-400">Loading epic...</div>
+          </div>
+        </WidePageLayout>
+      </div>
+    );
+  }
+
+  const defaultColor = '#3b82f6';
+  const color = epic.color || defaultColor;
+
+  return (
+    <div className="space-y-6">
+      {/* Header */}
+      <WidePageLayout>
+        <div>
+          <Link
+            to={`/boards/${boardId}/epics`}
+            className="text-gray-400 hover:text-white transition-colors text-sm"
+          >
+            ← Back to Epics
+          </Link>
+          <div className="flex items-center justify-between mt-2">
+            <div className="flex items-center gap-3">
+              <div className="w-1 h-12 rounded" style={{ backgroundColor: color }} />
+              <div>
+                <h1 className="text-3xl font-bold text-white">{epic.name}</h1>
+                {epic.closed && (
+                  <span className="inline-block px-2 py-1 bg-gray-700 text-gray-400 text-xs rounded mt-1">
+                    Closed
+                  </span>
+                )}
+              </div>
+            </div>
+            <div className="flex gap-2">
+              <Link
+                to={`/boards/${boardId}/epics/${epic.id}/edit`}
+                className="bg-gray-700 hover:bg-gray-600 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
+              >
+                <span className="w-4 h-4">
+                  <Edit2Icon />
+                </span>
+                Edit
+              </Link>
+              <button
+                onClick={handleDelete}
+                className="bg-red-600 hover:bg-red-700 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
+              >
+                <span className="w-4 h-4">
+                  <Trash2Icon />
+                </span>
+                Delete
+              </button>
+            </div>
+          </div>
+        </div>
+      </WidePageLayout>
+
+      {/* Content */}
+      <WidePageLayout>
+        <div className="bg-gray-800 rounded-lg border border-gray-700 overflow-hidden">
+          {/* Color header bar */}
+          <div className="h-2" style={{ backgroundColor: color }} />
+
+          <div className="p-6">
+            {/* Description */}
+            {epic.description && (
+              <div className="mb-6">
+                <h2 className="text-lg font-semibold text-white mb-2">Description</h2>
+                <p className="text-gray-300">{epic.description}</p>
+              </div>
+            )}
+
+            {/* Rich Text Content */}
+            {epic.content && Array.isArray(epic.content) && epic.content.length > 0 && (
+              <div className="mb-6">
+                <h2 className="text-lg font-semibold text-white mb-2">Details</h2>
+                <div className="bg-gray-900 rounded-lg p-4 border border-gray-700">
+                  <RichTextContent content={epic.content} />
+                </div>
+              </div>
+            )}
+
+            {/* Metrics */}
+            <div className="mb-6 pt-6 border-t border-gray-700">
+              <h2 className="text-lg font-semibold text-white mb-3">Metrics</h2>
+              <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
+                <div className="bg-gray-900 rounded-lg p-4">
+                  <div className="flex items-center gap-2 text-gray-400 mb-1">
+                    <span>📊</span>
+                    <span className="text-sm">Cards</span>
+                  </div>
+                  <div className="text-2xl font-bold text-white">
+                    {epic.metrics?.card_count || 0}
+                  </div>
+                </div>
+                <div className="bg-gray-900 rounded-lg p-4">
+                  <div className="flex items-center gap-2 text-gray-400 mb-1">
+                    <span>📈</span>
+                    <span className="text-sm">Progress</span>
+                  </div>
+                  <div className="text-2xl font-bold text-white">
+                    {epic.metrics?.progress || 0}%
+                  </div>
+                </div>
+                {epic.depth_limit !== null && epic.depth_limit !== undefined && (
+                  <div className="bg-gray-900 rounded-lg p-4">
+                    <div className="flex items-center gap-2 text-gray-400 mb-1">
+                      <span>🔄</span>
+                      <span className="text-sm">Max Depth</span>
+                    </div>
+                    <div className="text-2xl font-bold text-white">{epic.depth_limit}</div>
+                  </div>
+                )}
+                {epic.parent_epic_id && (
+                  <div className="bg-gray-900 rounded-lg p-4">
+                    <div className="flex items-center gap-2 text-gray-400 mb-1">
+                      <span>🔗</span>
+                      <span className="text-sm">Parent</span>
+                    </div>
+                    <div className="text-lg font-bold text-white">Yes</div>
+                  </div>
+                )}
+              </div>
+            </div>
+
+            {/* Metadata */}
+            <div className="pt-6 border-t border-gray-700">
+              <h2 className="text-lg font-semibold text-white mb-3">Metadata</h2>
+              <div className="space-y-2 text-sm">
+                <div className="flex items-center gap-2">
+                  <span className="text-gray-400 w-24">Created:</span>
+                  <span className="text-gray-300">
+                    {epic.created_at ? new Date(epic.created_at).toLocaleString() : 'N/A'}
+                  </span>
+                </div>
+                <div className="flex items-center gap-2">
+                  <span className="text-gray-400 w-24">Updated:</span>
+                  <span className="text-gray-300">
+                    {epic.updated_at ? new Date(epic.updated_at).toLocaleString() : 'N/A'}
+                  </span>
+                </div>
+                {epic.date_last_activity && (
+                  <div className="flex items-center gap-2">
+                    <span className="text-gray-400 w-24">Last Activity:</span>
+                    <span className="text-gray-300">
+                      {new Date(epic.date_last_activity).toLocaleString()}
+                    </span>
+                  </div>
+                )}
+              </div>
+            </div>
+
+            {/* Links to Cards */}
+            <div className="pt-6 border-t border-gray-700 mt-6">
+              <div className="flex items-center justify-between mb-3">
+                <h2 className="text-lg font-semibold text-white">Linked Cards</h2>
+                <Link to={`/boards/${boardId}`} className="text-blue-500 hover:underline text-sm">
+                  View in Board →
+                </Link>
+              </div>
+              {epic.metrics?.card_count === 0 ? (
+                <div className="text-center py-8 text-gray-400">
+                  <div className="text-4xl mb-2">📭</div>
+                  <p>No cards linked to this epic yet</p>
+                </div>
+              ) : (
+                <div className="text-center py-8 text-gray-400">
+                  <div className="flex items-center justify-center gap-2">
+                    <span className="w-4 h-4">
+                      <TagIcon />
+                    </span>
+                    <span>{epic.metrics?.card_count} card(s) linked to this epic</span>
+                  </div>
+                </div>
+              )}
+            </div>
+          </div>
+        </div>
+      </WidePageLayout>
+    </div>
+  );
+}
+
+export default EpicDetail;

frontend/src/pages/Home.tsx

@@ -6,7 +6,7 @@ import { TaskboardLogo } from '../components/TaskboardLogo';
 
 export function Home() {
   return (
-    <div className="space-y-12">
+    <div className="space-y-12 flex-1 p-8 max-w-7xl mx-auto w-full">
       <div className="text-center py-12">
         <div className="flex justify-center mb-6">
           <TaskboardLogo className="h-16 w-auto" />

frontend/src/pages/WikiDetail.tsx

@@ -0,0 +1,202 @@
+import { useParams, Link, useNavigate } from 'react-router-dom';
+import { WidePageLayout } from '../components/WidePageLayout';
+import RichTextContent from '../components/RichTextContent';
+import useWikiDetail from '../hooks/useWikiDetail';
+
+const Edit2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <path d="M17 3a2.828 2.828 0 1 1 4 4L7.5 20.5 2 22l1.5-5.5L17 3z"></path>
+  </svg>
+);
+
+const Trash2Icon = () => (
+  <svg
+    xmlns="http://www.w3.org/2000/svg"
+    width="16"
+    height="16"
+    viewBox="0 0 24 24"
+    fill="none"
+    stroke="currentColor"
+    strokeWidth="2"
+    strokeLinecap="round"
+    strokeLinejoin="round"
+  >
+    <polyline points="3 6 5 6 21 6"></polyline>
+    <path d="M19 6v14a2 2 0 0 1-2 2H7a2 2 0 0 1-2-2V6m3 0V4a2 2 0 0 1 2-2h4a2 2 0 0 1 2 2v2"></path>
+  </svg>
+);
+
+export function WikiDetail() {
+  const { id: boardId, wikiId } = useParams<{ id: string; wikiId: string }>();
+  const navigate = useNavigate();
+  const { wiki, deleteWiki } = useWikiDetail(wikiId || '0');
+
+  const handleDelete = async () => {
+    if (!wiki) return;
+
+    if (confirm(`Are you sure you want to delete wiki "${wiki.name}"?`)) {
+      try {
+        await deleteWiki();
+        navigate(`/boards/${boardId}/wikis`);
+      } catch {
+        // Error is already handled by hook with toast
+      }
+    }
+  };
+
+  if (!wiki) {
+    return (
+      <div className="space-y-6">
+        <WidePageLayout>
+          <div className="text-center py-12">
+            <div className="text-gray-400">Loading wiki...</div>
+          </div>
+        </WidePageLayout>
+      </div>
+    );
+  }
+
+  return (
+    <div className="space-y-6">
+      {/* Header */}
+      <WidePageLayout>
+        <div>
+          <Link
+            to={`/boards/${boardId}/wikis`}
+            className="text-gray-400 hover:text-white transition-colors text-sm"
+          >
+            ← Back to Wikis
+          </Link>
+          <div className="flex items-center justify-between mt-2">
+            <div>
+              <h1 className="text-3xl font-bold text-white">{wiki.name}</h1>
+              {wiki.slug && <span className="text-gray-400 text-sm">/{wiki.slug}</span>}
+            </div>
+            <div className="flex gap-2">
+              <Link
+                to={`/boards/${boardId}/wikis/${wiki.id}/edit`}
+                className="bg-gray-700 hover:bg-gray-600 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
+              >
+                <span className="w-4 h-4">
+                  <Edit2Icon />
+                </span>
+                Edit
+              </Link>
+              <button
+                onClick={handleDelete}
+                className="bg-red-600 hover:bg-red-700 text-white px-4 py-2 rounded-lg flex items-center gap-2 transition-colors"
+              >
+                <span className="w-4 h-4">
+                  <Trash2Icon />
+                </span>
+                Delete
+              </button>
+            </div>
+          </div>
+        </div>
+      </WidePageLayout>
+
+      {/* Content */}
+      <WidePageLayout>
+        <div className="bg-gray-800 rounded-lg border border-gray-700 overflow-hidden">
+          <div className="p-6">
+            {/* Summary */}
+            {wiki.summary && (
+              <div className="mb-6 pb-6 border-b border-gray-700">
+                <h2 className="text-lg font-semibold text-white mb-2">Summary</h2>
+                <p className="text-gray-300">{wiki.summary}</p>
+              </div>
+            )}
+
+            {/* Rich Text Content */}
+            {wiki.content && Array.isArray(wiki.content) && wiki.content.length > 0 && (
+              <div className="mb-6 pb-6 border-b border-gray-700">
+                <h2 className="text-lg font-semibold text-white mb-2">Content</h2>
+                <div className="bg-gray-900 rounded-lg p-6 border border-gray-700">
+                  <RichTextContent content={wiki.content} />
+                </div>
+              </div>
+            )}
+
+            {/* Tags */}
+            {wiki.tags && wiki.tags.length > 0 && (
+              <div className="mb-6 pb-6 border-b border-gray-700">
+                <h2 className="text-lg font-semibold text-white mb-3">Tags</h2>
+                <div className="flex flex-wrap gap-2">
+                  {wiki.tags.map((tag, index) => (
+                    <span
+                      key={index}
+                      className="px-3 py-1 bg-blue-600 text-white text-sm rounded-full"
+                    >
+                      {tag}
+                    </span>
+                  ))}
+                </div>
+              </div>
+            )}
+
+            {/* Metadata */}
+            <div className="pt-6 border-t border-gray-700">
+              <h2 className="text-lg font-semibold text-white mb-3">Metadata</h2>
+              <div className="space-y-2 text-sm">
+                {wiki.category && (
+                  <div className="flex items-center gap-2">
+                    <span className="text-gray-400 w-24">Category:</span>
+                    <span className="px-2 py-1 bg-gray-700 text-gray-300 rounded text-sm">
+                      {wiki.category}
+                    </span>
+                  </div>
+                )}
+                {wiki.created_by && (
+                  <div className="flex items-center gap-2">
+                    <span className="text-gray-400 w-24">Created By:</span>
+                    <span className="text-gray-300">User #{wiki.created_by}</span>
+                  </div>
+                )}
+                {wiki.updated_by && (
+                  <div className="flex items-center gap-2">
+                    <span className="text-gray-400 w-24">Updated By:</span>
+                    <span className="text-gray-300">User #{wiki.updated_by}</span>
+                  </div>
+                )}
+                <div className="flex items-center gap-2">
+                  <span className="text-gray-400 w-24">Created:</span>
+                  <span className="text-gray-300">
+                    {wiki.created_at ? new Date(wiki.created_at).toLocaleString() : 'N/A'}
+                  </span>
+                </div>
+                <div className="flex items-center gap-2">
+                  <span className="text-gray-400 w-24">Updated:</span>
+                  <span className="text-gray-300">
+                    {wiki.updated_at ? new Date(wiki.updated_at).toLocaleString() : 'N/A'}
+                  </span>
+                </div>
+              </div>
+            </div>
+
+            {/* Linked Entities Section */}
+            <div className="pt-6 border-t border-gray-700 mt-6">
+              <h2 className="text-lg font-semibold text-white mb-3">Linked Entities</h2>
+              <div className="text-center py-8 text-gray-400">
+                <div className="text-4xl mb-2">🔗</div>
+                <p>This wiki can be linked to cards and other entities</p>
+              </div>
+            </div>
+          </div>
+        </div>
+      </WidePageLayout>
+    </div>
+  );
+}
+
+export default WikiDetail;

frontend/src/types/epic.ts

@@ -0,0 +1,81 @@
+export interface Epic {
+  id: number;
+  name: string;
+  description: string | null;
+  content: Record<string, unknown> | null;
+  color: string | null;
+  closed: boolean;
+  pos: number | null;
+  depth_limit: number | null;
+  board_id: number;
+  parent_epic_id: number | null;
+  date_last_activity: string | null;
+  created_at: string | null;
+  updated_at: string | null;
+  metrics: {
+    card_count?: number;
+    progress?: number;
+  } | null;
+}
+
+export interface Wiki {
+  id: number;
+  name: string;
+  slug: string | null;
+  content: Record<string, unknown>;
+  summary: string | null;
+  category: string | null;
+  board_id: number;
+  created_by: number | null;
+  updated_by: number | null;
+  created_at: string | null;
+  updated_at: string | null;
+  tags: string[] | null;
+}
+
+export interface CreateEpicRequest {
+  name: string;
+  description?: string;
+  content?: Record<string, unknown>;
+  color?: string;
+  pos?: number;
+  depth_limit?: number;
+  parent_epic_id?: number | null;
+}
+
+export interface UpdateEpicRequest {
+  name?: string;
+  description?: string;
+  content?: Record<string, unknown>;
+  color?: string;
+  closed?: boolean;
+  pos?: number;
+  depth_limit?: number;
+  parent_epic_id?: number | null;
+}
+
+export interface CreateWikiRequest {
+  name: string;
+  slug?: string;
+  content: Record<string, unknown>;
+  summary?: string;
+  category?: string;
+  tags?: string[];
+}
+
+export interface UpdateWikiRequest {
+  name?: string;
+  slug?: string;
+  content?: Record<string, unknown>;
+  summary?: string;
+  category?: string;
+  tags?: string[];
+}
+
+export interface WikiEntityLink {
+  wiki_id: number;
+  entity_type: string;
+  entity_id: number;
+  created_at: string | null;
+  linked_by: number | null;
+}

frontend/src/types/kanban.ts

@@ -183,3 +183,16 @@ export interface User {
   first_name?: string;
   last_name?: string;
 }
+
+// File Attachment types
+export interface FileAttachment {
+  uuid: string;
+  original_name: string;
+  file_type: string;
+  file_size: number;
+  mime_type: string;
+  created_at: string;
+  download_url: string;
+  thumbnail_url: string | null;
+  view_url: string;
+}

frontend/tsconfig.node.json

@@ -4,7 +4,10 @@
     "skipLibCheck": true,
     "module": "ESNext",
     "moduleResolution": "bundler",
-    "allowSyntheticDefaultImports": true
+    "allowSyntheticDefaultImports": true,
+    "paths": {
+      "@/*": ["./src/*"]
+    }
   },
   "include": ["vite.config.ts"]
 }

frontend/vite.config.ts

@@ -1,9 +1,15 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
+import path from 'path'
 
 // https://vitejs.dev/config/
 export default defineConfig({
   plugins: [react()],
+    resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
   server: {
     port: 3000,
     proxy: {