feat: Implement task and reward tracking feature

- Added tracking events for tasks, penalties, and rewards with timestamps.
- Created new TinyDB table for tracking records to maintain audit history.
- Developed backend API for querying tracking events with filters and pagination.
- Implemented logging for tracking events with per-user rotating log files.
- Added unit tests for tracking event creation, querying, and anonymization.
- Deferred frontend changes for future implementation.
- Established acceptance criteria and documentation for the tracking feature.

feat: Introduce account deletion scheduler

- Implemented a scheduler to delete accounts marked for deletion after a configurable threshold.
- Added new fields to the User model to manage deletion status and attempts.
- Created admin API endpoints for managing deletion thresholds and viewing the deletion queue.
- Integrated error handling and logging for the deletion process.
- Developed unit tests for the deletion scheduler and related API endpoints.
- Documented the deletion process and acceptance criteria.

backend/api/tracking_api.py

@@ -0,0 +1,122 @@
+from flask import Blueprint, request, jsonify
+from api.utils import get_validated_user_id
+from db.tracking import get_tracking_events_by_child, get_tracking_events_by_user
+from models.tracking_event import TrackingEvent
+from functools import wraps
+import jwt
+from tinydb import Query
+from db.db import users_db
+from models.user import User
+
+
+tracking_api = Blueprint('tracking_api', __name__)
+
+
+def admin_required(f):
+    """
+    Decorator to require admin role for endpoints.
+    """
+    @wraps(f)
+    def decorated_function(*args, **kwargs):
+        # Get JWT token from cookie
+        token = request.cookies.get('token')
+        if not token:
+            return jsonify({'error': 'Authentication required', 'code': 'AUTH_REQUIRED'}), 401
+        
+        try:
+            # Verify JWT token
+            payload = jwt.decode(token, 'supersecretkey', algorithms=['HS256'])
+            user_id = payload.get('user_id')
+            
+            if not user_id:
+                return jsonify({'error': 'Invalid token', 'code': 'INVALID_TOKEN'}), 401
+            
+            # Get user from database
+            Query_ = Query()
+            user_dict = users_db.get(Query_.id == user_id)
+            
+            if not user_dict:
+                return jsonify({'error': 'User not found', 'code': 'USER_NOT_FOUND'}), 404
+            
+            user = User.from_dict(user_dict)
+            
+            # Check if user has admin role
+            if user.role != 'admin':
+                return jsonify({'error': 'Admin access required', 'code': 'ADMIN_REQUIRED'}), 403
+            
+            # Store user_id in request context
+            request.admin_user_id = user_id
+            return f(*args, **kwargs)
+        
+        except jwt.ExpiredSignatureError:
+            return jsonify({'error': 'Token expired', 'code': 'TOKEN_EXPIRED'}), 401
+        except jwt.InvalidTokenError:
+            return jsonify({'error': 'Invalid token', 'code': 'INVALID_TOKEN'}), 401
+    
+    return decorated_function
+
+
+@tracking_api.route('/admin/tracking', methods=['GET'])
+@admin_required
+def get_tracking():
+    """
+    Admin endpoint to query tracking events with filters and pagination.
+    
+    Query params:
+    - child_id: Filter by child ID (optional)
+    - user_id: Filter by user ID (optional, admin only)
+    - entity_type: Filter by entity type (task/reward/penalty) (optional)
+    - action: Filter by action type (activated/requested/redeemed/cancelled) (optional)
+    - limit: Max results (default 50, max 500)
+    - offset: Pagination offset (default 0)
+    """
+    child_id = request.args.get('child_id')
+    filter_user_id = request.args.get('user_id')
+    entity_type = request.args.get('entity_type')
+    action = request.args.get('action')
+    limit = int(request.args.get('limit', 50))
+    offset = int(request.args.get('offset', 0))
+    
+    # Validate limit
+    limit = min(max(limit, 1), 500)
+    offset = max(offset, 0)
+    
+    # Validate filters
+    if entity_type and entity_type not in ['task', 'reward', 'penalty']:
+        return jsonify({'error': 'Invalid entity_type', 'code': 'INVALID_ENTITY_TYPE'}), 400
+    
+    if action and action not in ['activated', 'requested', 'redeemed', 'cancelled']:
+        return jsonify({'error': 'Invalid action', 'code': 'INVALID_ACTION'}), 400
+    
+    # Query tracking events
+    if child_id:
+        events, total = get_tracking_events_by_child(
+            child_id=child_id,
+            limit=limit,
+            offset=offset,
+            entity_type=entity_type,
+            action=action
+        )
+    elif filter_user_id:
+        events, total = get_tracking_events_by_user(
+            user_id=filter_user_id,
+            limit=limit,
+            offset=offset,
+            entity_type=entity_type
+        )
+    else:
+        return jsonify({
+            'error': 'Either child_id or user_id is required',
+            'code': 'MISSING_FILTER'
+        }), 400
+    
+    # Convert to dict
+    events_data = [event.to_dict() for event in events]
+    
+    return jsonify({
+        'tracking_events': events_data,
+        'total': total,
+        'limit': limit,
+        'offset': offset,
+        'count': len(events_data)
+    }), 200