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/db/db.py

@@ -73,6 +73,7 @@ reward_path = os.path.join(base_dir, 'rewards.json')
 image_path = os.path.join(base_dir, 'images.json')
 pending_reward_path = os.path.join(base_dir, 'pending_rewards.json')
 users_path = os.path.join(base_dir, 'users.json')
+tracking_events_path = os.path.join(base_dir, 'tracking_events.json')
 
 # Use separate TinyDB instances/files for each collection
 _child_db = TinyDB(child_path, indent=2)
@@ -81,6 +82,7 @@ _reward_db = TinyDB(reward_path, indent=2)
 _image_db = TinyDB(image_path, indent=2)
 _pending_rewards_db = TinyDB(pending_reward_path, indent=2)
 _users_db = TinyDB(users_path, indent=2)
+_tracking_events_db = TinyDB(tracking_events_path, indent=2)
 
 # Expose table objects wrapped with locking
 child_db = LockedTable(_child_db)
@@ -89,6 +91,7 @@ reward_db = LockedTable(_reward_db)
 image_db = LockedTable(_image_db)
 pending_reward_db = LockedTable(_pending_rewards_db)
 users_db = LockedTable(_users_db)
+tracking_events_db = LockedTable(_tracking_events_db)
 
 if os.environ.get('DB_ENV', 'prod') == 'test':
     child_db.truncate()
@@ -97,4 +100,5 @@ if os.environ.get('DB_ENV', 'prod') == 'test':
     image_db.truncate()
     pending_reward_db.truncate()
     users_db.truncate()
+    tracking_events_db.truncate()