Implemented User Activity Tracking

[KAMALDEEN333]

User Activity Tracking Middleware for Analytics

Description:
Create middleware to track user activity and behavior patterns for analytics, engagement metrics, and personalization.

Requirements:
Track user actions:
Page/endpoint accessed
Action performed (puzzle solved, profile updated)
Time spent on activity
Success/failure of action
Device and platform information
Store activity data in analytics database (separate from main DB)
Support real-time activity streaming to analytics service
Track anonymous users via session tokens
Link activities to user accounts when authenticated
Calculate engagement metrics:
Daily active users (DAU)
Weekly active users (WAU)
Average session duration
Feature usage statistics
Support activity filtering and querying
Privacy-compliant tracking (GDPR, CCPA)
Opt-out mechanism for privacy-conscious users
No impact on request performance (async processing)
Acceptance Criteria:

All significant user actions tracked automatically

Activity data stored asynchronously (no request delay)

Analytics queryable via separate API endpoints

User privacy preferences respected (opt-out honored)

Anonymous and authenticated tracking both work

Activity data retained per privacy policy (e.g., 90 days)

Real-time dashboard shows current active users

Historical analytics available for trend analysis

No PII (personally identifiable information) logged unnecessarily

Performance impact negligible (<2ms added latency)
Events to Track:
User authentication (login, logout, signup)
Puzzle interactions (started, submitted, completed)
Daily quest progress
Category browsing
Profile updates
Social interactions (friend requests, challenges)
Achievement unlocks
Point redemptions
Activity Data Structure:
{
userId or sessionId,
eventType, eventCategory,
timestamp, duration,
metadata (action-specific data),
device, platform, browser,
geolocation (city/country level only)
}
Privacy Compliance:
Respect Do-Not-Track headers
Honor user opt-out preferences
Anonymize IP addresses (last octet removed)
No cross-site tracking
Data retention limits enforced

closes #321

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