diff --git a/replit.md b/replit.md
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@@ -5,11 +5,16 @@ ThrillWiki is a community-driven web application for discovering, reviewing, and
 
 ## Recent Changes (October 8, 2025)
 
+### Bug Fixes & Code Quality
+- **Fixed Novu API Integration:** Updated `update-novu-preferences` Edge Function to correctly use Novu's updatePreference API, which requires separate calls for each channel type (email, sms, in_app, push). Implemented proper error handling that tracks per-channel results and returns 502 status with detailed failure information when any channel fails to update.
+- **Enhanced Input Validation:** Added validation for userId and channelPreferences in `update-novu-preferences` to prevent undefined access errors and return clear 400 error responses for invalid requests.
+- **Fixed TypeScript Errors in Edge Functions:** Corrected null checking for user object in `seed-test-data` function and improved error type handling for JSON parsing operations.
+- **Verified Memory Management:** Confirmed that all React hooks (useAuth, useModerationQueue, useEntityVersions) properly clean up intervals and timers in useEffect return statements to prevent memory leaks.
+
 ### Security Enhancements
 - **Enabled JWT Verification for Image Upload:** Changed `upload-image` Edge Function to `verify_jwt = true` in `supabase/config.toml`. This ensures Supabase validates JWT tokens before the function executes, preventing unauthorized access to image upload/delete operations.
 - **Replaced Manual JWT Decoding with Supabase Verification:** Updated `cancel-email-change` Edge Function to use Supabase's built-in `auth.getUser(token)` method with service role client instead of manual base64 decoding. This approach properly verifies JWT tokens using only runtime-available environment variables (SUPABASE_URL and SUPABASE_SERVICE_ROLE_KEY) while maintaining admin privileges for database operations.
 - **Made Geolocation API Configurable:** Updated `detect-location` Edge Function to use environment variables for geolocation service configuration. The API URL (`GEOLOCATION_API_URL`) and fields (`GEOLOCATION_API_FIELDS`) are now configurable, with sensible defaults (ip-api.com) for easier service switching and testing.
-- **Enhanced Error Handling:** Added comprehensive error handling to all Supabase Edge Functions with granular try-catch blocks for network requests, JSON parsing, and API responses. Improves reliability and provides detailed error messages for debugging.
 
 ## Recent Changes (October 7, 2025)