NeahNew/NOTIFICATION_FIXES_IMPLEMENTED.md

Notification System Fixes - Implementation Summary

Date: 2026-01-06
Status: ✅ All fixes implemented

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✅ Fix #1: Redis Caching for Leantime User ID

Problem:

• getLeantimeUserId() fetched ALL users from Leantime API every time
• No caching, causing slow performance and inconsistent results
• Race conditions between different calls

Solution:

• Added Redis caching with 1-hour TTL
• Cache key: leantime:userid:${email.toLowerCase()}
• Checks cache first before making API call
• Caches result after successful fetch

Implementation:

• File: lib/services/notifications/leantime-adapter.ts
• Method: getLeantimeUserId()
• Cache TTL: 3600 seconds (1 hour)
• Static helper: invalidateUserIdCache() for manual cache clearing

Benefits:

• ✅ Faster performance (no API call if cached)
• ✅ More reliable (consistent results)
• ✅ Reduced API load on Leantime
• ✅ Better error recovery (can use cached value if API fails)

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✅ Fix #2: Retry Logic with Exponential Backoff

Problem:

• getLeantimeUserId() failed immediately on API errors
• No retry mechanism for transient failures
• Network errors caused permanent failures

Solution:

• Added retry logic with up to 3 retries
• Exponential backoff: 1s, 2s, 4s (max 5s)
• Retries on:
  • Server errors (5xx)
  • Rate limiting (429)
  • Network errors
  • Certain JSON-RPC errors

Implementation:

• File: lib/services/notifications/leantime-adapter.ts
• Method: getLeantimeUserId() with fetchWithRetry()
• Max Retries: 3
• Backoff: Exponential (1s → 2s → 4s)

Benefits:

• ✅ Handles transient failures gracefully
• ✅ Better resilience to network issues
• ✅ Improved success rate for user ID lookup

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✅ Fix #3: Always Invalidate Cache After Marking

Problem:

• Cache only invalidated if marking operation succeeded
• If getLeantimeUserId() failed, cache stayed stale
• Count remained at old value (65) even after marking attempts

Solution:

• Always invalidate cache after marking attempt
• Even if operation failed or returned false
• Ensures fresh data on next fetch

Implementation:

• File: lib/services/notifications/notification-service.ts
• Methods:
  • markAsRead() - Always invalidates cache
  • markAllAsRead() - Always invalidates cache
• Logic: Cache invalidation happens regardless of success/failure

Benefits:

• ✅ Count always refreshes after marking attempts
• ✅ User sees accurate data even if operation partially failed
• ✅ Better UX (no stale count stuck at 65)

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✅ Fix #4: Improved Count Accuracy

Problem:

• Count only based on first 100 notifications
• If user had >100 notifications, count was inaccurate
• Used cached notifications which might be stale

Solution:

• Fetch up to 1000 notifications directly from API for counting
• Bypasses cache to get fresh data
• More accurate count for users with many notifications

Implementation:

• File: lib/services/notifications/leantime-adapter.ts
• Method: getNotificationCount()
• Change: Fetches directly from API (up to 1000) instead of using cached getNotifications()
• Warning: Logs if count reaches 1000 (might have more)

Benefits:

• ✅ More accurate count (up to 1000 notifications)
• ✅ Fresh data (bypasses cache)
• ✅ Better handling of users with many notifications

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✅ Fix #5: Better Error Handling and Logging

Problem:

• Errors were logged but not handled gracefully
• No way to manually clear user ID cache
• Limited error context in logs

Solution:

• Added static method to invalidate user ID cache
• Improved error messages with more context
• Better logging throughout the flow
• Graceful degradation on errors

Implementation:

• File: lib/services/notifications/leantime-adapter.ts
• Static Method: invalidateUserIdCache(email)
• Improved Logging: More detailed error messages
• Error Recovery: Continues operation even if caching fails

Benefits:

• ✅ Better debugging with detailed logs
• ✅ Manual cache clearing for troubleshooting
• ✅ More resilient to partial failures

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📊 Expected Behavior After Fixes

Before Fixes:

1. Mark all as read → getLeantimeUserId() fails → Returns false
2. Cache NOT invalidated → Count stays 65 ❌
3. User sees stale count

After Fixes:

1. Mark all as read → getLeantimeUserId() checks cache first ✅
2. If cached: Uses cached ID immediately ✅
3. If not cached: Fetches with retry logic ✅
4. Marks notifications as read ✅
5. Always invalidates cache ✅
6. Count refresh gets fresh data → Shows 0 ✅

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🎯 Key Improvements

Reliability:

• ✅ User ID lookup is now cached and retried
• ✅ Cache always invalidated after marking
• ✅ Better error recovery

Performance:

• ✅ Faster user ID lookup (cached)
• ✅ Reduced API calls to Leantime
• ✅ More efficient cache usage

Accuracy:

• ✅ Count based on up to 1000 notifications
• ✅ Fresh data from API (bypasses stale cache)
• ✅ Better handling of edge cases

User Experience:

• ✅ Count updates correctly after marking
• ✅ No more stuck count at 65
• ✅ Faster response times

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🚀 Testing Checklist

After rebuild (rm -rf .next && npm run build && npm start):

1. ✅ Test Mark All As Read:

   • Should work even if user ID lookup was previously failing
   • Count should update to 0 after marking
   • Cache should be invalidated

2. ✅ Test Mark Single As Read:

   • Should work reliably
   • Count should decrement correctly
   • Cache should be invalidated

3. ✅ Test Count Accuracy:

   • Should show accurate count (up to 1000)
   • Should refresh after marking
   • Should use fresh data from API

4. ✅ Test User ID Caching:

   • First call should fetch from API
   • Subsequent calls should use cache
   • Should be faster on subsequent calls

5. ✅ Test Retry Logic:

   • Should retry on transient failures
   • Should eventually succeed or fail gracefully
   • Should log retry attempts

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📝 Files Modified

1. lib/services/notifications/leantime-adapter.ts:

   • Added Redis caching for user ID
   • Added retry logic with exponential backoff
   • Improved getNotificationCount() to fetch directly from API
   • Added invalidateUserIdCache() static method
   • Better error handling and logging

2. lib/services/notifications/notification-service.ts:

   • Always invalidate cache in markAsRead()
   • Always invalidate cache in markAllAsRead()
   • Better error handling and logging

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🔧 Configuration

• User ID Cache TTL: 3600 seconds (1 hour)
• Max Retries: 3 attempts
• Retry Backoff: Exponential (1s, 2s, 4s, max 5s)
• Count Fetch Limit: 1000 notifications

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Status: ✅ All fixes implemented and ready for testing