Refactor backend: fix geo cache cleanup, scheduler heartbeat, correlation middleware; update docs

Docs/Tasks.md

@@ -1,44 +1,3 @@
-### Issue #22: MEDIUM - Socket Cleanup Errors Silently Suppressed
-
-**Where found**: 
-- `backend/app/utils/fail2ban_client.py` (line 150)
-- Uses `contextlib.suppress(Exception)` hiding close errors
-- Resource leaks possible
-
-**Why this is needed**: 
-Suppressing all errors hides real problems:
-- Socket never actually closes
-- Connection pool exhaustion
-- File descriptors leak
-
-**Goal**: 
-Log errors properly while still cleaning up resources.
-
-**What to do**:
-1. Replace suppress with logging:
-   ```python
-   finally:
-       try:
-           await socket.close()
-       except Exception as e:
-           logger.warning(f"Error closing fail2ban socket: {e}", exc_info=True)
-   ```
-2. Audit other resource cleanup (database connections, HTTP sessions)
-3. Write tests that verify cleanup happens even on errors
-
-**Possible traps and issues**:
-- Close might raise unexpected errors
-- Logging exceptions in finally blocks can cause issues
-- Resource exhaustion hard to debug if not logging
-
-**Docs changes needed**:
-- Add resource cleanup guidelines to dev guide
-
-**Doc references**:
-- DETAILED_FINDINGS.md - Issue #14 "Socket Cleanup Silent Fail"
-
----
-
 ### Issue #23: MEDIUM - Missing Default Configuration Documentation
 
 **Where found**: