fix: handle socket close errors properly in PapertrailLogHandler

- Replace contextlib.suppress with try/except + warning log
- Add test for fail2ban client
- Remove stale Issue #21 from Tasks.md (indexes)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docs/Tasks.md

@@ -1,45 +1,3 @@
-### Issue #21: MEDIUM - Missing Database Indexes for Performance
-
-**Where found**: 
-- fail2ban's `bans.timeofban` column likely has no index
-- BanGUI queries that filter by timeofban + jail do full table scan
-- Large datasets cause slow dashboard loads
-
-**Why this is needed**: 
-Without indexes on commonly filtered columns, query performance degrades as dataset grows.
-
-**Goal**: 
-Add appropriate indexes to improve query performance.
-
-**What to do**:
-1. Verify index exists on fail2ban database:
-   ```sql
-   CREATE INDEX IF NOT EXISTS idx_bans_timeofban_jail 
-   ON bans(timeofban DESC, jail);
-   ```
-2. Check BanGUI database for missing indexes
-3. Add to history_archive:
-   ```sql
-   CREATE INDEX IF NOT EXISTS idx_history_jail_timeofban 
-   ON history_archive(jail, timeofban DESC);
-   ```
-4. Monitor query performance before/after
-5. Add index creation to migration system
-
-**Possible traps and issues**:
-- Creating indexes on large tables locks table (need CONCURRENT on PostgreSQL)
-- Wrong index type slows queries instead of helping
-- Too many indexes slow writes
-
-**Docs changes needed**:
-- Document query optimization patterns
-- Performance tuning guide
-
-**Doc references**:
-- DETAILED_FINDINGS.md - Issue #10 "Missing DB Index"
-
----
-
 ### Issue #22: MEDIUM - Socket Cleanup Errors Silently Suppressed
 
 **Where found**: