When git merge replaces the .beads/beads.db file, the daemon's
SQLite connection becomes stale (still reading deleted inode).
This adds FreshnessChecker that detects file replacement via
inode/mtime comparison and triggers automatic reconnection.
Implementation:
- freshness.go: monitors db file for replacement
- store.go: adds EnableFreshnessChecking() and reconnect()
- queries.go: calls checkFreshness() on GetIssue/SearchIssues
- daemon.go: enables freshness checking at startup
- freshness_test.go: comprehensive tests including merge scenario
Code quality (per review):
- Extract configureConnectionPool() helper to reduce duplication
- Handle Close() error in reconnect() (log but continue)
- Use t.Cleanup() pattern in tests per project conventions
- Rename setupFreshnessTest() per naming conventions
Overhead: ~2.6μs per read op (~0.8% of total query time)
Signed-off-by: Alessandro De Blasis <alex@deblasis.net>
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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