kaffa 3d1e353b1a Replace CSV traffic log with SQLite for better performance ...

- traffic_log.csv → traffic_log.db (SQLite with indexed timestamp)
- INSERT instead of CSV append, DELETE instead of file rewrite
- CLI queries use SQL (GROUP BY for traffic, LIMIT for log)
- retrain_from_log() uses read-only connection with time range query
- Config key: traffic_log_file → traffic_log_db

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-07 10:30:10 +09:00

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