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Migration versioning: - db_migrations.py: MigrationRunner with five numbered migrations; schema_version table tracks applied state; migrations are append-only; runner called on startup from db_manager.py AsyncDBManager: - AsyncDBManager in db_manager.py provides non-blocking DB access in async coroutines via aiosqlite; exposed as bot.async_db_manager - aiosqlite>=0.19.0 added to dependencies APScheduler: - scheduler.py migrated from schedule lib to APScheduler BackgroundScheduler + CronTrigger; schedule dependency removed Message write queue: - Background drain thread eliminates per-packet sqlite3.connect(); executemany batch insert every 0.5s; shutdown path flushes remaining rows