7d702e9cbd
- Add db.py PostgreSQL abstraction layer (connection, upsert, table mgmt) - Replace sqlite3 with psycopg2 in: live_candle_fetcher, resampler, data_fetcher, fetch_history, import_csv, indicators, base_strategy - Sanitize table names (colons -> underscores) for PostgreSQL compat - Replace INSERT OR REPLACE with ON CONFLICT upserts - Replace pandas to_sql() with batch upsert_candles() - Add scripts: resampler_loop, gap_detector, backup_runner, cron_scheduler - Add migrate_sqlite_to_pg.py for one-time data migration - Add Dockerfile, docker-compose.yml, supervisord.conf - Add postgres/postgresql.conf tuned for 4GB RAM (Synology DS1513+) - Add .dockerignore, .env.docker.example, secrets template - Update requirements.txt (psycopg2-binary), .gitignore - Add MIGRATION_PLAN.md with full plan and todo list