psql

.serena/memories/postgresql_migration_complete.md

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+# PostgreSQL Migration Completed
+
+## Changes Made
+- **Docker Compose**: Added PostgreSQL 15 service with persistent data volume
+- **Database Configuration**: Migrated from SQLite3 to PostgreSQL using pg library
+- **Package Dependencies**: Updated package.json (removed sqlite3, added pg and @types/pg)
+- **Database Class**: Converted all methods to use PostgreSQL syntax and async/await pattern
+
+## Key Configuration
+- Database URL: `postgresql://quixotic:quixotic123@postgres:5432/quixotic`
+- Container: `quixotic-postgres` with health checks
+- Volume: `postgres-data` for data persistence
+- Environment variables: POSTGRES_DB, POSTGRES_USER, POSTGRES_PASSWORD
+
+## Database Schema Changes
+- INTEGER PRIMARY KEY → SERIAL PRIMARY KEY
+- BIGINT for telegram_id (better for large Telegram IDs)
+- TIMESTAMP instead of DATETIME
+- PostgreSQL-style REFERENCES syntax for foreign keys
+- ON CONFLICT DO UPDATE for upsert operations
+
+## Status
+✅ Migration completed successfully
+✅ Application starts without database errors
+✅ All dependencies installed
+✅ Docker containers running properly