Updated README with detailed instructions for:
- SQLite3 (default/development) with pros/cons
- PostgreSQL (recommended for production) with full setup
- MariaDB/MySQL configuration and setup
- Database migration between backends
Each section includes:
- Installation instructions for Ubuntu/Debian and macOS
- Database and user creation commands
- Python driver installation
- Configuration examples (both .env and direct settings)
- Migration steps
Also added data export/import instructions for switching databases.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>