- Added functionality to export the full database schema (CREATE statements) and data (INSERT statements) as a single `.sql` file.
- Created a new route `/export/database.sql` in `routes/export.py`.
- Added helper functions to `routes/export.py` (adapted from `sql_explorer`) to generate schema CREATE statements and data INSERT statements.
- Added a download link for the SQL export to the Settings page (`templates/settings.html`).
- Updated the changelog entry for data export to include the SQL option.
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