- Replaced direct SQLite database calls with Drizzle ORM methods in `top-monthly-sold-by-category.ts`, `writer.ts`, and `upc-file-analysis.ts`.
- Updated test cases in `top-monthly-sold-by-category.test.ts` to mock the new database interactions.
- Removed unnecessary database initialization and cleanup code.
- Improved code readability and maintainability by using ORM features for inserting and updating records.
