Excel to SQLite (Grid.is Integration)

1. Create a Grid.is account and upload your Excel workbook (manually or via the script once).
2. Add your GRID_API_KEY, WORKBOOK_ID, SHEET_NAME, and RANGE to a .env file.
3. Run the script to pull cell data and store it in a local SQLite database.

⚠️ Only call the upload_to_grid() function once per file to avoid duplicates.