Unexpected Row Insertion Above Headers When First Column Is Blank

### Expected behavior
- When appending a new row to a Google Sheet using the API, the new row should be added below the existing data, respecting the presence of table headers.

### Actual behavior
- When the first column is left blank, the new row is inserted above the headers, disrupting the intended data structure.

[

](url)

Start by reproducing the Google Sheets append operation described here with the first column blank, then locate the client request path responsible for appending rows. Done means a new row is placed below the existing headers and data in this case, with regression coverage added if the repository has tests for this path.

Vom Indexierungsmodell aus dem Issue-Text verfasst.