Google Sheets Sync Dropping or Duplicating Records
Your Base44 app syncs data to Google Sheets for reporting or external access, but the sync is unreliable. Records are missing from the spreadsheet, some records appear multiple times, data in the sheet doesn't match the app, or the sync stops working entirely after running fine for weeks.
Google Sheets sync is commonly used in Base44 apps for sharing data with team members who prefer spreadsheets, creating reports, feeding data to other tools that read from Sheets, and maintaining backups. When the sync breaks, downstream processes that depend on the spreadsheet data also break.
The issue is especially frustrating because it's non-deterministic. Most records sync correctly, but a random subset is missing or duplicated, making it hard to trust any of the data.
Error Messages You Might See
Common Causes
- Rate limiting by Google Sheets API — Too many write requests hit the Sheets API rate limit, causing some operations to silently fail
- No unique identifier for upsert — Without a unique key to match records, the sync creates new rows instead of updating existing ones
- Concurrent writes corrupting rows — Multiple sync operations writing to the sheet simultaneously cause row conflicts
- Column mapping drift — Columns were added or renamed in Base44 but not updated in the sync configuration
- OAuth token expiration — The Google OAuth token used for Sheets access expired and wasn't refreshed
How to Fix It
- Add a unique identifier column — Use a unique record ID as the first column in the sheet. Match on this ID to update existing rows instead of always appending
- Implement batch writing — Instead of writing one row at a time, batch changes and write them in a single API call to avoid rate limits
- Add sync logging — Log every sync operation (create, update, skip) with the record ID so you can audit what happened
- Handle OAuth token refresh — Implement automatic token refresh and alert when Google authorization needs to be re-granted
- Verify column mapping regularly — After any schema change in Base44, verify the column mapping in the sync configuration still matches
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Get HelpFrequently Asked Questions
Why are some records missing from my Google Sheet?
The most common cause is Google Sheets API rate limiting. When too many writes happen quickly, some fail silently. Implement batch writing and add logging to track which records were successfully synced.
How do I prevent duplicate rows in the synced Google Sheet?
Use a unique record ID column as the key for matching. Before writing a new row, check if a row with that ID already exists and update it instead. This 'upsert' pattern prevents duplicates.