Why is my warehouse data not syncing to downstream tools?

There are a few common reasons warehouse data stops syncing to downstream tools (BI, reverse ETL, CDP, CRM, etc.). The issue is usually in one of these layers:

1) Upstream data didn’t land in the warehouse

• Source ingestion failed
• A connector token expired
• Schema changed and the sync broke
• Incremental loads are missing records due to cursor/watermark issues

2) Transformations produced no usable output

• A dbt/model/job failed
• A filter removed the rows you expected
• A join created nulls or duplicates
• The table/view the downstream tool reads was renamed or dropped

3) Downstream sync is failing

• Credentials/API key expired
• The downstream tool is paused or rate-limited
• Field mapping changed
• The sync is set to manual or on a long interval
• The tool only syncs certain tables/views and yours isn’t included

4) Data freshness or permissions issue

• The tool is reading from a stale replica or cached query result
• Warehouse permissions changed
• Row-level security or masking policies hide the data
• The downstream service account lost access to the schema/table

5) Definition mismatch

• “Not syncing” may actually mean the data is there, but:
  • wrong environment (dev vs prod)
  • wrong table/view
  • wrong timestamp/time zone
  • delayed by schedule
  • records are present but not visible due to dedupe logic

Quick checks

1. Check the latest successful run in the ingestion and downstream sync logs
2. Confirm the warehouse table/view has the expected rows
3. Verify schema changes in the last deploy
4. Check connector auth and permissions
5. Look for rate limits, backoffs, or retries
6. Test with a single known record end-to-end

If you want, I can help you diagnose it step by step.

Tell me:

• What warehouse you use
• Which downstream tool isn’t syncing
• Whether the data reaches the warehouse
• Any error message or recent schema/job changes