A filter key with a typo, or in the wrong case such as Handle instead of handle, used to be dropped without telling you. The export then ran without that filter and the count preview reported the full store as an exact count. Exports created through the app, the API, the CLI, or an MCP client now check every filter key up front.
Fixes#
- Unknown filter keys - an export with a filter column the data type does not have is rejected with error JOB008, and the message lists the valid filter columns (see error codes).
- Count preview - the count next to the export setup now shows the same error instead of the store-wide count when a filter key is unknown.