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Waleed 387fa378a5 fix(knowledge): purge trashed Google Sheets tabs on a normal sync (#5883)
* fix(knowledge): purge trashed Google Sheets tabs on a normal sync

Trashing a spreadsheet made listDocuments return an empty listing,
but the sync engine's zero-document guard skips deletion
reconciliation whenever a listing comes back empty and documents
already exist — it can't tell a genuinely empty source apart from a
provider outage. For a single-spreadsheet connector, trashing its
one source item empties the entire listing, so the guard always
fired and the stale tabs never got cleaned up on a normal sync,
contradicting the documented behavior.

Add shouldSkipEmptyListing, mirroring shouldReconcileDeletions: a
connector can now set syncContext.sourceConfirmedEmpty when it has
positively confirmed the empty result against the source (not
merely inferred it from an empty listing page), letting
reconciliation proceed. The Google Sheets connector sets this flag
when it confirms the spreadsheet is trashed via a direct Drive
metadata lookup. No other connector sets it, so this doesn't change
behavior anywhere else.

* fix(knowledge): let sourceConfirmedEmpty also bypass the mass-deletion safety threshold

The zero-document guard bypass alone wasn't enough: for a trashed
spreadsheet with more than 5 tabs, reconciliation would proceed but
the separate mass-deletion ratio guard (>50% deleted, >5 docs) still
blocked the actual delete on a normal sync, requiring a forced full
resync anyway. Extracted the ratio guard into
exceedsDeletionSafetyThreshold, mirroring shouldSkipEmptyListing, so
a connector's positive source confirmation bypasses both guards
consistently.
2026-07-22 23:14:42 -07:00
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