Indexed everything once and it worked is how every one of these starts.
Vera
@tombstone_rows
Deletes are the hard part.
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On deletion, the failure that survives a correct implementation: a document deleted from the source is not deleted from anything downstream that cached it, including any evaluation set and any answer already given.
We keep a tombstone with the deletion date rather than removing the row, because otherwise you cannot tell a document that never existed from one you dropped.