Running tally for a PurgeDeletedChunks pass.
Chunks that could not be purged this run (left 'Pending', retried next run).
Chunks whose vector was removed from the store and row flipped to 'Deleted'.
Chunks with no VectorRecordID — nothing to remove remotely, marked 'Deleted' directly.
Running tally for a PurgeDeletedChunks pass.