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803c5a8dca
Concurrent bucket deletion across multiple filer replicas races on the per-bucket DROP TABLE. The first replica drops the table; the rest hit an undefined-table error (postgres 42P01, mysql 1051) which propagates out of DeleteFolderChildren and panics the filer. On restart the same pending DROP re-runs and the filer crash-loops. Make the drop idempotent. Same defect class in all SQL backends, so fix postgres, postgres2, mysql, mysql2, and sqlite together.