[konstantinoscs]

Summary

• Consolidate insert, upsert, and delete conflict handling in one retry helper.
• Replace fixed sleeps with exponential full-jitter backoff capped at 30 seconds.
• Preserve max_retries as retries after the initial attempt and refresh metadata before each replay.
• Update row statistics only after a successful mutation.
• Reject non-finite retry delays.

Safety boundary

Only CommitFailedException is replayed. Unknown commit state, HTTP/server, transport, auth, permission, lock, validation, and not-found failures propagate immediately so ambiguous writes are not duplicated. This layer does not re-vend credentials or re-resolve a catalog by mutable name.

Verification

• Deterministic coverage for all three mutations, event ordering, jitter ceilings/cap, exhaustion, refresh failure, and the non-retryable exception taxonomy.
• Full Stack A suite from the top: 225 passed, 10 skipped.

Stack

3 of 5 in Stack A. Base: #340. Next: #342.

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