Freegle / Iznik / 4361

64%

master: 70%

Pull #105

circleci

feat: connection-level deadlock retry with exponential backoff

Add DeadlockRetryConnection — a custom MySqlConnection that
automatically retries deadlocked statements at autocommit level with
exponential backoff (100ms, 200ms, 400ms). Inside explicit transactions,
deadlocks propagate immediately.

This makes ALL database operations deadlock-resilient transparently.
Remove retryOnDeadlock() from TransactionPolicy and simplify
EmailTracking.createForEmail() back to a plain self::create().

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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