feat: DLQ auto-retry with exponential backoff#2
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- Migration: add permanently_failed, next_retry_at to transaction_dlq - TransactionDlq model: new fields - next_retry_at(): pure backoff fn (base_delay * 2^retry_count) - TransactionProcessor::process_dlq_retries(): polls due entries, requeues as pending or marks permanently_failed after max retries - Emits transaction.dlq_exhausted webhook event on exhaustion - Logs each retry attempt with error_reason - Config: DLQ_MAX_RETRIES (default 5), DLQ_BASE_DELAY_SECS (default 60) - main.rs: spawn DLQ worker polling every 60s - Tests: unit backoff calc, integration retry progression + permanent failure
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Implements automated retry for DLQ entries with exponential backoff.
Changes:
requeues as pending or marks permanently_failed after DLQ_MAX_RETRIES (default 5)