• DLQ consumer with CloudWatch alarms for failed workflow and batch messages
• Fixed dual-resume race condition in the workflow processor
• Definition snapshots — in-flight executions are immune to live dashboard edits
• Repaired broken EventBridge schedule chains with reconciliation watchdog
• Hardened webhook SSRF validation — blocks loopback, link-local, and private networks
• 8 critical and high severity workflow bugs resolved in one pass
• Atomic idempotency keys on step execution inserts to prevent duplicate sends

Workflow Engine