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Replace the polling-based delivery engine with a fully event-driven architecture using Go channels and goroutines: - Webhook handler notifies engine via buffered channel after creating delivery records, with inline event data for payloads < 16KB - Large payloads (>= 16KB) use pointer semantics (Body *string = nil) and are fetched from DB on demand, keeping channel memory bounded - Failed retry-target deliveries schedule Go timers with exponential backoff; timers fire into a separate retry channel when ready - On startup, engine scans DB once to recover interrupted deliveries (pending processed immediately, retrying get timers for remaining backoff) - DB stores delivery status for crash recovery only, not for inter-component communication during normal operation - delivery.Notifier interface decouples handlers from engine; fx wires *Engine as Notifier No more periodic polling. No more wasted cycles when idle.