How Supabase Webhooks and Prisma Pulse Handle Bulk Updates — and Where They Fall Short

Change Data Capture (CDC) tools like Supabase Database Webhooks and Prisma Pulse allow developers to convert row-level Postgres database changes into real-time events. However, both tools share a structural weakness: bulk database operations can trigger thousands of simultaneous webhook calls, overwhelming downstream APIs with rate-limit errors — a problem known as the 'thundering herd.' Supabase's pg_net extension is configured to handle up to 200 requests per second, a limit that becomes a bottleneck during mass updates. Prisma Pulse has faced additional uncertainty after being temporarily paused in early 2025 for a redesign, with its status still listed as under revision as of mid-2026. Developers are advised to add a resilience layer — such as a message queue with retry logic and dead-letter handling — between their CDC tool and downstream services to manage high-volume event bursts reliably.