{"product_id":"prevent-duplicate-webhooks-with-postgres-in-n8n-automation","title":"Prevent Duplicate Webhooks with Postgres in n8n Automation","description":"\u003cp\u003eEliminate duplicate webhook processing headaches with this robust n8n automation that uses PostgreSQL to intelligently detect and prevent duplicate POST requests from overwhelming your business logic.\u003c\/p\u003e\n\n\u003ch3\u003eWhat this workflow does\u003c\/h3\u003e\n\u003cp\u003eThis powerful deduplication workflow acts as a smart gateway for your webhook endpoints. When a POST webhook arrives at your configured endpoint, the workflow generates a SHA-256 hash of the complete JSON payload and cross-references it against a PostgreSQL deduplication table. Only unique requests within the last 24 hours trigger your business logic, while duplicates are gracefully skipped with clear status responses.\u003c\/p\u003e\n\n\u003cp\u003eThe workflow adds correlation IDs and timestamps to track each request, then queries your Postgres \u003ccode\u003ewebhook_dedup\u003c\/code\u003e table to identify previously processed payloads. New webhooks receive a \"processed\" status with correlation ID, while duplicates return \"duplicate_skipped\" status with the dedup hash for complete transparency.\u003c\/p\u003e\n\n\u003ch3\u003eUse cases\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePayment processing:\u003c\/strong\u003e Prevent duplicate payment webhooks from Stripe, PayPal, or other payment providers from creating multiple charges\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrder management:\u003c\/strong\u003e Stop duplicate order notifications from e-commerce platforms from triggering multiple fulfillment processes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAPI integrations:\u003c\/strong\u003e Protect your n8n workflows from unreliable third-party systems that might resend the same webhook multiple times\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEvent-driven automation:\u003c\/strong\u003e Ensure CRM updates, inventory adjustments, or notification triggers only fire once per unique event\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical details\u003c\/h3\u003e\n\u003cp\u003eThis n8n automation workflow leverages four core node types:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWebhook node:\u003c\/strong\u003e Receives POST requests at your custom endpoint\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCode node:\u003c\/strong\u003e Generates SHA-256 payload hashes and correlation IDs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePostgreSQL nodes:\u003c\/strong\u003e Query and insert deduplication records with 24-hour lookups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIF node:\u003c\/strong\u003e Routes workflow logic based on duplicate detection results\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eSetup requires a PostgreSQL database with a \u003ccode\u003ewebhook_dedup\u003c\/code\u003e table containing payload_hash, correlation_id, received_at, and created_at columns. Compatible with n8n version 1.0 and later.\u003c\/p\u003e","brand":"N8N Commerce","offers":[{"title":"Default Title","offer_id":45539166290099,"sku":"N8N-15963","price":9.99,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0749\/6279\/6723\/files\/T__RFgBZG4y4odFqha1Oe_f038a2c5dac64f27b3f4579c34969c0e.jpg?v=1779872740","url":"https:\/\/buyflowscripts.com\/products\/prevent-duplicate-webhooks-with-postgres-in-n8n-automation","provider":"N8N Commerce","version":"1.0","type":"link"}