Persistent Lead Deduplication with n8n Data Tables

Internal technical proof — synthetic data

Internal technical proof of persistent lead deduplication and idempotency using native n8n Data Tables. Separate webhook executions were tested against repeated event IDs and repeated normalized identities so duplicate events or identities did not create additional stored rows.

Verification The n8n process was then restarted and the persisted Data Table state was audited again, confirming that the tested deduplication state survived the restart.

Role: Automation Designer & Developer. Scope: isolated synthetic-data test. No client CRM or production environment was connected. High-concurrency safety is not established by this proof.