PostgreSQL Logical Replication Failure – Duplicate Key Conflict | Fix & Resolution

In this video, I demonstrate a real-world PostgreSQL issue where Logical Replication fails due to a Duplicate Key Conflict on the subscriber.

You will see how replication works normally in streaming mode, how a conflicting row on the subscriber causes the logical replication apply worker to fail with a duplicate key value violates unique constraint error, and finally how to fix it safely so replication resumes automatically.

This is a very common production scenario for DBAs and Data Engineers when subscriber-side data drift or unexpected inserts cause replication to pause.

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