ERROR: replication slot "debezium" already exists

Root cause

The previous connector instance stopped unexpectedly without dropping the PostgreSQL logical replication slot. PostgreSQL allows only one consumer per slot.

How to fix

1. Drop the stale slot:
   SELECT pg_drop_replication_slot('debezium');
2. Restart the connector. It will recreate the slot automatically.
3. To avoid this in dev/test, set slot.drop.on.stop=true in the connector config.