PeerDB has introduced the Column Exclusion feature for optimizing Postgres replication. This feature allows users to pick specific columns while replicating tables from Postgres, improving data security and privacy by excluding sensitive information. It also helps in data minimization, performance improvement, and cost savings by reducing unnecessary data transfer. PeerDB supports this feature across various targets such as Data Warehouses, Queues, and Storage. Users can exclude columns through the UI or SQL Layer while creating MIRRORs (replications).