Wire SELECT_COLS, mapRow deserialization, and saveDeployedConfigSnapshot update method. Adds PostgresDeploymentRepositoryIT with roundtrip, null-default, and clear-to-null tests. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Wire SELECT_COLS, mapRow deserialization, and saveDeployedConfigSnapshot update method. Adds PostgresDeploymentRepositoryIT with roundtrip, null-default, and clear-to-null tests. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>