=== 넓힌 grep 이 둘 다 잡나 ===
KC-SERVICES0015: Unexpected error when authenticating client: org.hibernate.exception.JDBCConnectionException: Unable to acquire JDBC Connection [Connection to postgres:5432 refused. Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.]

=== a7a 재현 B — 로그인 한 번으로 캐시를 덥힌 뒤 DB 를 내린다 ===
deployment.apps/postgres scaled
deployment "postgres" successfully rolled out
statefulset.apps/keycloak restarted
partitioned roll out complete: 2 new pods have been updated...
pod/a7a-probe condition met
--- 로그인 한 번 (DB 살아 있을 때) ---
rt=612자
--- DB 를 내린다 ---
deployment.apps/postgres scaled
pod/postgres-7b474b88c8-dg4vb condition met
--- refresh (기대: 500) ---
{"error":"unknown_error","error_description":"For more on this error consult the server log."}
500