refs #730: add ADB PostgreSQL federation recording scripts

sql/adb/74_hmm_rds_pg_01_credential.sql

@@ -0,0 +1,20 @@
+-- ============================================================
+-- Step 1: create the PostgreSQL credential.
+-- Run only this statement after replacing <RDS_PASSWORD> in the
+-- Worksheet. Never save the actual password in this file.
+-- Redmine: #730
+-- ============================================================
+
+BEGIN
+  DBMS_CLOUD.CREATE_CREDENTIAL(
+    credential_name => 'HMM_RDS_PG_CRED',
+    username        => 'postgres',
+    password        => '<RDS_PASSWORD>'
+  );
+END;
+/
+
+-- Passwords are never returned by ALL_CREDENTIALS.
+SELECT credential_name, username
+FROM all_credentials
+WHERE credential_name = 'HMM_RDS_PG_CRED';