refs #731: fix autonomous vector example storage

sql/adb/75_sgmp_qa_vector_retrieval.sql

@@ -94,6 +94,7 @@ CREATE OR REPLACE FUNCTION sg_qa_vector_store(
 ) RETURN NUMBER
 AUTHID DEFINER
 IS
+  PRAGMA AUTONOMOUS_TRANSACTION;
   v_input      CLOB;
   v_embedding  VECTOR;
   v_example_id NUMBER;
@@ -116,7 +117,12 @@ BEGIN
     p_question, p_answer_sql, p_answer, v_input, v_embedding, 'cohere.embed-v4.0'
   ) RETURNING example_id INTO v_example_id;
 
+  COMMIT;
   RETURN v_example_id;
+EXCEPTION
+  WHEN OTHERS THEN
+    ROLLBACK;
+    RAISE;
 END;
 /