chore: 유니크 인덱스 제거 작업 (#122)

Author: Gooraeng

back/src/main/resources/db/migration/V6__remove_uq_decision_line_age.sql

@@ -0,0 +1,4 @@
+-- ==============================================
+-- 유니크 인덱스 제거
+-- ==============================================
+ALTER TABLE decision_nodes DROP CONSTRAINT IF EXISTS uq_decision_line_age;