-- 303_eid_study_weakness_no_delete.sql — 301_eid_study_weakness.sql 분리본 (single-statement). asyncpg 러너가 prepared statement 로 처리해 multi-statement 거부 → 1 stmt/파일. 내용 불변.

CREATE OR REPLACE RULE eid_study_weakness_no_delete AS ON DELETE TO eid_study_weakness DO INSTEAD NOTHING;