fix: escape all LIKE specials in step-row cleanup

tests/unit/test_step_rerun_idempotent.py

@@ -67,3 +67,26 @@ def test_clear_step_rows_missing_tables_is_noop(tmp_path) -> None:
     conn.commit()
     conn.close()
     _clear_step_rows(str(db), baseline_run_id="infer_adhoc", epoch=1, step=0)
+
+
+def test_clear_step_rows_like_specials_in_run_id(tmp_path) -> None:
+    """run_id 含 % 与反斜杠时不通配误删他 run 行(LIKE 全特殊字符转义回归锁)。"""
+    db = tmp_path / "harness.db"
+    conn = sqlite3.connect(db)
+    conn.execute("CREATE TABLE predictions (run_id TEXT, question_id TEXT)")
+    conn.execute("CREATE TABLE traces (run_id TEXT, question_id TEXT)")
+    rows = [
+        (r"we%ird\run_e1_s0", "q1"),  # 本 step rollout
+        (r"we%ird\run_e1_s0_gate_x_base", "q2"),  # 本 step gate 行
+        (r"weXird\run_e1_s0_gate_x_base", "q3"),  # % 若未转义会误匹配此行
+        (r"we%irdXrun_e1_s0_gate_x_base", "q4"),  # \ 若未转义会误匹配此行
+    ]
+    conn.executemany("INSERT INTO predictions VALUES (?, ?)", rows)
+    conn.executemany("INSERT INTO traces VALUES (?, ?)", rows)
+    conn.commit()
+    conn.close()
+    _clear_step_rows(str(db), baseline_run_id=r"we%ird\run", epoch=1, step=0)
+    conn = sqlite3.connect(db)
+    left = {r[0] for r in conn.execute("SELECT run_id FROM predictions")}
+    conn.close()
+    assert left == {r"weXird\run_e1_s0_gate_x_base", r"we%irdXrun_e1_s0_gate_x_base"}