diff --git a/services/recommender/tests/test_db_integration.py b/services/recommender/tests/test_db_integration.py
index f72ad63..ff9bda6 100644
--- a/services/recommender/tests/test_db_integration.py
+++ b/services/recommender/tests/test_db_integration.py
@@ -186,7 +186,10 @@ def test_impression_features_roundtrip(world: dict[str, Any]) -> None:
 def test_demographic_prior_advances_age_and_preserves_own_feedback(world: dict[str, Any]) -> None:
     user = uid()
     with psycopg.connect(DSN, autocommit=True) as conn:
-        conn.execute("INSERT INTO users (id, username, password_hash) VALUES (%s, %s, 'x')", (user, f"cohort-{user[:6]}"))
+        conn.execute(
+            "INSERT INTO users (id, username, password_hash) VALUES (%s, %s, 'x')",
+            (user, f"cohort-{user[:6]}"),
+        )
         # Target selected 13–19 twenty years ago; matching listeners are now 30–39.
         conn.execute(
             "INSERT INTO user_profiles_rec (user_id, onboarding) VALUES (%s, "
@@ -204,7 +207,13 @@ def test_demographic_prior_advances_age_and_preserves_own_feedback(world: dict[s
         track = world["tracks"][0]  # two matching listeners liked it
         assert 0 < profile.scores[track] <= 0.25
         assert not profile.played
-        conn.execute("INSERT INTO track_reactions (user_id, track_id, reaction) VALUES (%s, %s, 'dislike')", (user, track))
+        conn.execute(
+            "INSERT INTO track_reactions (user_id, track_id, reaction) VALUES (%s, %s, 'dislike')",
+            (user, track),
+        )
         assert track not in load_profile(conn, user).scores
-        conn.execute("UPDATE user_profiles_rec SET onboarding = %s WHERE user_id = %s", (json.dumps({"gender": "female"}), user))
+        conn.execute(
+            "UPDATE user_profiles_rec SET onboarding = %s WHERE user_id = %s",
+            (json.dumps({"gender": "female"}), user),
+        )
         assert not load_profile(conn, user).scores, "no invented preferences when the cohort has no evidence"