[music] Look up tracks by musicbrainz_id before falling back to title

tests/scrobbles_tests/test_webhook_enrichment.py

@@ -47,6 +47,62 @@ def test_find_or_create_reuses_existing_track_by_mbid(mock_resolve):
     mock_resolve.assert_not_called()
 
 
+@pytest.mark.django_db
+@patch("music.models.resolve_track")
+def test_find_or_create_looks_up_by_mbid_before_title(mock_resolve):
+    artist = Artist.objects.create(name="AC/DC")
+    wrong = Track.objects.create(title="TNT", musicbrainz_id="rec-999")
+    wrong.artists.add(artist)
+    existing = Track.objects.create(title="TNT", musicbrainz_id="rec-123")
+
+    track = Track.find_or_create(
+        title="TNT",
+        artist_name="AC/DC",
+        mbid="rec-123",
+        trust_webhook_data=True,
+    )
+
+    assert track.id == existing.id
+    assert track.id != wrong.id
+
+
+@pytest.mark.django_db
+@patch("music.models.resolve_track")
+def test_find_or_create_title_fallback_skips_track_with_conflicting_mbid(
+    mock_resolve,
+):
+    wrong = Track.objects.create(title="TNT", musicbrainz_id="rec-999")
+
+    track = Track.find_or_create(
+        title="TNT",
+        artist_name="AC/DC",
+        mbid="rec-123",
+        trust_webhook_data=True,
+    )
+
+    assert track.id != wrong.id
+    assert track.musicbrainz_id == "rec-123"
+    wrong.refresh_from_db()
+    assert wrong.musicbrainz_id == "rec-999"
+
+
+@pytest.mark.django_db
+@patch("music.models.resolve_track", return_value=(None, ""))
+def test_find_or_create_falls_back_to_title_and_artist(mock_resolve):
+    artist = Artist.objects.create(name="AC/DC")
+    wrong = Track.objects.create(title="TNT")
+    existing = Track.objects.create(title="TNT")
+    existing.artists.add(artist)
+
+    track = Track.find_or_create(
+        title="TNT",
+        artist_name="AC/DC",
+    )
+
+    assert track.id == existing.id
+    assert track.id != wrong.id
+
+
 @pytest.mark.django_db
 @patch("music.models.resolve_track")
 def test_fix_metadata_enriches_and_tags(mock_resolve):