I **think** I've at least 99% fixed the top songs mismatch

src/tagger.rs

@@ -1,4 +1,4 @@
-use sea_orm::{ActiveValue::NotSet, ActiveValue::Set, DatabaseConnection};
+use sea_orm::{ActiveModelTrait, ActiveValue::NotSet, ActiveValue::Set, DatabaseConnection};
 use shanty_data::{MetadataFetcher as MetadataProvider, RecordingDetails, ReleaseRef};
 use shanty_db::entities::track;
 use shanty_db::queries;
@@ -78,6 +78,22 @@ pub async fn tag_track(
         return Ok(true);
     }
 
+    // If the resolved MBID differs from the track's original MBID, update the wanted_item
+    // so the cleanup step doesn't delete files whose MBID changed during tagging
+    if let Some(ref old_mbid) = track.musicbrainz_id
+        && old_mbid != &details.mbid
+        && let Ok(Some(wanted)) = queries::wanted::find_by_mbid(conn, old_mbid).await
+    {
+        let mut active: shanty_db::entities::wanted_item::ActiveModel = wanted.into();
+        active.musicbrainz_id = Set(Some(details.mbid.clone()));
+        let _ = active.update(conn).await;
+        tracing::info!(
+            old_mbid = %old_mbid,
+            new_mbid = %details.mbid,
+            "updated wanted_item MBID after tagger fallback"
+        );
+    }
+
     // Use existing artist_id if already set (e.g., from download pipeline).
     // Only upsert from MB when the track has no artist association yet.
     let artist_id = if track.artist_id.is_some() {
@@ -121,14 +137,22 @@ pub async fn tag_track(
 
     let genre = details.genres.first().cloned();
 
-    // Update track metadata
+    // Update track metadata — preserve artist name when artist_id was already set
+    let artist_name_for_track = if track.artist_id.is_some() {
+        track
+            .artist
+            .clone()
+            .or_else(|| Some(details.artist.clone()))
+    } else {
+        Some(details.artist.clone())
+    };
     let active = track::ActiveModel {
         id: Set(track.id),
         file_path: Set(track.file_path.clone()),
         title: Set(Some(details.title.clone())),
-        artist: Set(Some(details.artist.clone())),
+        artist: Set(artist_name_for_track.clone()),
         album: Set(album_name),
-        album_artist: Set(Some(details.artist.clone())),
+        album_artist: Set(artist_name_for_track),
         musicbrainz_id: Set(Some(details.mbid.clone())),
         artist_id: Set(artist_id),
         album_id: Set(album_id),