removed secondary artists

src/migration/m20260323_000016_remove_orphaned_artists.rs

@@ -0,0 +1,25 @@
+use sea_orm_migration::prelude::*;
+
+#[derive(DeriveMigrationName)]
+pub struct Migration;
+
+#[async_trait::async_trait]
+impl MigrationTrait for Migration {
+    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
+        let conn = manager.get_connection();
+        conn.execute_unprepared(
+            "DELETE FROM artists WHERE id NOT IN (
+                SELECT DISTINCT artist_id FROM tracks WHERE artist_id IS NOT NULL
+                UNION SELECT DISTINCT artist_id FROM wanted_items WHERE artist_id IS NOT NULL
+                UNION SELECT DISTINCT artist_id FROM albums WHERE artist_id IS NOT NULL
+            )",
+        )
+        .await?;
+        Ok(())
+    }
+
+    async fn down(&self, _manager: &SchemaManager) -> Result<(), DbErr> {
+        // Orphaned artists cannot be restored
+        Ok(())
+    }
+}