Added the import/cleanup functionality

shanty-data/src/mb_import.rs

@@ -715,6 +715,9 @@ pub fn run_import(
          PRAGMA foreign_keys = OFF;",
     )?;
 
+    // Wrap entire import in a transaction so interrupted imports don't leave empty tables
+    conn.execute_batch("BEGIN;")?;
+
     let mut stats = ImportStats::default();
 
     // Import artists
@@ -818,6 +821,9 @@ pub fn run_import(
         rusqlite::params![stats.recordings.to_string()],
     )?;
 
+    // Commit the transaction — if we got here, everything succeeded
+    conn.execute_batch("COMMIT;")?;
+
     progress(&format!("Import complete: {stats}"));
     Ok(stats)
 }