Fix history bug

src/data_provider/card_stats.rs

@@ -73,15 +73,6 @@ pub fn update_stat_score(stat: &CardStatistics, connection: &Connection) {
     println!("Updated stat: {}", time.elapsed().as_millis());
 }
 
-pub fn delete_stat(stat: &CardStatistics, connection: &Connection) {
-    if !stat.id.is_valid() {
-        return;
-    }
-    connection
-        .execute("DELETE FROM card_stats WHERE id = ?1", (&stat.id,))
-        .unwrap();
-}
-
 pub fn delete_stats(stat: &[CardStatistics], connection: &Connection) {
     if stat.is_empty() {
         return;