Change time to int

src/data_provider/card_stats.rs

@@ -30,7 +30,7 @@ pub fn add_stat(stat: &mut CardStatistics, connection: &Connection) {
                 &stat.word_id,
                 &stat.set_id,
                 &stat.score,
-                &stat.last_open,
+                &stat.last_open.timestamp(),
             ),
             |row| row.get(0)
         )
@@ -45,7 +45,7 @@ pub fn update_stat_score(stat: &CardStatistics, connection: &Connection){
                 "UPDATE card_stats SET score = ?1, last_opened = ?2 WHERE id = ?3",
                 (
                     &stat.score,
-                    &stat.last_open,
+                    &stat.last_open.timestamp(),
                     &stat.id
                 ),
             )