send scheckbuch people mail after using all trips

src/model/rower.rs

@@ -13,6 +13,13 @@ pub struct Rower {
 
 impl Rower {
     pub async fn for_log(db: &SqlitePool, log: &Logbook) -> Vec<User> {
+        let mut tx = db.begin().await.unwrap();
+        let ret = Self::for_log_tx(&mut tx, log).await;
+        tx.commit().await.unwrap();
+        ret
+    }
+
+    pub async fn for_log_tx(db: &mut Transaction<'_, Sqlite>, log: &Logbook) -> Vec<User> {
         sqlx::query_as!(
             User,
             "
@@ -22,7 +29,7 @@ WHERE id in (SELECT rower_id FROM rower WHERE logbook_id=?)
         ",
             log.id
         )
-        .fetch_all(db)
+        .fetch_all(db.deref_mut())
         .await
         .unwrap()
     }