send welcome mail to new members

src/model/notification.rs

@@ -69,6 +69,18 @@ impl Notification {
         }
     }
 
+    pub async fn create_for_role(
+        db: &SqlitePool,
+        role: &Role,
+        message: &str,
+        category: &str,
+        link: Option<&str>,
+    ) {
+        let mut tx = db.begin().await.unwrap();
+        Self::create_for_role_tx(&mut tx, role, message, category, link).await;
+        tx.commit().await.unwrap();
+    }
+
     pub async fn for_user(db: &SqlitePool, user: &User) -> Vec<Self> {
         let rows = sqlx::query!(
             "