add: mark all notifications as read/unread

fix: anonymous avatar/username

crates/core/src/database/notifications.rs

@@ -246,4 +246,26 @@ impl DataManager {
 
         Ok(())
     }
+
+    pub async fn update_all_notifications_read(&self, user: &User, read: bool) -> Result<()> {
+        let notifications = self.get_notifications_by_owner(user.id).await?;
+
+        if notifications.len() > 1000 {
+            return Err(Error::MiscError(
+                "Too many notifications to do this".to_string(),
+            ));
+        }
+
+        for notification in notifications {
+            if notification.read == read {
+                // no need to update this
+                continue;
+            }
+
+            self.update_notification_read(notification.id, read, user)
+                .await?
+        }
+
+        Ok(())
+    }
 }