replace unnecessary check when updating device keys

Signed-off-by: June Clementine Strawberry <june@3.dog>

src/api/client/backup.rs

@@ -290,7 +290,7 @@ pub(crate) async fn add_backup_keys_for_session_route(
 					new_forwarded_count < old_forwarded_count
 				},
 			};
-		};
+		}
 	}
 
 	if ok_to_replace {

src/api/client/keys.rs

@@ -80,14 +80,26 @@ pub(crate) async fn upload_keys_route(
 			)));
 		}
 
-		// TODO: merge this and the existing event?
+		if let Ok(existing_keys) = services
-		// This check is needed to assure that signatures are kept
-		if services
 			.users
 			.get_device_keys(sender_user, sender_device)
 			.await
-			.is_err()
 		{
+			if existing_keys.json().get() == device_keys.json().get() {
+				debug!(
+					?sender_user,
+					?sender_device,
+					?device_keys,
+					"Ignoring user uploaded keys as they are an exact copy already in the \
+					 database"
+				);
+			} else {
+				services
+					.users
+					.add_device_keys(sender_user, sender_device, device_keys)
+					.await;
+			}
+		} else {
 			services
 				.users
 				.add_device_keys(sender_user, sender_device, device_keys)