Await DB write and add UID cache key

Make the DB update in AppES awaitable so the write completes before proceeding (avoids race conditions). Also add invalidation of the Redis object key for the app UID in AppInformationService to ensure cached entries keyed by uid are cleared after updates.

src/backend/src/modules/apps/AppInformationService.js

@@ -123,6 +123,10 @@ class AppInformationService extends BaseService {
                         value: appUid,
                         rawIcon: false,
                     }),
+                    AppRedisCacheSpace.objectKey({
+                        lookup: 'uid',
+                        value: appUid,
+                    }),
                 ]),
                 AppRedisCacheSpace.invalidateAppStats(appUid),
             ]);

src/backend/src/om/entitystorage/AppES.js

@@ -300,7 +300,7 @@ class AppES extends BaseES {
                 };
                 await svc_event.emit('app.new-icon', event);
                 if ( typeof event.url === 'string' && event.url ) {
-                    this.db.write(
+                    await this.db.write(
                         'UPDATE apps SET icon = ? WHERE id = ? LIMIT 1',
                         [event.url, insert_id],
                     );