Fix:Applying backup not properly overwriting existing sqlite file

- Fixed resetting api cache on backup
- Added loading indicator in backups table
- Fixed apply backup api not responding with 200 http status code
- Added additional logging and failsafes

server/Database.js

@@ -217,7 +217,6 @@ class Database {
   async disconnect() {
     Logger.info(`[Database] Disconnecting sqlite db`)
     await this.sequelize.close()
-    this.sequelize = null
   }
 
   /**