When you delete a database by accidentally, you can undelete it with the steps below
1. Please login to your Hosting Control Panel-->DATABAESES-->MSSQL, you can see yellow "Undelete" button there
2. Click it, you will see a pop up windows from where you can select the backup point of the database, select the corresponding backup point and submit, the deleted database would be restored.
Note: You only have 7 days to recover the database from the day you delete it.