If you are facing db permission error then best suggestion is to
1. Create a new db user and db password using Plesk panel to the same database and try to access database using that and see if that works. You can use your newly created db user itself in your backend coding to access the database
2. If this is mandatory for you to have the same user repaired then steps are as follows:
A) Take full backup downloaded at your end of required db first to be safe side from Plesk panel.
B) Now delete that db user (we requesting to delete db user only not the database)
C) Now recreate that same db user in the same database.
D) Confirm its working fine now.
For any additional query feel free to contact our technical team at support@webji.services
The primary reasons of such issue are
A) You have restored a db backup from your local pc to server side database recently that have created such issue
B) Any of your SQL Queries have resulted in permission to be disturbed for the user.