I can manage to create an ERD for your supermarket managment system, provided I get the information.
I'll create a first version and send it back for feedback to see if everything is correct, once we agree everything is correct you'll receive the full ERD with the right file to execute on a database to create the scheme.
Why you should choose me:
I have some free time, I could realise it quickly.
Got a 10/10 for databases (design and sql) when I followed that course at my university, I was the only one out of over 300 people to get a 10/10
I have multiple years experience creating databases.
P.S.
DDL/sql for creating database in mysql or oracle is easiest for me, other should be possible however I'd have to look in that.