After running the app with data seeding on PostgreSQL , when you register a new account on system, you will got an error related to "duplicate key value violates unique constraint PK_{Core_User}".
And this error is also occurs when you add a new entry of the entity that did seed data, ex: Address.
It seems a issue on Npgsql.EntityFrameworkCore.PostgreSQL like npgsql/efcore.pg#367
Considering workaround on this.