MySQL with Soft-Deletion, Unique Key and Foreign Key Constraints?

Add unique constraint on fields(username, deleted) Change field type for 'deleted' to INTEGER.

Just keep the unique index or contraint on username. You do not want new users to be able to use the deleted name, as not only could there be general confusion about identity, but if you are still showing the old posts from the deleted user, then they will mistakenly be understood to be posted by the new user with the same name.

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