What should be done?

We should implement the basic dropUser command.

It should remove the user from the system.users collection in the admin database.

We should test that data is removed using the regular find command.

Where?

https://github.com/FerretDB/FerretDB/tree/main/internal/handler

Definition of Done

• handler updated;
• integration/compatibility tests added/updated;
• spot refactorings done.