Implement `DELETE /user/pubkey/:pubKey`#159

Merged

ro-tex merged 6 commits intomainfrom ivo/delete_pubkey

Mar 25, 2022

+283-16

Commits on Mar 16, 2022

Implement DELETE /user/pubkey/:pubKey.
ro-tex
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Commits on Mar 18, 2022

Merge branch 'main' into ivo/delete_pubkey
ro-tex
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Commits on Mar 21, 2022

Use dedicated DB methods for adding and removing pubkeys from the user record.
ro-tex
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Return a 404 on delete request for a pubkey that doesn't exist.
ro-tex
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Fix the $addToSet on a null field. Thanks, PJ!
ro-tex
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Commits on Mar 24, 2022

More reliable pubkey deletion.
ro-tex
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