When I am accessing Fast User Switching, there is a PostgreSQL account:
I am aware that I can hide this account, but it would be ideal to delete it completely.
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The first place to look for accounts is System Preferences > Users & Groups. If the account is listed there, you can delete it by selecting it and pressing the minus button (you may need to press the lock button to enable changes):
If the account is not listed in System Preferences > Users & Groups, you can use the Directory Utility app:
NFSHomeDirectoryis the user's home directory, it may contain files you want to keep.
UniqueIDis the User ID that unambiguously identifies files owned by the user - you can find those files with this command:
find / -uid <UniqueID> 2>/dev/null.)