How to create a custom field in user profile and populate it from the database?

[Mikethemix]

How can I add a custom field "e-mail" that would appear in the User Profile and then populate that field from the database so it contains the user's email address?

Presumably that would need to be a CRON action to ensure that field remains up to date when a member changes their email address?
How to create a custom field in user profile and populate it from the database?

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