[FEATURE REQUEST]: Implement "Unsubscribe" for email alerts

[dennisgsmith]

Feature Request Type

• User Interface (UI)
• Application Programming Interface (API)

Is your feature request related to a problem? Please describe.

Emails sent via SMTP are assigned by project administrators within MIDAS. If a user no longer wishes to receive emails, the current workflow is to contact the project admin or site administrators.

Describe the solution you'd like

There should be an easy way to "unsubscribe" yourself from email alerts, via a link in the email.

Describe alternatives you've considered

• If we restrict all emails to user profiles authenticated with Keycloak, we can require a sign-in for the user to unsubscribe. This is the preferred method.
• If alerts to emails which do NOT have MIDAS profiles must be handled, we must implement a unique nonce hash for each subscription and send it with the user id in each email to allow an unsubscribe link to be created.