Relinking accounts

If a user needs to be deleted from Keycloak & recreated, here's the steps to follow to relink their accounts:

• Forgejo: In manage user accounts if their Authentication Source is:
  • Local: Get them to log in with password, and tell them to go to https://git.boxfox.es/user/settings/security
  • bfx-auth: Set 'Authentication sign-in name' to the Keycloak user ID.
• Synapse:
  • Ensure the user does not try and log in with the new ID before reassigning the ID! (otherwise a new account will be created and will have to be deactivated)
  • Use the admin API to modify their external_ids to have the new account ID
• Tailscale: Contact Tailscale support. Either that or just delete their account and start fresh.