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This fixes an OIDC sign-in edge case where a stale `external_login_user` record can still point to an organization or a deleted user. In that situation, Gitea may keep resolving the external login to the wrong account during sign-in. For affected instances, this matches the behavior reported in #36439 and #37812, where a user signing in with OIDC/Entra ID could appear as an organization, or hit a 404 after that organization was removed. - validate the user resolved from `external_login_user` during OAuth2/OIDC login - ignore stale links when the linked user no longer exists - ignore stale links when the linked user is not an individual user - remove the stale external login row so the sign-in flow can relink the external account to the correct user - Fixes #37812 - Related to #36439 --------- Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: Claude (Opus 4.8) <noreply@anthropic.com>