DELETE /api/auth/users/:id ran a bare `DELETE FROM users`, but 23 columns
reference users(id) and only 4 cascade, so with foreign_keys=ON the delete
fails the moment the user is referenced anywhere - and a real user always is
(owns an org, created a workspace, has login activity). Reproduces on a fresh
DB, exactly as reported.
The schema also lacks cascades from workspaces -> tenant resources, so the DB
can't clean up on its own. New lib/user-deletion.js resolves every reference in
one transaction (defer_foreign_keys=ON for forgiving order; table-existence
guard for resilience):
- Refuse (409) if the user OWNS an organization that has other members -
don't nuke a shared tenant; transfer ownership first.
- Hard-delete the organizations they SOLELY own (workspaces + all contents).
- In orgs they don't own, PRESERVE resources: SET NULL the nullable
creator/inviter columns, and reassign the NOT NULL legacy creator user_id to
the resource's org owner (fallback: the acting admin).
- Memberships (organization_members/workspace_members/team_members/
content_folders) cascade on the user delete; pending invites they sent and
legacy teams they own are removed.
The handler now 404s an unknown id and 409s the shared-org case.
Tests (node:test): reproduces the FK failure, then verifies provisioned-member
delete (resources preserved + unlinked/reassigned), solo-org-owner cascade,
shared-org refusal (409), self-delete 400, non-superadmin 403, unknown 404.
Full suite 22/22. Verified end-to-end on a copy of a real DB: deleted a user
owning 2 solo orgs, foreign_key_check clean.
Closes#18.
