* fix(db): drop delete_user_account RPC that bypassed BFL retention
delete_user_account disabled the retention/immutability/audit triggers,
deleted audit_log rows, and cascaded auth.users, destroying 7 years of
legally retained rakenskapsinformation (BFL 7 kap 2 paragraf). It was
SECURITY DEFINER with only a self-only guard and no REVOKE, so any
authenticated user could call it via PostgREST.
The product path already uses anonymize_user_account, which so far
existed only on production (drift). This migration drops the dangerous
RPC, commits the prod definition of anonymize_user_account verbatim,
adds the profiles tombstone columns it writes (also drift), and locks
grants down to authenticated only.
Closes#342
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* docs: log profiles tombstone-column drift-capture decision
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
