Julien Gautier f4f9224c68 fix(portal-bff): audit writes use raw INSERT (audit_writer has no SELECT for RETURNING)
manual smoke after #120 returned 500 on the first /auth/logout :

  PostgresError code 42501 — permission denied for table events

acl looked correct (audit_writer=a/audit_owner), has_*_privilege
returned t everywhere, and a manual psql `INSERT INTO audit.events`
succeeded after SET LOCAL ROLE audit_writer. but the same INSERT
WITH `RETURNING id` failed with the exact same error.

root cause: tx.auditEvent.create() in prisma emits `INSERT …
RETURNING *` to hydrate the entity it returns, and postgres requires
SELECT on every column in RETURNING. audit_writer has INSERT only
per adr-0013's append-only-by-role contract. RETURNING fails with
"permission denied for table X" — and the message says nothing
about SELECT or RETURNING, which made the bug take a long debug
session to isolate.

fix: AuditWriter.recordEvent now uses tx.$executeRawUnsafe with a
parameterised raw INSERT instead of the orm create(). the role
contract stays strict (audit_writer keeps INSERT only — no SELECT,
UPDATE, DELETE, TRUNCATE). the alternative — GRANT SELECT to
audit_writer — would have collapsed the writer / reader role
separation that adr-0013 hinges on, so we went the other way.

bonus: also fixes an env-sensitivity bug in auth.controller.spec.ts.
the test asserting `session.absoluteExpiresAt == createdAt +
43_200 * 1000` was reading the default via readSessionTimeouts() but
didn't override SESSION_ABSOLUTE_TIMEOUT_SECONDS. apps/portal-bff/
.env may carry a custom value (it did during the audit debugging),
making the test fail non-deterministically. now it deletes the env
var before, restores after — same pattern as the other env-touching
tests in this file.

144/144 specs pass under the clean-env repro:
  env -u REDIS_URL -u SESSION_SECRET -u SESSION_ENCRYPTION_KEY \
      -u SESSION_IDLE_TIMEOUT_SECONDS -u SESSION_ABSOLUTE_TIMEOUT_SECONDS \
      -u LOG_USER_ID_SALT -u DATABASE_URL -u ENTRA_* \
      pnpm exec nx run-many -t test lint build --projects=portal-bff

notable shape choices:
  - gen_random_uuid() server-side instead of prisma's @default(uuid())
    client-side. the model still declares @default for future orm reads
    by audit_reader; the write path now uses postgres's built-in
    (available since 13, target is 17).
  - explicit enum + jsonb casts ($2::"audit"."AuditAudience" etc.)
    because parameters travel as TEXT on the wire.
  - parameterised via $1, $2, …; never interpolated. a spec pins this
    with a sql-injection-shaped eventType input.

unchanged: schema, migration, role grants, ADR-0013 contract.
2026-05-13 18:07:06 +02:00

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