Files
atomic-design-poc/docs/project/backlog/WP-66-behandelportal-openzaak-write.md
T
ehoandClaude Sonnet 5 3ff80c124f feat(openzaak): bounded retry + flagged write divergence (WP-60)
Local aanvraag/document writes and their paired ZGW writes aren't
transactional; a ZGW failure after the local write succeeds used to
diverge silently. ZgwHttpClient now retries transport-shaped failures
(not 500, which can follow a partial commit on the non-idempotent
statussen/rollen POSTs), and a ZGW failure that survives retry sets
Aanvraag.ZgwError plus a zgw:divergence audit row instead of failing
or diverging quietly. No outbox/reconcile job: three request-triggered
write paths don't justify a persisted queue that would also need to
carry citizen PII for the JWT audit claims.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-07-30 18:11:55 +02:00

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# WP-66 — Wire the decision into OpenZaak
Status: todo
Phase: 11 — Behandelportal
## Why
WP-65's decision currently only updates local state (`LocalZaakSource`). For the
behandelportal to actually function against a real register, the recorded decision needs
to also write a besluit/status transition to ZGW — extending the write capability that
already partially exists (`CreateStatusRequest`, `CreateRolRequest` in
`OpenZaakZaakSource.cs`) rather than building a new ZGW client from scratch.
## Read first
- `backend/src/BigRegister.Api/Zgw/OpenZaakZaakSource.cs` (existing write records)
- ZGW's Besluiten API (referenced in `openzaak-integration.md` if covered, or the ZGW
standard docs) for besluit creation
- [WP-50](WP-50-openzaak-create-zaak.md) (the first ZGW write slice, for the pattern to
follow)
## Decisions (pre-made, don't relitigate)
- Extend `IZaakSource`/`OpenZaakZaakSource` with a besluit/status-transition write,
following the same pattern WP-50 established for create-zaak (a records + mapper
addition, not a new abstraction).
- Gated by `Zgw:Enabled` like every other ZGW write — the behandelportal keeps working
against `LocalZaakSource` when it's off.
- Best done after Phase 10's WP-60 (write-divergence resilience) lands, since this is
exactly the second write pair that resilience work should already cover — but not
strictly blocked on it if Phase 10 is still in progress (call out the residual risk
explicitly if shipped first).
## Files
`Zgw/OpenZaakZaakSource.cs` (besluit/status write), `Data/IZaakSource.cs` (new write
method), tests.
## Steps
1. Add the besluit/status-transition write to `OpenZaakZaakSource`, mirroring WP-50's
create-zaak pattern.
2. Wire WP-65's decision command to call it when `Zgw:Enabled=true`.
3. Integration test against the WP-54 harness (extend `OpenZaakIntegrationTests`).
## Acceptance criteria
- [ ] A recorded decision writes a real besluit/status transition to OpenZaak when
`Zgw:Enabled=true`.
- [ ] Behandelportal still works unchanged against `LocalZaakSource` when
`Zgw:Enabled=false`.
- [ ] `OpenZaakIntegrationTests` covers the new write.
## Verification
`cd backend && dotnet test --filter Category=Integration` against the (ideally
Phase-10-hardened) OpenZaak harness; manual smoke with `Zgw:Enabled=true`.
## Out of scope
Any further behandelportal screens beyond beoordeling.
## Risks
WP-60 (write-divergence resilience) has landed: bounded retry lives in `ZgwHttpClient`, so
this write pair inherits it automatically. It does **not** get the flagging half for free —
call `RecordZgwDivergence` (or the equivalent for whichever endpoint hosts the besluit write) on
this path's catch too, the same way `Program.cs`'s submit endpoint does for create-zaak/document
writes, or this becomes the "second, currently-unprotected write pair" WP-60's own scope note
anticipated.
Depends on: WP-65.