RPF-WP-0018: mark unevidenced P1 claims; seed RPF-WP-0019 for apps-pg

Placement policy 3.1 records that the P1 levels for vergabe and
coulomb_social are provisioning declarations without the SS13 isolation
probes - apps-pg has none. 3.2 records that apps-pg cannot produce the
noisy-neighbour artifact at all until per-consumer controls exist, per
SS13.4: with nothing to bind, a probe could only demonstrate degradation.

RPF-WP-0019 seeded for the three live defects the disclosure work found:
no backup, no per-consumer controls, no isolation probes. Kept separate
from RPF-WP-0018 so declaring is not confused with fixing.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

workplans/RPF-WP-0019-apps-pg-recoverability-and-controls.md

@@ -0,0 +1,130 @@
+---
+id: RPF-WP-0019
+type: workplan
+title: "apps-pg: backup, per-consumer controls, and the isolation probes they make possible"
+domain: financials
+repo: railiance-platform
+status: proposed
+owner: codex
+topic_slug: railiance
+created: "2026-08-17"
+updated: "2026-08-17"
+related:
+  - RPF-WP-0018
+origin: residual
+origin_ref: RPF-WP-0018
+---
+
+# RPF-WP-0019 — apps-pg recoverability and per-consumer controls
+
+## Goal
+
+Close the three defects `RPF-WP-0018` surfaced in `apps-pg` by writing its
+quota disclosure. Documentation found them; only this workplan fixes them.
+
+## Why this is separate from RPF-WP-0018
+
+That workplan declared posture and policy. This one changes a live cluster.
+Keeping them apart matters: a declaration workplan that quietly starts editing
+production is how "we wrote it down" becomes indistinguishable from "we fixed
+it". The declaration is published as-is, with the defects visible, and this is
+the record of closing them.
+
+## The three defects
+
+**D1 — `apps-pg` has no backup.** No `barmanObjectStore`, no `retentionPolicy`,
+nothing. This is not a short retention window; it is no recovery path at all,
+on a cluster holding two S5 application databases. Its R level is `R0` and
+`R0` here means unrecoverable, not merely un-erasable.
+
+**D2 — no per-consumer controls.** The connection pool is unpartitioned, so
+one consumer can exhaust the cluster while staying politely inside its own
+expectations. No `statement_timeout`, no `idle_in_transaction_session_timeout`,
+no CPU or memory limits — the pod is BestEffort QoS and is the first thing
+evicted under node pressure.
+
+**D3 — no isolation probes**, so the `P1` levels recorded for `vergabe` and
+`coulomb_social` in `docs/placement-policy.md` §3.1 are provisioning
+declarations without the §13 artifact.
+
+## Sequencing, and why it is not the obvious one
+
+**D1 first.** It is the only one whose failure is unrecoverable. A cluster
+with no backup is one bad afternoon from data loss that no amount of isolation
+evidence compensates for.
+
+**D2 before D3, necessarily.** Tenancy Posture §13.4: an artifact must assert
+something achievable. The noisy-neighbour artifact requires showing the
+governance controls *bind*. With no controls there is nothing to bind, so a
+probe written now could only demonstrate degradation — an artifact that "can
+only fail, or that passes by being run gently enough". Writing the probe first
+would produce an overclaim wearing the costume of evidence.
+
+D1 also depends on a backup target, which is `resource-control`'s bucket and
+the `platform-pg-backup-s3` credential lane — the same handoff
+`make postgres-backup-deploy` waits on. Check whether that is now live before
+assuming this is blocked.
+
+## Tasks
+
+```task
+id: RPF-WP-0019-T01
+status: todo
+priority: high
+```
+**Establish a backup target for `apps-pg`.** Confirm the state of the
+`resource-control` bucket and the `platform-pg-backup-s3` OpenBao Secret; if
+live, configure `barmanObjectStore` and a `retentionPolicy` on the cluster. If
+not live, record the dependency and say so — do not leave the absence
+undocumented a second time.
+
+```task
+id: RPF-WP-0019-T02
+status: todo
+priority: high
+```
+**Declare and enforce per-consumer controls.** Per-consumer connection
+allowance, `statement_timeout`, `idle_in_transaction_session_timeout`, and
+pod resource requests/limits to lift `apps-pg` off BestEffort QoS. Publish
+every value in `docs/s3-consumer-interfaces.md` before it takes effect —
+§10.2 is a disclosure rule, and applying a timeout consumers learn about by
+hitting it would breach the rule while implementing it.
+
+```task
+id: RPF-WP-0019-T03
+status: todo
+priority: medium
+```
+**Declare the ceiling and overflow target.** Owed under this repo's own
+Rule P-4.1 before `apps-pg`'s third consumer; it is at two. Name the binding
+resource per Rule P-4.2 — memory or connections — and a named overflow
+substrate per P-4.3.
+
+```task
+id: RPF-WP-0019-T04
+status: todo
+priority: medium
+```
+**Isolation probes, after T02.** Consumer-boundary probes on the
+`rapp-postgres` model, then the §13 noisy-neighbour artifact: per-consumer
+baseline, saturation run, evidence the controls bind, degradation measured and
+judged against each consumer's declared service class. Update
+`docs/placement-policy.md` §3.1 and `docs/tenancy-posture.md` when the P1
+claims become evidenced.
+
+## Boundaries
+
+- `apps-pg` only. `platform-pg`'s equivalents are `rapp-postgres`'s.
+- No consumer is migrated. This changes the cluster, not who is on it.
+- Values are published before they are enforced, never after.
+
+## Risks
+
+**Applying limits to a live cluster breaks a consumer that was relying on
+their absence.** Most likely with `statement_timeout`. Mitigation is the
+disclosure-first ordering in T02, which gives consumers a window to object.
+
+**T01 stays blocked on a handoff outside this repo and the cluster keeps no
+backup meanwhile.** Mitigation is that T01 requires the dependency be recorded
+explicitly rather than left as a silent absence — which is exactly how D1
+survived this long.