Release assignments on Go Offline + auto-release stale assignments after 12h (#135)

[spizeck]

Closes #135. Direct follow-up to PR #124 / issue #123 — #124 is merged into main (d53cefb); this PR is rebased onto main and contains only the #135 lifecycle work.

Audit findings

• Go Offline previously released nothing. setAvailabilityByLinkedUser was a single non-transactional availabilityStatus update; an assigned driver could go offline while silently holding a claimed request and activeRequestId.
• No assignment timeout existed. A claimed request stayed locked indefinitely unless the driver released it or staff intervened.
• claimedAt is written on every assignment path (auto-claim, dispatcher assign/reassign, batch) and cleared on release — it is the canonical current-assignment clock.

What changed

Go Offline (driver-initiated release):

• setAvailabilityByLinkedUser is now transactional: going offline releases every ordinary (non-Delivery-Run) claimed request in the same transaction — request → available, assignedDriverId/claimedAt cleared, activeRequestId cleared conditionally.
• Counts as a decline (ledger record + daily limit/cooldown) so the toggle can't bypass decline policy — tagged releaseContext/trigger: "driver_went_offline" for honest audit.
• Recorded water collection → DRIVER_HAS_COMMITTED_DELIVERY; the driver stays online. Delivery Run members are skipped and never block. Duplicate presses are idempotent (no redundant events).
• UI: confirmation step when going offline while holding an ordinary assignment; clear error copy for the committed-work case.

12-hour stale-assignment sweep:

• New releaseStaleAssignments() (src/lib/domain/staleAssignments.ts) + cron GET /api/cron/stale-assignments (hourly at :11, CRON_SECRET, stale-assignments heartbeat, watchdog + check-cron-heartbeats.mjs registered).
• Two-phase: bounded status == "claimed" scan → per-candidate transaction re-validating the same assignment (same assignedDriverId AND identical claimedAt), still past threshold, no collections, no batch — so a stale candidate can never release delivered/cancelled/reassigned/collected/run work.
• No driverOffers record, no decline count, no cooldown — system recovery, audited as assignment_auto_released on the request (actor null) and registry (actor system), never driver_released.
• Missing claimedAt on a claimed doc = anomaly counted in missingClaimedAt, never released on guesswork.

Test plan

• 27 new emulator tests (driverLifecycleRelease.emulator.test.ts): offline release, committed-work block, run-member skip, lock semantics, decline/cooldown accounting, idempotency, concurrent cancel/reassign/deliver, boundary timing, sweep races, missing claimedAt, overlapping/missed runs.
• npm run format:check / lint / typecheck / test (926) / build / test:rules (269) / test:auth-emulator (5) / test:e2e (36) / docs:check-links / check — all green.

Deployment notes

• New Vercel cron stale-assignments (hourly) must be enabled by plan limits — Hobby plan allows limited crons; verify before relying on it.
• First run after deploy may release any legitimately stale assignments — expected.
• No data migration required; claimedAt already exists on all assignment paths.

Generated with Devin

Summary by Sourcery

Close assignment lifecycle gaps by releasing ordinary work when drivers explicitly go offline and automatically recovering assignments left claimed for 12 hours.

New Features:

• Automatically return ordinary assignments to dispatch after 12 hours of inactivity through a protected scheduled sweep.
• Allow drivers to release ordinary unstarted assignments by explicitly going offline, with confirmation and existing decline-limit accounting.

Bug Fixes:

• Prevent drivers from going offline while silently retaining ordinary claimed work.
• Prevent stale or missing assignment state from incorrectly releasing completed, collected, reassigned, cancelled, or Delivery Run work.

Enhancements:

• Make assignment release and availability changes transactional and race-safe.
• Add distinct system audit events, monitoring, heartbeat checks, and operational visibility for automatic assignment releases.
• Update driver, dispatcher, product, technical, and release documentation for the new assignment lifecycle.

Deployment:

• Add the hourly protected stale-assignment Vercel cron and register its heartbeat watchdog.

Documentation:

• Document Go Offline release behavior, committed-work restrictions, Delivery Run exemptions, and 12-hour automatic assignment recovery.

Tests:

• Add emulator coverage for offline release, decline accounting, idempotency, committed work, Delivery Runs, concurrency races, timeout boundaries, reassignment, anomalies, and overlapping or missed sweeps.

Summary by CodeRabbit

• New Features
  • Drivers can release an ordinary assigned delivery by going offline after confirmation. It counts toward the daily release limit; recorded water collection prevents going offline, while Delivery Run assignments are unaffected.
  • Untouched ordinary assignments return to dispatch automatically after 12 hours, with reassignment restarting the timer. This system release does not count toward decline limits or trigger cooldowns.
  • Assignment histories identify deliveries returned to dispatch automatically.
• Documentation
  • Updated driver, dispatcher, and operations guidance to explain the release rules.

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Project	Deployment	Actions	Updated
saba-water-delivery	Ready	Preview	Oct 5, 2026 4:08pm UTC

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📒 Files selected for processing (1)

• src/app/api/cron/stale-assignments/route.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• src/app/api/cron/stale-assignments/route.ts

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📝 Walkthrough

Walkthrough

The change adds transactional assignment release when a driver goes offline and a scheduled sweep that returns eligible assignments claimed for 12 hours. It updates driver confirmation and messaging, records release events, and adds cron monitoring, tests, and lifecycle documentation.

Changes

Assignment release lifecycle

Layer / File(s)	Summary
Transactional Go Offline release src/lib/domain/driverRegistry.ts, src/app/driver/*, src/lib/domain/__tests__/driverLifecycleRelease.emulator.test.ts, docs/*, PRODUCT.md, DEVIN.md, TECHNICAL.md, wiki-draft/*	Going offline releases eligible ordinary assignments with decline accounting. Recorded water collection blocks the offline transition, while Delivery Run assignments remain assigned. The driver page and toggle show assignment-specific confirmation and results.
Stale-assignment sweep and cron src/lib/domain/staleAssignments.ts, src/app/api/cron/stale-assignments/route.ts, src/lib/domain/config.ts, src/lib/domain/types.ts, src/lib/monitoring/cronHeartbeat.ts, src/lib/utils/formatAuditEvent.ts, scripts/check-cron-heartbeats.mjs, vercel.json, src/lib/domain/__tests__/driverLifecycleRelease.emulator.test.ts, docs/*, TECHNICAL.md, DEVIN.md, PRODUCT.md	An hourly cron scans up to 500 claimed requests and transactionally revalidates eligible assignments before returning them to dispatch. The sweep records assignment_auto_released events without decline accounting or cooldown. Cron heartbeat checks and audit-event formatting cover the new path.

Priority: ➖ Normal

Merge Risk: ⚪ Minimal · up to c3ef4

This change adds a protected hourly sweep that releases stale driver assignments. No actionable merge-blocking risk was identified in the reviewed portion.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to b5df1

The release transactions protect collected work and concurrent reassignment, and both entrypoints authenticate callers. However, an in-flight availability action can apply newly added cleanup and cooldown changes to a driver record whose account link has changed. The scheduled recovery also lacks guaranteed progress beyond its scan limit and reports successful health even when individual releases fail.

Retained concerns

• Medium · security · inferred: An availability action retains the registry reference resolved before its transaction without validating the current account link. If staff unlink and relink accounts while that action is in flight, it can clear the former record's current owner's lock or apply cooldown there while releasing requests belonging to the original caller. The stale-reference pattern existed at the base, but these cleanup and cooldown effects are newly added.
• Medium · reliability · inferred: The new recovery scan has a 500-document limit but no cursor or pagination. Protected claims remain in the queried status, so a persistent first page of protected claims can leave later eligible assignments unexamined indefinitely. The truncated result reports saturation but does not advance recovery, weakening the new assignment-hoarding containment mechanism.
• Medium · reliability · observed: Individual release failures are caught and counted, but a resolved sweep always records a success heartbeat. Repeated failures can therefore leave assignments held while refreshing lastSuccessAt and resetting consecutiveFailures. Logs and response counts provide counterevidence to complete invisibility, but the registered heartbeat-based recovery monitoring does not represent those failures.

Security review details

Security Blast Radius

• observed — The cron's authenticated service authority scans the configured waterRequests collection without a driver-specific filter and can release any selected assignment that passes transactional eligibility checks. Each invocation examines at most 500 claims. The driver action instead selects requests assigned to its authenticated session UID.

Security Findings and Attack Paths

• inferred — The supported security concern is a constrained ownership race, not anonymous access: a driver action authorized before staff unlinking can retain its former registry target through relinking and affect that record's new owner's cleanup or cooldown state. Unlinking blocks existing claims, so the damaging sequence requires new work after the link changes. The original caller cannot supply another driver's UID, and the downstream claim fallback prevents concluding that clearing a lock alone permits an extra assignment.

Trust Boundaries and Controls

• observed — Driver actions verify a Firebase session cookie with revocation checking, load the user profile, reject merged identities and require the driver role before supplying session.uid. The cron checks its bearer secret before invoking database recovery or recording a heartbeat.

Resilience and Maintainability Implications

• inferred — Transaction-side assignment checks contain reassignment and repetition risks, but eventual recovery depends on scan progress and effective failure monitoring. A persistent protected first page can starve later claims, while recurring release errors can coexist with fresh success heartbeats. These limitations weaken the new recovery control without establishing a production outage or an attacker-triggered saturation event.

🚥 Pre-merge checks | ✅ 2 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	Issue [#135] requires a bounded stale-assignment sweep that releases eligible claims and remains safe across repeated runs. The offline release transaction, committed-work block, Delivery Run exclusio…	Make the bounded sweep guarantee progress through all claimed requests, such as by prioritizing oldest claimedAt values or using durable pagination, while retaining anomaly handling and transaction revalidation. Add a test with more than …
Out of Scope Changes check	⚠️ Warning	The change moves DRIVER_WORKFLOW_NOTICE_BANNER_LAST_SABA_DATE from 2027-03-31 to 2026-10-31 and updates date tests. Issue [#135] requires the versioned workflow notice to advance to v2. It does …	Remove the temporary banner cutoff change and its date-test changes, or provide evidence that changing this cutoff is required for issue [#135].

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely identifies both main changes: releasing assignments when a driver goes offline and automatically releasing stale assignments after 12 hours.
Description check	✅ Passed	The description provides a detailed summary, links the related issue, and includes implementation details, tests, and deployment notes. Some template sections need attention: change type and affected …

Full details: Linked Issues check

Explanation

Issue [#135] requires a bounded stale-assignment sweep that releases eligible claims and remains safe across repeated runs. The offline release transaction, committed-work block, Delivery Run exclusion, decline accounting, stale-claim revalidation, audit events, cron protection, v2 notice, and documentation are present. However, releaseStaleAssignments() scans .where("status", "==", "claimed").limit(500) without age ordering or continuation state. If the first 500 claims remain non-stale or are repeatedly reassigned, older eligible claims beyond them can be omitted on every run. truncated reports the condition but does not advance the scan.

Resolution

Make the bounded sweep guarantee progress through all claimed requests, such as by prioritizing oldest claimedAt values or using durable pagination, while retaining anomaly handling and transaction revalidation. Add a test with more than 500 claimed requests where earlier scanned records remain fresh and later records are stale.

Full details: Out of Scope Changes check

Explanation

The change moves DRIVER_WORKFLOW_NOTICE_BANNER_LAST_SABA_DATE from 2027-03-31 to 2026-10-31 and updates date tests. Issue [#135] requires the versioned workflow notice to advance to v2. It does not establish a connection between that requirement and the separate temporary banner cutoff.

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Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
🔒 Security Review	✅ Completed 2026-10-05T14:25:42.275074Z	391449d	PR opened

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[sourcery-ai]

Reviewer's Guide

The PR closes two assignment-hostage paths: Go Offline now transactionally releases eligible ordinary assignments with normal driver-decline accounting, while an authenticated hourly sweep safely returns unchanged ordinary assignments older than 12 hours without penalizing drivers; UI, audit events, monitoring, documentation, and emulator coverage are updated accordingly.

Sequence diagram for Go Offline assignment release

sequenceDiagram
    actor Driver
    participant UI as AvailabilityToggle
    participant Domain as setAvailabilityByLinkedUser
    participant Firestore
    participant Policy as DeclinePolicy

    Driver->>UI: Go Offline
    UI->>Driver: Confirm release or stay online
    Driver->>UI: Confirm Go Offline
    UI->>Domain: setAvailabilityByLinkedUser(userId, offline)
    Domain->>Firestore: Transactionally read driver and claimed requests
    alt committed ordinary delivery
        Domain-->>UI: DRIVER_HAS_COMMITTED_DELIVERY
        UI-->>Driver: Remain online, complete or contact office
    else releasable ordinary assignments
        Domain->>Policy: Apply decline count and cooldown
        Domain->>Firestore: Return requests to available
        Domain->>Firestore: Clear assignment and activeRequestId
        Domain->>Firestore: Write driver_released audit events
        Domain->>Firestore: Set driver offline
        Domain-->>UI: releaseOutcome
        UI-->>Driver: Offline with release-limit result
    else only Delivery Run assignments
        Domain->>Firestore: Skip run members and set driver offline
        Domain-->>UI: No release outcome
    end

Loading

Sequence diagram for stale assignment release sweep

sequenceDiagram
    participant Cron as GET /api/cron/stale-assignments
    participant Sweep as releaseStaleAssignments
    participant Firestore
    participant Request as waterRequest
    participant Registry as driverRegistry

    Cron->>Cron: Validate CRON_SECRET
    Cron->>Sweep: releaseStaleAssignments()
    Sweep->>Firestore: Scan claimed requests, limit 500
    Sweep->>Sweep: Select valid claimedAt at least 12h old
    Sweep->>Request: releaseStaleAssignmentIfUnchanged(requestId, driverId, claimedAt)
    Request->>Firestore: Transactionally re-read assignment
    alt same driver and claimedAt and still safe to release
        Request->>Firestore: Set request available and clear assignment
        Request->>Registry: Clear activeRequestId if it matches
        Request->>Firestore: Write assignment_auto_released events
        Request-->>Sweep: released
    else changed, delivered, collected, or Delivery Run
        Request-->>Sweep: skipped_stale or skipped_not_releasable
    end
    Sweep-->>Cron: Aggregate counts
    Cron->>Firestore: recordCronHeartbeat(stale-assignments, success)

Loading

Entity relationship diagram for assignment timeout state

erDiagram
    WATER_REQUESTS {
        string status
        string assignedDriverId
        timestamp claimedAt
        string dispatchBatchId
        array loadCollections
    }
    DRIVER_REGISTRY {
        string linkedUserId
        string activeRequestId
        string availabilityStatus
    }
    REQUEST_EVENTS {
        string type
        string actorId
        timestamp createdAt
    }
    DRIVER_EVENTS {
        string type
        string actorRole
        timestamp createdAt
    }
    DRIVER_REGISTRY ||--o{ WATER_REQUESTS : claims
    WATER_REQUESTS ||--o{ REQUEST_EVENTS : audits
    DRIVER_REGISTRY ||--o{ DRIVER_EVENTS : audits

Loading

File-Level Changes

Change	Details	Files
Make Go Offline atomically release ordinary claimed assignments while preserving committed and Delivery Run work.	Converted availability updates to a transaction that revalidates claimed requests and active-request locks. Returned ordinary assignments to the queue with cleared assignment fields and existing decline/cooldown accounting. Blocked offline transitions when collected work exists, skipped Delivery Run members, and made repeated transitions idempotent. Added driver confirmation UI and result/error messaging for releasable and committed assignments.	src/lib/domain/driverRegistry.ts src/app/driver/actions.ts src/app/driver/AvailabilityToggle.tsx src/app/driver/page.tsx src/app/driver/WorkflowNoticeModal.tsx
Add a race-safe 12-hour stale-assignment recovery sweep.	Introduced a bounded claimed-request scan driven by canonical current-assignment claimedAt timestamps. Revalidated status, driver, claimedAt identity, age, collection state, and Delivery Run membership in per-request transactions. Released safe stale assignments without decline ledger entries, cooldowns, or driver-release events. Tracked anomalies, skips, failures, truncation, and overlap/missed-run behavior for operational recovery.	src/lib/domain/staleAssignments.ts src/app/api/cron/stale-assignments/route.ts src/lib/domain/config.ts
Integrate, audit, monitor, and document the new assignment lifecycle.	Registered the protected hourly Vercel cron, heartbeat, watchdog expectation, and query-shape contracts. Added assignment_auto_released request and driver event types, labels, metadata, and system actor semantics. Updated assignment-path documentation, ADRs, product/driver/dispatcher guidance, changelog, and workflow notice version.	vercel.json src/lib/monitoring/cronHeartbeat.ts scripts/check-cron-heartbeats.mjs src/lib/firebase/indexContract.ts src/lib/domain/types.ts src/lib/utils/formatAuditEvent.ts DEVIN.md PRODUCT.md TECHNICAL.md docs/CHANGELOG.md docs/DATA_MODEL.md docs/DISPATCHER_GUIDE.md docs/DRIVER_GUIDE.md docs/OPERATIONS.md docs/PRODUCTION_READINESS_TEST_MATRIX.md docs/adr/0021-assignment-on-visibility-dispatch.md wiki-draft/Driver-Guide.md wiki-draft/System-Concepts.md
Add emulator coverage for release semantics and concurrency safety.	Covered offline release accounting, committed-work blocking, Delivery Run exemptions, lock cleanup, idempotency, and concurrent lifecycle races. Covered stale threshold boundaries, reassignment identity protection, collected/run exclusions, missing claimedAt anomalies, and overlapping or missed sweeps.	src/lib/domain/__tests__/driverLifecycleRelease.emulator.test.ts

Possibly linked issues

• Release ordinary assignments on explicit Go Offline + auto-release stale assignments after 12h #135: The PR directly implements the issue’s Go Offline release, 12-hour sweep, audit, accounting, UI, and documentation requirements.

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @src/app/api/cron/stale-assignments/route.ts:
- Around line 51-59: Update the heartbeat status in the stale-assignment route
after releaseStaleAssignments() so result.failed greater than zero records a
failure heartbeat, while zero failures records success. Preserve the existing
200 response and aggregate result counts for partial progress.

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ℹ️ Review info

⚙️ Run configuration

• Configuration used: Organization UI
• Review profile: CHILL
• Plan: Advanced
• Run ID: a447ea13-d796-42f7-8ade-99625795c401

📥 Commits

Reviewing files that changed from the base of the PR and between d53cefb and b5df1cb.

📒 Files selected for processing (29)

• DEVIN.md
• PRODUCT.md
• TECHNICAL.md
• docs/CHANGELOG.md
• docs/DATA_MODEL.md
• docs/DISPATCHER_GUIDE.md
• docs/DRIVER_GUIDE.md
• docs/OPERATIONS.md
• docs/PRODUCTION_READINESS_TEST_MATRIX.md
• docs/adr/0021-assignment-on-visibility-dispatch.md
• scripts/check-cron-heartbeats.mjs
• src/app/api/cron/stale-assignments/route.ts
• src/app/driver/AvailabilityToggle.tsx
• src/app/driver/WorkflowNoticeModal.tsx
• src/app/driver/actions.ts
• src/app/driver/page.tsx
• src/lib/domain/__tests__/driverLifecycleRelease.emulator.test.ts
• src/lib/domain/__tests__/driverWorkflowNotice.test.ts
• src/lib/domain/config.ts
• src/lib/domain/driverRegistry.ts
• src/lib/domain/driverWorkflowNotice.ts
• src/lib/domain/staleAssignments.ts
• src/lib/domain/types.ts
• src/lib/firebase/indexContract.ts
• src/lib/monitoring/cronHeartbeat.ts
• src/lib/utils/formatAuditEvent.ts
• vercel.json
• wiki-draft/Driver-Guide.md
• wiki-draft/System-Concepts.md

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