fix(store): prevent deleted inbox prompt replay across restore

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🔗 Linked Issue

Closes #1458 only after children integrate in order through draft/no-merge tracker #1464. Do not merge this child directly to main.

Current CodeRabbit follow-up (F3 f936e020)

• Addressed imported tombstone session gap r4114464126 in 7ae13f9c (code/test) and 3f7e24f9 (docs): import rejects an inbox-ID tombstone without a nonblank session before side effects; legacy no-ID tombstones remain valid. The regression was RED before and GREEN afterward.
• Addressed conflicting pulled-delete identity r4114579165 in f936e020: a delete of a live prompt records its actual session and inbox ID rather than conflicting nonempty payload identity; an absent row retains the payload. Regression observed wrong tombstone pair before correction, asserts the live pair and replay rejection afterward. Updated architecture contract.
• Independent focused/affected checks, full CODEX_HOME='' go test ./... -count=1, diff-scoped lint (0 issues), and diff check passed locally. Native review-63f1d955ba180707 approved/acknowledged. Earlier F1/F2 corrections remain in normal-merge ancestry.
• Final F3-only slice vs tracker after F2 normal merge (same F2 tree as sync-r4): 667 / 400 lines (626 additions, 41 deletions), with explicit user authorization extending the F3-only exception from 639 to 667. Fork head was fast-forwarded without rewrite; fresh CI passed on this exact head (unit, lint, E2E, plugin, Windows setup/cloud wrapper, and PR policy jobs), and CodeRabbit reported “Full review finished” with a “Review completed” status on this head and no new inline finding. A green Review skipped is not substantive. Do not merge this child directly to main.

🏷️ PR Type

• type:feature (final foundation slice)
• size:exception (explicitly accepted extension to address critical review finding)

📝 Summary

• Retain admitted inbox identity in durable prompt deletion tombstones across local/pulled delete, enrollment/backfill, export and restore.
• Reject reuse of a deleted (session_id, source_inbox_id) after deletion, sync or backup restoration. HTTP returns 409 without ID or write notification; no-ID legacy requests still append.
• On repeated sparse pulled deletes, preserve the tombstone's session, inbox ID and project scope. A regression reproduces project-scoped export omission after session removal, then proves export/import and stale replay rejection.

📂 Changes

File	Change
internal/store/store.go, internal/store/store_test.go	Tombstone persistence/replay guard, sync and backup cases, repeat-delete identity and project-scoped export/import regressions
internal/server/server.go, internal/server/server_test.go	HTTP 409 without notification and coverage
docs/ARCHITECTURE.md	Deletion replay contract

🧪 Test Plan

• Before fix: go test ./internal/store -run '^TestPromptInboxIdentityDeletedPulledAgainWithoutSession$' -count=1 — failed as expected: tombstone session was empty, inbox was one.
• After fix: go test ./internal/store -run '^TestPromptInboxIdentityDeleted' -count=1 — passed.
• go test ./internal/server -run '^(TestPromptInboxDeletedReplayHTTP|TestPromptInboxIdentityHTTP)$' -count=1 — passed.
• go test ./internal/store -run '^TestPromptSparseDeleteRetainsProjectAfterSessionRemoval$' -count=1 — RED before fix: project export lost scoped tombstone: []; GREEN after fix, including import and stale replay rejection.
• go test ./internal/store ./internal/server -count=1 — passed independently on corrected F3 b56ed3ab (both packages).
• git diff --check 43504774 HEAD — passed, clean worktree.
• Native exact integrated F3 review review-6780af7bd5d56946 identified candidate-caused CRITICAL R3-001. A bounded 33-diff-line plan and targeted validator approved the corrected head e73173b1; review acknowledged. Prior source/integration approvals do not substitute for this corrected candidate.
• Native correction-commit review review-1b460fe3a46113ba approved/acknowledged on b56ed3ab against merge parent ebf3509b.
• Fresh GitHub CI on corrected F3 head b56ed3ab: all required checks, Unit, E2E, Plugin, Lint and applicable Windows checks passed; Performance Ratchet skipped; CodeRabbit finished successfully (automated review skipped).

🤖 Automated Checks

Fresh CI passed on corrected F3 head b56ed3ab; human GitHub approval remains pending.

✅ Contributor Checklist

• Approved feat(store): preserve admitted prompt identity through sync and deletion #1458, one type:* label and explicit size:exception
• Tests/docs, no transient artifacts, conventional commits without Co-Authored-By trailers
• Exact review correction validated natively and locally

💬 Notes for Reviewers

Current F3-only size exception: 667 / 400 changed lines (626 additions + 41 deletions), explicitly authorized for the latest CodeRabbit follow-up. The prior 502-line version was separately authorized. The first repeated-delete correction was e73173b1; the scoped export/restore regression and project-preserving SQL fix are the additional 43-line work unit b56ed3ab (42 insertions, 1 deletion). No cosmetic compression or omitted tests: tombstones, sync, project-scoped backup and HTTP replay rejection form one cohesive deletion invariant.

F1 CodeRabbit test-only correction was brought into F2 7ab5aa35 by normal merge, then F2 into F3 2bcec0c1. The reviewed F2 follow-up 43504774 was propagated by normal merge ebf3509b, followed by F3 correction b56ed3ab; no history rewrite. Protected upstream branches cannot be directly updated (GH013), so the user authorized new snapshot bases. The old upstream references remain untouched. No branch-protection bypass or PR merge.

Chain Context

Field	Value
Tracker	#1464 (draft, no merge)
Position	3 of 3 📍
Base	feat/prompt-inbox-foundation-tracker after F2 merge a5f44106 (F2 tree 0850928b)
Parents	F1 #1465 → F2 #1466
Review budget	667 / 400, F3-only size:exception explicitly extended
Starts at	Corrected F2 43504774
Ends with	No-resurrection prompt identity foundation

main → #1464 draft → #1465 F1 → #1466 F2 → 📍 #1469 F3

Autonomy

• Fresh CI passes on corrected PR head b56ed3ab
• Tests/docs and rollback boundary: revert F3 correction only to remove repeated-delete fix, or revert F3 unit to remove deletion protection
• Human review and ordered integration (pending; no automatic merge)

Summary by CodeRabbit

• Bug Fixes

  • Resubmitting a deleted prompt with the same inbox identity returns a conflict without creating a prompt or triggering a write notification, including after synchronization or backup restore.
  • Backup imports reject deletion records with an inbox identity but no session identity.

• Improvements

  • Deletion records retain inbox identity through synchronization and backup export and restore, preserving deletion behavior across devices and backups.
  • Prompts with a different inbox identity can still be added after the original prompt is deleted.

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ℹ️ Recent review info

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📥 Commits

Reviewing files that changed from the base of the PR and between 0850928 and f936e02.

📒 Files selected for processing (5)

• docs/ARCHITECTURE.md
• internal/server/server.go
• internal/server/server_test.go
• internal/store/store.go
• internal/store/store_test.go

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📝 Walkthrough

Walkthrough

Prompt tombstones now retain inbox identity through deletion, sync, backup, and restore. The store rejects replay of a deleted session-and-inbox identity, and the HTTP endpoint returns 409 for that conflict.

Changes

Prompt tombstone identity

Layer / File(s)	Summary
Record and enforce deleted prompt identities internal/store/store.go, internal/store/store_test.go	The store records inbox identity in prompt tombstones and rejects adding a prompt with the same deleted session-and-inbox identity. Tests cover local and pulled deletions, session removal, and replay.
Carry tombstones through sync and backups internal/store/store.go, internal/store/store_test.go	Backup and sync paths transfer tombstones with inbox identity. Imports apply tombstones before prompts, and pulled upserts check deleted identities. Tests cover export/import, enrollment backfill, and legacy backups.
Return conflict for deleted identity replays internal/server/server.go, internal/server/server_test.go, docs/ARCHITECTURE.md	The prompt endpoint returns HTTP 409 for the deleted-identity error. HTTP tests and architecture documentation describe replay behavior.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Bug fix · Severity of issue fixed: Medium

Suggested reviewers: alan-thegentleman

Merge Risk: ⚪ Minimal · up to f936e

No actionable defect is established in this change. Complete the planned human review and ordered integration before merging it to main.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to f936e

A restore can now permanently delete matching prompts and prevent their replay. Restore access was already powerful and the server binds to loopback, but imported deletion markers are not checked against project ownership.

Retained concerns

• Medium · security · observed: An imported tombstone can delete a local prompt matching its supplied sync ID or session/inbox identity and propagate that deletion, without checking whether the supplied project owns the target. The impact depends on who can submit or influence a restore.

Security review details

Security Blast Radius

• inferred — A caller able to submit a restore can target matching prompts across projects in the same store; enrolled projects can inherit resulting delete mutations. The available evidence does not establish that mutually untrusted users share that restore access.

Security Findings and Attack Paths

• observed — Restore accepts a supplied tombstone identity, finds local prompts by sync ID or session/inbox pair, deletes matches, and records replay-blocking tombstones. No project-ownership check appears in that deletion path.

Trust Boundaries and Controls

• observed — Import is an existing bulk-mutation endpoint guarded by a global optional token, while the listener binds to loopback. Local deletion reads the target row’s identity rather than trusting a supplied inbox ID.

Resilience and Maintainability Implications

• observed — Pulled deletes prefer a live row’s session/inbox identity; repeated tombstone writes preserve an existing inbox ID when the incoming value is absent.

Hardening Proposals

• proposed — If restores may contain data from a less-trusted source, establish that an imported deletion identity is authorized for the target session and project before deleting local prompts or propagating a delete.

🚥 Pre-merge checks | ✅ 4 | ❓ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Docstring Coverage	❓ Inconclusive	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. (2 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR meets the coding requirements in #1458. The store retains SourceInboxID in tombstones, sync payloads, backups, exports, imports, deletions, and backfill. Local and pulled replays of a deleted…
Out of Scope Changes check	✅ Passed	The changes remain within #1458. Store lifecycle changes, sync and backup handling, HTTP error mapping, regression tests, and architecture documentation directly support prompt identity retention and …
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the main change: preventing replay of deleted inbox prompts after restore. It is concise and specific.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 5 functions across 3 files. (2 skipped: 1 unsupported, 1 too large.)

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Inline comments:
In @internal/store/store.go:
- Around line 5910-5917: Update Store.Import’s prompt-tombstone handling so each
removed user_prompts row also queues a cloud-sync delete mutation or supersedes
its pending upsert; do not rely on ExportLocalDeleteTombstones, since cloud
export reads the pending mutation journal.

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The F3 head is now 72f84ccb on corrected F2 snapshot sync-r3. Please review imported prompt tombstone journaling against the previously reported cloud-delete finding; the automatic check may be skipped for this base branch, so green CI alone does not establish substantive review.

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Inline comments:
In @internal/store/store.go:
- Around line 5911-5914: Update the tombstone validation in the import loop to
reject entries with a non-empty SourceInboxID and a blank SessionID, using the
existing import error style. Preserve the current SyncID validation and accept
tombstones without a SourceInboxID.

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
In @internal/store/store.go:
- Around line 11239-11249: Update applyPromptDeleteTx to always use the live
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