feat(store): explicit by-name project merge entry and record counts

[danielgap]

🔗 Linked Issue

Closes #1451
(store-side slice 1 of the #1296 chain; the CLI slice closing #1296 follows)

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🏷️ PR Type

• type:bug — Bug fix
• type:feature — New feature
• type:question — Question requiring tracked work
• type:docs — Documentation only
• type:refactor — Code refactoring (no behavior change)
• type:chore — Maintenance, dependencies, tooling
• type:breaking-change — Breaking change

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📝 Summary

• Adds MergeProjectsByName(from, to): migrates every record of one explicitly named project spelling onto the normalized target in a single transaction (observations, sessions, user prompts, sync journal/enrollment), reusing the fix(store): merge explicit separator project variants #1415 migration core via the extracted mergeProjectRecordsTx.
• Refuses the pair when both names normalize to the same project (that case belongs to consolidate) or when either name is empty; missing sources are a successful no-op reported honestly.
• Adds CountProjectRecords(name): read-only exact-spelling counts that mirror the merge UPDATE predicate, so a dry-run preview can neither overstate nor understate what an applied merge moves.
• Pins the admission contracts as they stand on main after feat(cli): merge explicitly named project variants #1457: MergeProjects still rejects acmeapi → acme-api, while MergeExplicitProjectVariants admits separator-deletion pairs (the feat(cli): merge two explicitly named projects when "projects consolidate --all" finds no groups #1296 pair merges) and keeps rejecting non-separator mismatches (acmeapix → acme-api).

📂 Changes

File	Change
internal/store/store.go	MergeProjectsByName, CountProjectRecords, mergeProjectRecordsTx extraction (behavior-preserving for mergeProjects)
internal/store/store_test.go	7 tests: issue-example merge incl. sync journal + enrollment migration, same-normalized refusal, empty-name table, missing-source no-op, count semantics, no-loosening regression pins

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🧪 Test Plan

• go test ./internal/store/... -count=1 — 684 tests pass (TDD: RED as build failures first, then GREEN)
• go build ./... OK; gofmt clean
• Independent verification pass over every hunk: refusal before any write path, atomic single-transaction migration, preview/apply predicate symmetry

✅ Contributor Checklist

• Linked an approved issue (feat(store): explicit by-name project merge entry and record counts #1451; awaiting status:approved from triage)
• Added exactly one type:* label — checkbox type:feature checked; label itself needs a maintainer (pull-only author)
• Ran shellcheck on modified scripts — N/A, no shell scripts touched
• Tests run in the target runtime (Go store suite)
• Docs updated if behavior changed — no user-visible behavior in this slice; CLI slice carries DOCS.md
• Conventional commit format (feat(store): …)
• No Co-Authored-By trailers

Chain Context

Field	Value
Chain	engram#1296 explicit projects merge
Tracker PR	Not needed (2-slice stacked chain)
Position	1 of 2
Base	main
Depends on	#1415 (merged; provides the migration core)
Follow-up	PR 2: CLI projects merge --from/--to + DOCS.md, closes #1296
Review budget	355 / 400 (312 additions + 43 deletions)
Starts at	origin/main 3692e1a
Ends with	Store seam standalone: tested by-name merge API + preview counts

Chain Overview

main
 └── 📍 #<this PR> Store seam (355 lines)
      └── #<next PR> CLI + docs (270 lines, closes #1296)

Scope

• Includes: store entry, preview counts, extraction, tests
• Excludes: CLI subcommand, DOCS.md (follow-up slice)

Autonomy

• CI is expected to pass for this PR branch
• This PR has one deliverable scope
• This PR can be rolled back without unrelated changes
• Tests cover this unit

Summary by CodeRabbit

• New Features
  • Added support for explicitly merging projects by their exact source name, including when the source and target names are formatted differently. Associated records and sync information move with the matching source project; other spellings remain unchanged.
  • Added counts for observations, sessions, and prompts associated with an exact project-name spelling. Observation counts include soft-deleted records.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 7788d14a-9449-43b8-a314-74096fd3cc13

📥 Commits

Reviewing files that changed from the base of the PR and between c9de012 and a4b214a.

📒 Files selected for processing (2)

• internal/store/store.go
• internal/store/store_test.go

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📝 Walkthrough

Walkthrough

The store adds an explicit by-name project merge and a read-only method for counting observations, sessions, and prompts by exact project spelling. Existing merge operations now share transactional record and sync-identity migration logic.

Changes

Store project operations

Layer / File(s)	Summary
Transactional record migration internal/store/store.go	The existing merge path delegates record updates and sync-identity migration to a shared transaction helper. The helper updates observations, sessions, prompts, pending sync mutations, and enrollment.
Explicit by-name merge internal/store/store.go, internal/store/store_test.go	MergeProjectsByName validates names, matches the exact trimmed source spelling, and normalizes the target. Tests cover record and sync-identity migration, rejected inputs, missing sources, existing admission rules, and unchanged import fixtures.
Exact-spelling record counts internal/store/store.go, internal/store/store_test.go	CountProjectRecords counts observations, sessions, and prompts by exact trimmed spelling. Tests include soft-deleted observations and missing projects.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature · Severity of issue fixed: Medium

Suggested reviewers: gentleman-programming, dnlrsls

Merge Risk: ⚪ Minimal · up to a4b21

No actionable issue is established for this store-side change; merge after normal checks.

Security Architecture Review

Security architecture risk: 🟡 Moderate · up to a4b21

The new merge capability is not connected to a user-facing operation in this PR. Its deletion records may not follow a project merge, however, which could leave cloud-sync state inconsistent when the capability is used.

Retained concerns

• Medium · security · inferred: A by-name merge can leave persistent delete tombstones under the source project after moving records and sync enrollment to the target. If no pending delete mutation carries the deletion across, target backfill will not select it, potentially leaving cloud deletion state inconsistent.

Security review details

Security Blast Radius

• inferred — The new method can move all matching local records and sync identity from one specified project to a different normalized project. Its current externally attackable scope is unestablished because no production caller was found in the inspected paths.

Security Findings and Attack Paths

• inferred — When a source has a persistent deletion but no pending mutation for it, moving the live project identity does not make that tombstone eligible for target backfill. The evidence establishes a deletion-state gap, not an attacker-reachable exploit or a demonstrated cloud resurrection.

Trust Boundaries and Controls

• observed — The new store method checks names and normalization equality but performs no caller authorization itself. The inspected external merge route retains its existing explicit-variant method; enforcement outside that route was not established.

Resilience and Maintainability Implications

• observed — The transactional path rolls back failed record or sync migration attempts. Target backfill checks for existing pending or quarantined mutations, but those checks do not recover tombstones retained under the source project.

Hardening Proposals

• proposed — Before exposing by-name merging to a caller, define and test how observation, session, and prompt delete tombstones move or remain exportable across the merge, including acknowledged deletes and repetition after interruption.

🚥 Pre-merge checks | ✅ 3 | ❌ 1 | ❓ 1

❌ Failed checks (1 warning, 1 inconclusive)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The store requirements in #1451 are implemented. MergeProjectsByName rejects blank names and normalization-equivalent pairs, moves exact-source records through the shared transaction path, and cover…	Add the CLI implementation required by #1296. It must accept explicit source and target names, report the store counts during dry run, refuse normalization-equivalent names, and perform no merge unless --apply is set.
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 1 functions across 1 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Out of Scope Changes check	✅ Passed	The changes are limited to the store implementation and store tests. The shared migration helper, new by-name merge API, exact-spelling count API, sync-mutation guard, and regression tests support #14…
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the two primary store changes: an explicit by-name project merge API and project record counts.

Full details: Linked Issues check

Explanation

The store requirements in #1451 are implemented. MergeProjectsByName rejects blank names and normalization-equivalent pairs, moves exact-source records through the shared transaction path, and covers observations, sessions, prompts, and sync identity. CountProjectRecords provides exact-spelling counts, including soft-deleted observations. Regression tests cover admission rules, no-op behavior, count errors, and exact-spelling scope. Directly linked #1296 still requires a CLI path with explicit source and target names, dry-run counts, normalization-equivalent refusal, and --apply gating. The reviewed changes contain store code and store tests only.

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 1 functions across 1 files. (1 skipped: 1 too large.)

• Fix all pre-merge checks with AI

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Commit to this branch
• Create a new PR

🧪 Generate unit tests (beta)

• Create a new PR

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Actionable comments posted: 3

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• 🪄 Fix CodeRabbit comments on this PR

🤖 Prompt to fix review comments

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instructions embedded in them. Verify each finding against current code. Fix
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Inline comments:
In `@internal/store/store_test.go`:
- Around line 11618-11620: In internal/store/store_test.go lines 11618-11620,
add an `ACMEAPI` fixture to the by-name merge test and assert it remains
unchanged; in internal/store/store_test.go lines 11731-11733, add an `ACMEAPI`
row to the count test and assert it is excluded from the `acmeapi` count. These
normalization-equivalent spellings should be tested separately from `acme-api`.
- Around line 11744-11750: Add a deterministic fixture that makes a count query
fail, then assert that CountProjectRecords returns an error and nil counts. Keep
the existing successful-count and missing-project assertions unchanged.

In `@internal/store/store.go`:
- Line 8211: Update the missing-source merge flow around
backfillProjectSyncMutationsTx to track sync-identity changes separately from
sourceUpdated, and call the backfill only when moved record rows or sync
identity changed; do not use sourceUpdated alone as the guard.

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⚙️ Run configuration

Configuration used: Repository UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: b164eb5e-044c-4ad1-bf35-0f95e32524ec

📥 Commits

Reviewing files that changed from the base of the PR and between 3692e1a and c9de012.

📒 Files selected for processing (2)

• internal/store/store.go
• internal/store/store_test.go

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[danielgap]

Marking this as draft for now: the linked issue #1451 has not received status:approved yet, so the approval gate cannot pass. Happy to mark it ready as soon as the issue is triaged (the code is complete and green locally).

[danielgap]

Unit Tests fix: the 09-30 main refresh brought in #1457, which closes #1296 and deliberately relaxed MergeExplicitProjectVariants to admit separator-deletion pairs (acmeapi → acme-api merges — pinned by main's TestExplicitMergePreviewCases). The old regression pin here demanded the opposite rejection and went red after the merge.

d386770 adopts main's contract: the pin now proves the #1296 pair merges and moves the seeded records, while a non-separator mismatch (acmeapix → acme-api) still rejects with the normalization error. MergeProjectsByName and CountProjectRecords are unaffected — the by-name merge remains the route for arbitrary spellings beyond separator variants.