> For the complete documentation index, see [llms.txt](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://ai-os-and-trend-finder.gitbook.io/ai-os-and-trend-finder-docs/.spec_system/archive/sessions/phase27-session04-daily-time-series-persistence-and-sparklines/validation.md).

# Validation Report

**Session ID**: `phase27-session04-daily-time-series-persistence-and-sparklines` **Validated**: 2026-06-12 **Result**: PASS

***

## Validation Summary

| Check                     | Status | Notes                                                                                            |
| ------------------------- | ------ | ------------------------------------------------------------------------------------------------ |
| Tasks Complete            | PASS   | 20/20 tasks complete                                                                             |
| Files Exist               | PASS   | 18/18 declared deliverables found and non-empty                                                  |
| ASCII Encoding            | PASS   | No non-ASCII or CRLF found in modified/untracked files                                           |
| Tests Passing             | PASS   | 3362/3362 tests passed                                                                           |
| Database/Schema Alignment | N/A    | N/A - no DB-layer changes; snapshot JSON schema only                                             |
| Quality Gates             | PASS   | Typechecks, lint, build, bundle budget, targeted Prettier, and git diff whitespace checks passed |
| Conventions               | PASS   | Session code follows existing Trend Finder runtime, schema, view-model, and component patterns   |
| Security & GDPR           | PASS   | No findings; GDPR N/A                                                                            |
| Behavioral Quality        | PASS   | Runtime boundaries, failure states, stable UI sizing, and accessibility spot-check passed        |

**Overall**: PASS

***

## 1. Task Completion

### Status: PASS

| Category       | Required | Completed | Status |
| -------------- | -------- | --------- | ------ |
| Setup          | 2        | 2         | PASS   |
| Foundation     | 5        | 5         | PASS   |
| Implementation | 8        | 8         | PASS   |
| Testing        | 5        | 5         | PASS   |

### Incomplete Tasks

None.

***

## 2. Deliverables Verification

### Status: PASS

#### Files Created

| File                                                                        | Found | Status |
| --------------------------------------------------------------------------- | ----- | ------ |
| `scripts/lib/ai-runtime/trend-series.ts`                                    | Yes   | PASS   |
| `scripts/lib/ai-runtime/__tests__/trend-series.test.ts`                     | Yes   | PASS   |
| `src/extensions/trend-finder/components/trend-sparkline.tsx`                | Yes   | PASS   |
| `src/extensions/trend-finder/components/__tests__/trend-sparkline.test.tsx` | Yes   | PASS   |

#### Files Modified

| File                                                                   | Found | Status |
| ---------------------------------------------------------------------- | ----- | ------ |
| `scripts/lib/ai-runtime/snapshots.ts`                                  | Yes   | PASS   |
| `scripts/lib/ai-runtime/historical-context.ts`                         | Yes   | PASS   |
| `scripts/extensions/trend-finder/collector.ts`                         | Yes   | PASS   |
| `src/extensions/trend-finder/schema.ts`                                | Yes   | PASS   |
| `src/extensions/trend-finder/view-model.ts`                            | Yes   | PASS   |
| `src/extensions/trend-finder/components/trend-card.tsx`                | Yes   | PASS   |
| `src/extensions/trend-finder/signal-workbench-model.ts`                | Yes   | PASS   |
| `src/extensions/trend-finder/components/signal-workbench-table.tsx`    | Yes   | PASS   |
| `src/extensions/trend-finder/fixtures.ts`                              | Yes   | PASS   |
| `scripts/lib/ai-runtime/__tests__/snapshots.test.ts`                   | Yes   | PASS   |
| `scripts/lib/ai-runtime/__tests__/historical-context.test.ts`          | Yes   | PASS   |
| `src/lib/__tests__/trend-finder-schema.test.ts`                        | Yes   | PASS   |
| `src/lib/__tests__/trend-finder-dashboard.test.tsx`                    | Yes   | PASS   |
| `src/extensions/trend-finder/__tests__/signal-workbench-model.test.ts` | Yes   | PASS   |

### Missing Deliverables

None.

***

## 3. ASCII Encoding Check

### Status: PASS

| File Set                 | Encoding | Line Endings | Status |
| ------------------------ | -------- | ------------ | ------ |
| Declared deliverables    | ASCII    | LF           | PASS   |
| Modified/untracked files | ASCII    | LF           | PASS   |

### Encoding Issues

None.

***

## 4. Test Results

### Status: PASS

| Metric      | Value   |
| ----------- | ------- |
| Total Tests | 3362    |
| Passed      | 3362    |
| Failed      | 0       |
| Coverage    | Not run |

### Commands

* `bun run typecheck` - PASS
* `bun run typecheck:scripts` - PASS
* `bun run test` - PASS, 271 files and 3362 tests
* `bun run lint` - PASS with 3 existing warnings outside session deliverables
* `bun run build` - PASS
* `bun run budget:check` - PASS, 0 violations
* `bunx prettier --check [session deliverables + validation-time test fix]` - PASS
* `git diff --check` - PASS

### Failed Tests

None after fixes.

### Fixes Applied During Validation

* Updated `src/extensions/trend-finder/__tests__/visibility-views.test.tsx` to derive source counts from `FIXTURE_TREND_FINDER_DATA.sources.length` after the session added a Hugging Face Models fixture source.
* Added `role="img"` to `src/extensions/trend-finder/components/trend-sparkline.tsx` so the sparkline aria label has explicit image semantics.
* Applied Prettier to affected session files after lint reported formatting errors.

***

## 5. Database/Schema Alignment

### Status: N/A

*N/A because the session introduced no DB-layer changes.*

* [x] No migration or persisted database schema required.
* [x] Snapshot JSON schema changes are versioned in code and covered by tests.
* [x] Legacy snapshot defaults were verified.

### Issues Found

N/A - no DB-layer changes.

***

## 6. Success Criteria

From `spec.md`:

### Functional Requirements

* [x] Topic sparkline arrays are capped at 14 UTC day buckets and parse through the browser schema.
* [x] Topics with missing history render explicit unavailable or empty states.
* [x] Day bucketing is deterministic across timezone edges and invalid timestamps are not guessed.
* [x] Hugging Face download deltas appear only when a prior finite download count exists for the same public model entity.
* [x] First-seen Hugging Face models show no-baseline context rather than a numeric delta.
* [x] Private snapshot archives and paths do not appear in browser payload, UI, static export projections, or logs.
* [x] Trend cards and Signal Workbench render sparklines without layout overflow on dense dashboard surfaces.

### Testing Requirements

* [x] Unit tests cover bucket math, bounds, zero-fill, malformed dates, and download delta states.
* [x] Snapshot and historical-context tests cover legacy snapshots, path confinement, missing archives, and bounded output.
* [x] Schema and view-model tests cover additive defaults and browser-safe labels.
* [x] Component tests cover card/Workbench sparkline empty states and accessible labels.
* [x] Focused and full Trend Finder relevant test suites run successfully.

### Quality Gates

* [x] All files ASCII-encoded.
* [x] Unix LF line endings.
* [x] Code follows project conventions.
* [x] TypeScript app and script typechecks pass.
* [x] Relevant and full Vitest suites pass.
* [x] Production build and bundle budget pass.

***

## 7. Conventions Compliance

### Status: PASS

| Category       | Status | Notes                                                                                                         |
| -------------- | ------ | ------------------------------------------------------------------------------------------------------------- |
| Naming         | PASS   | New helpers use descriptive Trend Finder and snapshot naming.                                                 |
| File Structure | PASS   | Runtime helpers, tests, schema, view models, and components follow existing locations.                        |
| Error Handling | PASS   | Invalid timestamps, malformed metrics, missing baselines, and path issues become explicit states or warnings. |
| Comments       | PASS   | No noisy comments or commented-out code found.                                                                |
| Testing        | PASS   | Tests stay close to behavior and cover runtime, schema, view-model, component, and Workbench paths.           |

### Convention Violations

None in session deliverables. ESLint still reports three existing warnings outside this session's files, but exits with status 0.

***

## 8. Security & GDPR Compliance

### Status: PASS

**Full report**: See `security-compliance.md` in this session directory.

#### Summary

| Area     | Status | Findings |
| -------- | ------ | -------- |
| Security | PASS   | 0 issues |
| GDPR     | N/A    | 0 issues |

### Critical Violations

None.

***

## 9. Behavioral Quality Spot-Check

### Status: PASS

**Checklist applied**: Yes **Files spot-checked**:

* `scripts/lib/ai-runtime/trend-series.ts`
* `scripts/lib/ai-runtime/snapshots.ts`
* `scripts/lib/ai-runtime/historical-context.ts`
* `scripts/extensions/trend-finder/collector.ts`
* `src/extensions/trend-finder/components/trend-sparkline.tsx`

| Category           | Status | File                                                         | Details                                                                                 |
| ------------------ | ------ | ------------------------------------------------------------ | --------------------------------------------------------------------------------------- |
| Trust boundaries   | PASS   | `src/extensions/trend-finder/schema.ts`                      | Browser data is bounded by strict additive schemas.                                     |
| Resource cleanup   | PASS   | `src/extensions/trend-finder/components/trend-sparkline.tsx` | Stateless render component; no acquired resources.                                      |
| Mutation safety    | PASS   | `scripts/lib/ai-runtime/snapshots.ts`                        | Snapshot writes remain path-confined and atomic.                                        |
| Failure paths      | PASS   | `scripts/extensions/trend-finder/collector.ts`               | Invalid dates and missing or malformed metrics become explicit warnings or states.      |
| Contract alignment | PASS   | `scripts/lib/ai-runtime/historical-context.ts`               | Historical series and model baselines align with snapshot and browser schema contracts. |

### Violations Found

None.

### Fixes Applied During Validation

* Source visibility tests now track fixture source counts dynamically.
* Sparkline component now uses `role="img"` for explicit accessible image semantics.
* Prettier formatting applied to affected session files.

## Validation Result

### PASS

Session 04 is validated. All declared tasks and deliverables are complete, all required tests and quality gates pass, and the security/GDPR review has no blocking findings.

### Required Actions

None.

## Next Steps

Run `updateprd` to mark the session complete.


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