> 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/tasks.md).

# Task Checklist

**Session ID**: `phase27-session04-daily-time-series-persistence-and-sparklines` **Total Tasks**: 20 **Estimated Duration**: 3-4 hours **Created**: 2026-06-12

***

## Legend

* `[x]` = Completed
* `[ ]` = Pending
* `[P]` = Parallelizable (can run with other \[P] tasks)
* `[SNNMM]` = Session reference (NN=phase number, MM=session number)
* `TNNN` = Task ID

***

## Progress Summary

| Category       | Total  | Done   | Remaining |
| -------------- | ------ | ------ | --------- |
| Setup          | 2      | 2      | 0         |
| Foundation     | 5      | 5      | 0         |
| Implementation | 8      | 8      | 0         |
| Testing        | 5      | 5      | 0         |
| **Total**      | **20** | **20** | **0**     |

***

## Setup (2 tasks)

Initial configuration and environment preparation.

* [x] T001 \[S2704] \[P] Verify analyzer state, Sessions 01-03 completion, and Session 04 source stub before implementation (`.spec_system/PRD/phase_27/session_04_daily_time_series_persistence_and_sparklines.md`)
* [x] T002 \[S2704] \[P] Inspect snapshot, historical context, collector, schema, trend card, Workbench, and metric chip baselines before edits (`scripts/extensions/trend-finder/collector.ts`)

***

## Foundation (5 tasks)

Core structures and base implementations.

* [x] T003 \[S2704] \[P] Create private trend-series helpers for UTC day bucket normalization, 14-day zero fill, bounded counts, and Hugging Face download delta math (`scripts/lib/ai-runtime/trend-series.ts`)
* [x] T004 \[S2704] Extend snapshot schema and read/write compatibility for private daily topic counts and model download observations with path-confined writes and legacy snapshot defaults (`scripts/lib/ai-runtime/snapshots.ts`)
* [x] T005 \[S2704] Extend historical context assembly with per-topic sparkline and per-model download baseline lookup with missing-history and future-snapshot guards (`scripts/lib/ai-runtime/historical-context.ts`)
* [x] T006 \[S2704] Add browser schema fields for capped topic sparklines and Hugging Face download delta context with additive defaults, strict bounds, and legacy payload parsing (`src/extensions/trend-finder/schema.ts`)
* [x] T007 \[S2704] Add fixture coverage for daily series, missing history, Hugging Face model deltas, and first-seen no-baseline states (`src/extensions/trend-finder/fixtures.ts`)

***

## Implementation (8 tasks)

Main feature implementation.

* [x] T008 \[S2704] Build collector-side daily evidence count inputs from canonical topic IDs and evidence published timestamps with UTC edge handling and explicit invalid-date filtering (`scripts/extensions/trend-finder/collector.ts`)
* [x] T009 \[S2704] Attach capped sparkline arrays to topics before browser schema validation with deterministic ordering and empty-history states (`scripts/extensions/trend-finder/collector.ts`)
* [x] T010 \[S2704] Attach Hugging Face download deltas to evidence metric context with no-baseline state, negative-delta guard, and no private archive leakage (`scripts/extensions/trend-finder/collector.ts`)
* [x] T011 \[S2704] Extend Trend Finder view-model helpers for sparkline labels, SVG points, Workbench fields, and download delta chips with exhaustive fallback labels (`src/extensions/trend-finder/view-model.ts`)
* [x] T012 \[S2704] \[P] Create reusable sparkline SVG component with stable dimensions, empty state, aria labels, and no charting-library dependency (`src/extensions/trend-finder/components/trend-sparkline.tsx`)
* [x] T013 \[S2704] Render topic sparklines on trend cards with explicit unavailable copy, stable compact layout, and no metric card overflow (`src/extensions/trend-finder/components/trend-card.tsx`)
* [x] T014 \[S2704] Add Workbench sparkline row fields and sort/filter support with bounded pagination, validated filters, and deterministic ordering (`src/extensions/trend-finder/signal-workbench-model.ts`)
* [x] T015 \[S2704] Render Workbench sparkline column and evidence Hugging Face delta pills with fixed table sizing and accessible labels (`src/extensions/trend-finder/components/signal-workbench-table.tsx`)

***

## Testing (5 tasks)

Verification and quality assurance.

* [x] T016 \[S2704] \[P] Add trend-series tests for UTC bucket boundaries, zero-filled 14-day output, cap enforcement, download deltas, first-run no-baseline, and malformed dates (`scripts/lib/ai-runtime/__tests__/trend-series.test.ts`)
* [x] T017 \[S2704] \[P] Extend snapshot and historical-context tests for private persistence, legacy snapshots, bounded output, missing-history states, and path confinement (`scripts/lib/ai-runtime/__tests__/historical-context.test.ts`)
* [x] T018 \[S2704] \[P] Extend schema and dashboard view-model tests for additive defaults, sparkline parsing, delta chip labels, and payload bounds (`src/lib/__tests__/trend-finder-schema.test.ts`)
* [x] T019 \[S2704] \[P] Add component and Workbench tests for card sparklines, table column rendering, empty states, and accessible labels (`src/extensions/trend-finder/components/__tests__/trend-sparkline.test.tsx`)
* [x] T020 \[S2704] Run focused Trend Finder runtime tests, component tests, typechecks as feasible, payload budget check, and ASCII validation (`package.json`)

***

## Completion Checklist

Before marking session complete:

* [x] All tasks marked `[x]`
* [x] All tests passing
* [x] All files ASCII-encoded
* [x] implementation-notes.md updated
* [x] Ready for the validate workflow step

***

## Next Steps

Run the validate workflow step to verify session completeness.


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