> 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/phase15-session02-live-data-merge-boundary/implementation_summary.md).

# Implementation Summary

**Session ID**: `phase15-session02-live-data-merge-boundary` **Completed**: 2026-05-31 **Duration**: 0.3 hours

***

## Overview

Implemented the live-data merge boundary for Phase 15 so scoped scheduler jobs can preserve owned branches, share a generated-data write lock, and fall back to the committed example base when current live data is invalid or missing.

***

## Deliverables

### Files Created

| File                                                                                      | Purpose                          | Lines |
| ----------------------------------------------------------------------------------------- | -------------------------------- | ----- |
| `.spec_system/specs/phase15-session02-live-data-merge-boundary/validation.md`             | Session validation record        | \~18  |
| `.spec_system/specs/phase15-session02-live-data-merge-boundary/IMPLEMENTATION_SUMMARY.md` | Completion summary for updateprd | \~60  |

### Files Modified

| File                                                                                    | Changes                                                                                                  |
| --------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------- |
| `scripts/lib/aggregate-live-data-write.ts`                                              | Finalized scoped merge behavior, fallback loading, privacy rejection, and shared generated-data locking. |
| `scripts/lib/__tests__/aggregate-live-data-write.test.ts`                               | Strengthened branch preservation, fallback, privacy, and lock cleanup coverage.                          |
| `scripts/lib/scheduler/locks.ts`                                                        | Confirmed generated-data locking reuses scheduler stale-recovery semantics.                              |
| `scripts/aggregate.ts`                                                                  | Routed full aggregate output through the producer gate.                                                  |
| `docs/runbooks/scheduled-aggregate.md`                                                  | Documented ownership, lock, fallback, and privacy boundaries.                                            |
| `.spec_system/specs/phase15-session02-live-data-merge-boundary/spec.md`                 | Marked the session completed.                                                                            |
| `.spec_system/specs/phase15-session02-live-data-merge-boundary/tasks.md`                | Recorded all tasks complete.                                                                             |
| `.spec_system/specs/phase15-session02-live-data-merge-boundary/implementation-notes.md` | Logged implementation progress and verification.                                                         |
| `.spec_system/PRD/phase_15/PRD_phase_15.md`                                             | Updated phase progress and session tracker.                                                              |
| `.spec_system/state.json`                                                               | Marked the session complete and cleared the active session.                                              |
| `package.json`                                                                          | Bumped the patch version.                                                                                |
| `README.md`                                                                             | Updated the visible version line.                                                                        |

***

## Technical Decisions

1. **Shared generated-data lock**: Reused scheduler lock semantics so scoped jobs can serialize writes without introducing a separate locking model.
2. **Validated merge fallback**: Kept the committed example live-data file as the fallback merge base so scoped writes remain safe when current data is invalid or absent.

***

## Test Results

| Metric   | Value |
| -------- | ----- |
| Tests    | 28    |
| Passed   | 28    |
| Coverage | N/A   |

***

## Lessons Learned

1. The producer gate needs to own both full writes and scoped writes to avoid split-path drift.
2. Safe error surfaces are easier to maintain when invalid-base reporting uses statuses instead of raw file contents or private paths.

***

## Future Considerations

Items for future sessions:

1. Keep orchestration extraction isolated from the live-data write boundary.
2. Preserve the generated-data lock boundary when scoped scheduler jobs are introduced.

***

## Session Statistics

* **Tasks**: 16 completed
* **Files Created**: 2
* **Files Modified**: 12
* **Tests Added**: 0
* **Blockers**: 0 resolved


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