Mike Bridge 52a3ab0d71 test(activity-view): add T045 perf-validation tests ...

Two opt-in tests (SUPERSET_PERF_VALIDATION=1 to run, skipped otherwise)
under the existing PerfValidationTests class:

* test_av_sc001_activity_endpoint_p95_under_1500ms — seeds dense
  history on the birth_names dashboard (~12 chart edits, 5 dataset
  edits, 1 dashboard edit), then hits /api/v1/dashboard/<uuid>/activity/
  50 times after warmup and asserts p95 < 1500ms per SC-AV-001.

* test_av_sc003_save_path_p95_unaffected_by_activity_view — under the
  same fixture, runs 50 dashboard saves and re-measures the SC-004
  version-capture overhead (50ms p95 budget). Confirms the activity-
  view branch hasn't added a new save-path coupling that regresses
  sc-103156's save-path budget. PASSES on the current branch — read-
  only feature, no new save-path code paths.

Seed fixture differs from the spec's "25 charts × 3 dataset windows
each" target — the birth_names fixture has ~12 charts on a single
dataset, so we approximate by editing many charts plus the dataset
multiple times. A bespoke multi-dataset fixture would let us measure
against the spec's exact scale; that's future work.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-05-28 15:37:25 -06:00

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