id: BT-003B
title: Event Comparison Drilldown
status: done
priority: P1
effort: M
depends_on:
  - BT-003A
tags:
  - backtesting
  - ui
summary: The event comparison page now explains why one ranked strategy beat another by exposing a selectable drilldown over the ranked results.
completed_notes:
  - Added service-backed drilldown models in `app/services/event_comparison_ui.py` for ranked strategy selection, worst-LTV inspection, breach dates, and daily path rows.
  - Updated `app/pages/event_comparison.py` to render a `Strategy drilldown` selector, selected-strategy summary cards, worst-LTV and breach-date highlights, and a daily path details table.
  - Added regression coverage in `tests/test_event_comparison_ui.py` and extended `tests/test_e2e_playwright.py` so drilldown selection proves route-visible content changes.
  - Local Docker validation is now confirmed on Docker Desktop: the stack starts cleanly, `/health` returns OK, and browser automation on the Docker-served `/{workspace_id}/event-comparison` route verified the drilldown UI and selection updates.
  - The earlier Docker validation confusion was caused by a local SSH port-forward hijacking host requests to `localhost:8000`, not by the app container itself.