refactor(BT-001C): share historical fixture provider

docs/roadmap/ROADMAP.yaml

@@ -13,7 +13,6 @@ notes:
   - Pre-alpha policy: we may cut or replace old features without backward compatibility until alpha is declared.
   - Alpha migration policy: once alpha is declared, compatibility only needs to move forward; backward migrations are not required.
 priority_queue:
-  - BT-001C
   - EXEC-001
   - EXEC-002
   - DATA-002A
@@ -22,6 +21,7 @@ priority_queue:
   - BT-003
   - BT-002A
 recently_completed:
+  - BT-001C
   - BT-002
   - PORT-003
   - BT-003B
@@ -45,7 +45,6 @@ states:
     - EXEC-001
     - EXEC-002
     - BT-003
-    - BT-001C
     - BT-002A
   in_progress: []
   done:
@@ -62,6 +61,7 @@ states:
     - EXEC-001A
     - BT-001
     - BT-001A
+    - BT-001C
     - BT-002
     - BT-003A
     - BT-003B

docs/roadmap/backlog/BT-001C-shared-historical-fixture-provider.yaml

@@ -1,14 +0,0 @@
-id: BT-001C
-title: Shared Historical Fixture/Test Provider Cleanup
-status: backlog
-priority: P2
-effort: S
-depends_on:
-  - BT-001A
-  - BT-003A
-tags: [backtesting, test-infra]
-summary: Centralize deterministic historical fixture logic used by browser-tested backtest UIs.
-acceptance_criteria:
-  - Deterministic historical fixture/provider logic is centralized.
-  - Supported seeded windows are explicit and fail closed outside allowed ranges.
-  - Both /backtests and /event-comparison use the shared deterministic provider.

docs/roadmap/done/BT-001C-shared-historical-fixture-provider.yaml

@@ -0,0 +1,18 @@
+id: BT-001C
+title: Shared Historical Fixture/Test Provider Cleanup
+status: done
+priority: P2
+effort: S
+depends_on:
+  - BT-001A
+  - BT-003A
+tags:
+  - backtesting
+  - test-infra
+summary: Deterministic historical fixture logic for browser-tested backtest UIs is now centralized behind a shared fixture source used by both `/backtests` and `/event-comparison`.
+completed_notes:
+  - Added `app/services/backtesting/fixture_source.py` with shared seeded GLD fixture history and explicit exact-vs-bounded window policies.
+  - Updated `app/services/backtesting/ui_service.py` so the `/backtests` page uses the shared fixture source in exact-window mode and still fails closed outside the seeded BT-001A range.
+  - Updated `app/services/event_comparison_ui.py` so the `/event-comparison` page uses the same shared fixture source in bounded-window mode for preset subranges inside the seeded BT-003A fixture window.
+  - Added focused regression coverage in `tests/test_backtesting_fixture_source.py` proving the shared source enforces exact and bounded policies explicitly and that both page services use the centralized fixture source.
+  - During this implementation loop, local Docker validation stayed green on the affected historical routes: `/health` returned OK and `tests/test_e2e_playwright.py` passed against the Docker-served app.