id: CORE-001D2D
title: Historical Provider Row Normalization Boundary
status: done
priority: P2
effort: S
depends_on:
  - CORE-001D2A
tags:
  - core
  - decimal
  - provider
  - backtesting
summary: Historical provider row and synthetic option quote normalization are now explicit boundary adapters with focused validation.
completed_notes:
  - Added explicit daily-close row normalization in `app/services/backtesting/historical_provider.py`.
  - Malformed row dates and non-finite close values are now rejected at the provider boundary instead of leaking into backtest paths.
  - Synthetic option quotes now validate required string and numeric fields on construction.
  - Added focused regression coverage in `tests/test_backtesting.py` for normalized rows and invalid quote payloads.
  - Validated with focused pytest coverage and `make build` on local Docker.