finance.position (171 rows, 2020-06-07 to 2025-12-19) is the only source
of InvestEngine + Schwab trade history pre-dating the broker-sync project.
This provider reads it once and pushes every row into the correct WF
account (.L tickers → IE ISA, others → Schwab).
Dedup: external_id = 'finance-mysql:position:<PK>' — idempotent on re-run.
Auth: aiomysql as MySQL root (user-authorized) against the standalone
mysql:8.4 in-cluster service.
New CLI: broker-sync finance-mysql-import
New tests: 5 unit tests covering route, symbol normalise, BUY/SELL
detection.
poetry run pytest -q → 114 passed, 1 skipped
poetry run mypy → clean (aiomysql shielded with type: ignore)
poetry run ruff check → clean
