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Context
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Phase 1 kickoff: Trading212 tags every ticker with `_EQ`, sometimes
preceded by a lowercase exchange letter ("l" = LSE) or `_US`. Raw
symbols like `VUAGl_EQ` are an implementation detail that would leak
into Wealthfolio and diverge from other providers (InvestEngine and
Schwab emit `VUAG` / `META`). The canonical form has to match across
providers so portfolio aggregation lines up.
Unlike the finance/ reference code, we do NOT restrict to a
SUPPORTED_TICKERS allowlist here — Wealthfolio is the source of truth,
everything gets imported, and the user decides what to track.
This change
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- broker_sync/providers/trading212.py: pure `_normalise_ticker`
helper backed by a single regex that peels `(_US)?[a-z]?_EQ`. No
lookup tables — the rule covers all observed shapes.
- tests/providers/test_trading212_ticker.py: parametrised cases for
every mapping called out in the Phase 1 plan plus pass-through of
already-canonical symbols.
Test plan
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## Automated
- poetry run pytest -q → 41 passed in 0.46s
- poetry run mypy broker_sync tests → Success: no issues found in 22 source files
- poetry run ruff check . → All checks passed!
## Manual Verification
Not applicable — pure function, no external side effects.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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