Context
-------
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
-----------
- 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
---------
## 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>
Context
-------
Every broker connector needs a uniform shape so the orchestrator can
fan out without knowing provider-specific details. Normalisation (GBP
conversion) lives outside providers on purpose — keeping providers
native-currency-emitters means we can re-normalise historical activity
when HMRC rates land without re-fetching from the broker.
This change
-----------
- providers/base.py: Provider Protocol with `accounts()` and async
`fetch(since, before)` iterator. No abstract base class — duck-typed
Protocol so each concrete provider stays independent.
- normaliser.py: takes a native Activity + FxCache, returns a copy
with amount_gbp/fx_rate_gbp/fx_rate_source filled in. Two modes:
qty*price for BUY/SELL, amount for DIVIDEND/DEPOSIT/etc.
- Namespace packages for providers/, providers/parsers/, sinks/ so
future modules slot in cleanly.
Test plan
---------
## Automated
- poetry run pytest -q → 23 passed
- poetry run mypy broker_sync tests → Success: no issues found in 14 source files
- poetry run ruff check . → All checks passed!
## Manual Verification
Not applicable at this layer.
