c8beb7e3ae3253b4baa75dd38d9465dd1272d195
One class per provider (TwelveData, Oanda, Tiingo), all subclassing BaseDataProvider which owns cache, validation/cleaning, freshness + boundary guarantees, fetch_range pagination, and streaming stubs — subclasses implement only _fetch_raw. config.json data_providers.active selects the live feed; data_provider.py / oanda_provider.py stay as back-compat shims. Module 16 provider-abstraction tests (253 total green). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Mc7XKYyPySVXiUpcN82QEK
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