- Update docker-compose.yml to map host port 8100 -> container 8000
- Update all Playwright test BASE_URL to port 8100
- Update .env.example with documentation about port mapping
- This avoids conflicts with other services on port 8000
- Add DatabentoHistoricalPriceSource implementing HistoricalPriceSource protocol
- Smart caching with Parquet storage and metadata tracking
- Auto symbol-to-dataset resolution (GLD→XNAS.BASIC, GC=F→GLBX.MDP3)
- Cache management with age threshold invalidation
- Cost estimation via metadata.get_cost()
- Add databento>=0.30.0 to requirements.txt
- Add DATABENTO_API_KEY to .env.example
- Full test coverage with 16 tests
