change, change_pct and volume were `unwrap_or(0)` when the provider
omitted them (MSN quotes and screener rows; Yahoo with no previous
close), so "unknown" read as "unchanged, zero volume". They are now
Option fields that serialize as null when missing. The table shows "-",
and the performers screens sort unknown changes last in both
directions. Present values are unchanged and cached entries still load.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ld3fDSDiBzAaQvgZJX5NKM
MSN stamps each IDX trading day at local midnight (17:00Z the previous
day), so every MSN candle was labelled one day early. Yahoo weekly and
monthly bars have the same stamp and were labelled Sunday / last day of
the previous month. Take the date in the exchange offset instead: Yahoo's
meta.gmtoffset when present, else WIB (UTC+7).
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Ld3fDSDiBzAaQvgZJX5NKM
MSN Finance/Charts does not serve OHLCV data for XIDX stocks (returns 404).
Following the FP principle of not exposing capabilities a provider cannot fulfil:
- Remove impl HistoryProvider for MsnProvider entirely
- Remove fetch_charts from MsnClient
- Remove parse_chart_history, resample_history, trim_history_to_period from map.rs
- Remove MsnChart, ChartSeries, RawChart from raw_types.rs
- Remove parse_history_from_str, parse_close_only_history from parse.rs
- Decouple HistoryProvider from MarketDataProvider trait bound
- Add history_provider() factory: returns None for MSN, Some(Yahoo) for Yahoo
- CLI gates History/Technical on history_provider(), fails fast for MSN
- MSN mock returns Err(Unsupported); tests verify the behaviour explicitly
