get_index_valuation

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NSE's own daily OHLC + P/E + P/B + Div Yield time series for one named index. `index` is matched case-insensitively against NSE's own published index names (e.g. "Nifty 50", "Nifty Bank", "Nifty IT", "Nifty Auto", "Nifty FMCG", "India VIX" — use get_india_vix for a VIX-specific shape). `from_date`/`to_date` are optional ISO dates (default: trailing ~30 days; window capped at 1825 days). Sourced from NSE's own daily `ind_close_all` file, which carries NSE's ALREADY-COMPUTED P/E, P/B, Div Yield for every index it publishes — sector indices (Nifty Bank, Nifty IT, ...) give an official NSE sector-valuation band, a DIFFERENT figure from get_sector_overview's peer-derived median_pe/median_pb (this project's own aggregate over its tracked universe, grouped by a different taxonomy) — the two are independent, neither validates the other. An unrecognized `index` returns `reason_code: "no_data"` with `available_indices_hint` (every index name NSE publishes) — see also list_index_valuations. Raw NSE-published figures only.