Point-in-time fundamentals

Financial statement metrics as a tidy series: one row per metric and fiscal period. Quarterly results from 2002 and annual statements from 1999 where the company reported them; updated as results are declared. Every row carries available_from, the date the value became public. Pass as_of to see only what was public on that date, with the value as it was then (before any later restatement) — the backtest-safe view. Where more than one reading exists for the same metric and period, a populated value is preferred over an empty one, then a non-zero value over a 0 (one dataset rounds to whole crore, so small figures can read 0 there), then the primary dataset over the secondary, then the most recently published reading on or before as_of. A reported 0 that means "not reported" is not published as a value: periods where total assets, total liabilities or share capital read 0 are omitted, and revenue reading 0 while the same period shows non-zero operating expenses is published as value: null. Defaults to the last 10 years of periods. Rows are ordered by period end (oldest first by default; order=desc for newest first), then in a fixed metric order.