entity_history

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history(entity) — the CHEAP INDEX of one entity's dates (the place across time). `entity_type` deposit|infrastructure|company| project + `id`. Returns: `frames` — the imagery index over its coordinates (scene dates, cloud cover, scene ids, counts by year; NO images — fetch stills with `look_at` or a stack with `look_through`, the paid calls); `snapshots` — our record of the row since record time began (2026-10-03 19:29Z: versions with the fields that changed; before that "not recorded online"); `what_changed` — a short newest-first list (relationship began / ended with its basis, first stated by a source, capacity periods, events naming the company, our actions on the row, dataset releases matched), every item `time_is` "world" (a date a source states) or "ours" (when we acted). Nothing inferred. AUTH: an agent key; browser sessions follow the graph-read rule. SIDE EFFECTS: none beyond the charge — read-only. ⚠ CHARGING: one price at the basic class (look_from's price); an entity that does not exist is a 404 and costs nothing; quote with `billing_quote("/api/v1/entity.history")`. NOT the account's own query history (that is a different route).