Order-book recovery

Reconstructs an aggregate book just before the start from an ABCI checkpoint and raw book diffs, then streams filtered diffs, statuses and fills. Max range 2h.

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API: /hl/download?symbol=BTC&t_from=...&t_to=...

Reconstructs a Polymarket asset's captured order book: latest book snapshot before the start, then every frame up to the end. Max range 1h. Read locally on indexer2 (no download).

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API: /pm/download?ids=...&t_from=<ms>&t_to=<ms>