Pro and Internal only. Downloads one day of history as a zstd Parquet file. Columns: event_id, market_id, market_key, market_name, period, subject_key, subject_id, subject_name, outcome_id, outcome_name, side, line, bookmaker, observed_at (UTC, milliseconds), kind, decimal_odds, implied_probability. The ETag is the file's SHA-256. At most two downloads at a time per key. Each download bills one object. A file that names a player whose identity came under review after it was built answers 503 until it is rebuilt overnight.