Function downloadTickers

Download one hour of tickers for an instrument as a Lastra segment Serves exactly one hour of raw ticker data for the given instrument on the requested exchange. The payload is a native Lastra file — QTSurfer's columnar format for tick-precision timeseries — with no JSON envelope.

One segment = one hour, aligned to UTC. The hour query parameter selects the segment and must match YYYY-MM-DDTHH (no minutes/seconds, no timezone suffix). Example: hour=2026-01-15T10 returns h10.lastra for 2026-01-15, covering [10:00:00Z, 11:00:00Z). Hours not yet available return 404.

A format=parquet query parameter switches the response to on-the-fly Parquet conversion via lastra-convert for clients that don't yet read Lastra. Lastra is the primary format and cheaper when the client can consume it.

Clients:

• lastra-java — reference Java reader/writer with per-column codecs (ALP, Gorilla, delta-varint, ZSTD) and CRC32 integrity.
• lastra-ts — TypeScript reader (~4 kB bundle, browser + Node.js).
• duckdb-lastra — DuckDB extension for ad-hoc SQL over Lastra files.
• lastra-convert — CLI + Java API for converting to/from Parquet, Reef, and CSV.
• curl -OJ for offline dumps (the Content-Disposition header sets a descriptive filename).