Inspector
The Parquet database as files: browse the tick partitions, the Sierra store and the live partials; see a file's schema and rows; run read-only SQL (DuckDB) over any of them. Nothing here writes.
SQL (read-only, 2000 rows at most)
DuckDB SQL; paths must stay inside the parquet root. Globs work: read_parquet('…/trading_date=2026-09-1*/*.parquet', filename = true).