Provider data specification

online.json: QuestDB tables, all physical attributes and synthetic examples.
history.json: ClickHouse tables, all physical attributes and synthetic examples.
catalog.json: both inventories and provenance.
payload-contracts.json: nested domain contracts and examples.
binary-formats.json: binary / Arrow envelopes and examples.
source-ddl.json: source DDL templates.
contents-manifest.json: exact file sizes and SHA-256.

Snapshot: 2026-10-12; local Provider inventory. Server schema parity is unverified.
Examples are synthetic; no account rows or credentials.
