{
    "action": "tool_call",
    "reasoning": "Confirm row count and the span of the only temporal column (ingestion timestamp), plus batch and source file counts, in a single query.",
    "tool": "query_sql",
    "args": {
        "sql": "SELECT COUNT(*) AS row_count, MIN(_ingestion_timestamp) AS first_ingested, MAX(_ingestion_timestamp) AS last_ingested, COUNT(DISTINCT _batch_id) AS batches, COUNT(DISTINCT _source_file) AS source_files FROM raw.iris",
        "purpose": "Confirm row count and ingestion span, batches and source files",
        "source": "raw"
    }
}