{
    "action": "tool_call",
    "reasoning": "I need to confirm the exact row count and check the min and max values of the only temporal column (_ingestion_timestamp) to determine the time period covered.",
    "tool": "query_sql",
    "args": {
        "purpose": "Get row count and time period covered by ingestion timestamp",
        "source": "raw",
        "sql": "SELECT COUNT(*) as row_count, MIN(_ingestion_timestamp) as min_time, MAX(_ingestion_timestamp) as max_time FROM raw.titanic"
    }
}