{
    "action": "tool_call",
    "reasoning": "I have the total rows and columns from the previous step. Now I need to find the time period the dataset covers by looking for the minimum and maximum values of temporal columns across the dataset.",
    "tool": "query_sql",
    "args": {
        "purpose": "Find the overall time period covered by the dataset",
        "source": "raw",
        "sql": "SELECT table_name, column_name, min_value, max_value FROM analytics.column_overview WHERE phys_type LIKE '%TIMESTAMP%' OR phys_type LIKE '%DATE%' OR semantic_role = 'datetime' ORDER BY min_value ASC LIMIT 20;"
    }
}