```json { "action": "tool_call", "reasoning": "I have the row and column counts from step-0, showing 51 tables with 2,061,290 total rows. Now I need to determine the time period coverage. Steps 1-4 returned no rows, suggesting those queries didn't find temporal columns. I should search for date/timestamp columns across all tables to identify the time range. Let me query the metadata to find all temporal columns and their min/max values.", "tool": "query_sql", "args": { "sql": "SELECT table_name, column_name, phys_type, min_value, max_value FROM meta.columns WHERE phys_type IN ('DATE', 'TIMESTAMP', 'TIMESTAMP WITH TIME ZONE') AND min_value IS NOT NULL ORDER BY min_value LIMIT 50", "purpose": "Find all date/timestamp columns with their min and max values to determine the dataset's time period coverage", "source": "raw" } } ```