I need to properly identify which column contains the actual numeric metric. Looking at the evidence, I can see there's confusion between the "Days" and "Title_defenses" columns. Let me search for the champion with the longest reign that I saw in step-2: Joe Louis with 4,270 days. {"action": "tool_call", "reasoning": "I saw Joe Louis with 4,270 days in step-2. I need to find which column actually contains this value to understand the data structure correctly.", "tool": "search_rows", "query": "Joe Louis", "limit": 5}