{
    "action": "tool_call",
    "reasoning": "I've already checked columns_catalog for exact duplicates on (tables_catalog_id, column_name, ordinal) and found none. Now I need to check the other major tables for duplicates. I'll start with job_logs, which is the second-largest table at 303,822 rows. I'll check for duplicates on what would be natural keys for a job log entry.",
    "tool": "inspect_columns",
    "args": {
        "table": "job_logs"
    }
}