lead_id,idempotency_key,created_at,updated_at,source,utm_source,utm_campaign,full_name,first_name,email,phone,company,website,job_title,country,company_size,budget_range,timeline,service_interest,message,marketing_consent,stage,tier,ai_fit_score,ai_confidence,ai_next_step,ai_summary,ai_pain_points,ai_signals,ai_owner_notes,ai_problems,ai_language,prompt_version,model,thread_subject,next_message_id,next_message_type,next_message_subject,next_message_body,next_message_created_at,approval,approved_by,send_status,last_contact_at,follow_up_count,next_follow_up_at,last_reply_at,last_reply_id,last_reply_intent,last_reply_summary,meeting_at,meeting_id,opted_out,owner,deal_value,lost_reason,notes