-- Explicit additive migration. No business tables are changed and no historical records are purged.
CREATE TABLE IF NOT EXISTS bi_asset_ai_questions (
  id CHAR(36) PRIMARY KEY,
  actor_id VARCHAR(64) NOT NULL,
  user_id VARCHAR(64) NOT NULL,
  login_name VARCHAR(255) NOT NULL,
  user_name VARCHAR(255) NOT NULL,
  permission_level VARCHAR(24) NOT NULL,
  is_preview TINYINT(1) NOT NULL DEFAULT 0,
  preview_session_id VARCHAR(64) NULL,
  session_id VARCHAR(64) NULL,
  base_result_id VARCHAR(64) NULL,
  result_id VARCHAR(64) NULL,
  subject VARCHAR(150) NULL,
  event_type VARCHAR(24) NOT NULL,
  question TEXT NULL,
  action_json JSON NULL,
  outcome VARCHAR(24) NOT NULL,
  reason VARCHAR(64) NULL,
  business_types JSON NULL,
  engine VARCHAR(24) NULL,
  answer MEDIUMTEXT NULL,
  started_at DATETIME(3) NOT NULL,
  finished_at DATETIME(3) NULL,
  duration_ms BIGINT UNSIGNED NULL,
  KEY user_time (user_id, started_at),
  KEY actor_time (actor_id, started_at),
  KEY result_time (outcome, started_at),
  KEY session_time (session_id, started_at),
  KEY event_time (event_type, started_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;