ALTER TABLE qipai_orders
  ADD COLUMN status_version INT UNSIGNED NOT NULL DEFAULT 1 AFTER status,
  ADD COLUMN status_updated_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3)
    AFTER status_version;

CREATE TABLE IF NOT EXISTS qipai_order_status_history (
  id BIGINT UNSIGNED NOT NULL AUTO_INCREMENT PRIMARY KEY,
  tenant_id BIGINT UNSIGNED NOT NULL,
  order_id BIGINT UNSIGNED NOT NULL,
  from_status VARCHAR(32) NULL,
  to_status VARCHAR(32) NOT NULL,
  action VARCHAR(32) NOT NULL,
  actor_type VARCHAR(32) NOT NULL,
  actor_id BIGINT UNSIGNED NULL,
  source VARCHAR(32) NOT NULL,
  reason VARCHAR(512) NOT NULL DEFAULT '',
  trace_id VARCHAR(128) NOT NULL,
  metadata JSON NOT NULL,
  created_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3),
  CONSTRAINT fk_qipai_order_history_tenant
    FOREIGN KEY (tenant_id) REFERENCES qipai_tenants(id),
  CONSTRAINT fk_qipai_order_history_order
    FOREIGN KEY (order_id) REFERENCES qipai_orders(id),
  UNIQUE KEY uq_qipai_order_history_trace (tenant_id, order_id, trace_id),
  KEY idx_qipai_order_history_order (tenant_id, order_id, id),
  KEY idx_qipai_order_history_status (tenant_id, to_status, created_at)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;

INSERT IGNORE INTO qipai_order_status_history
  (tenant_id, order_id, from_status, to_status, action, actor_type,
   actor_id, source, reason, trace_id, metadata, created_at)
SELECT tenant_id, id, NULL, status, 'MIGRATED', 'SYSTEM',
       NULL, 'MIGRATION', 'M04-B baseline history',
       CONCAT('m04b-migration-', id), JSON_OBJECT('statusVersion', 1), created_at
FROM qipai_orders;

INSERT IGNORE INTO qipai_schema_migrations (version, name)
VALUES ('2026062012', 'm04b_order_state_machine');