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backend/migrations/000001_init.sql

@@ -315,7 +315,7 @@ CREATE TABLE system_configs (
 
 CREATE TABLE chat_conversations (
   id BIGINT UNSIGNED PRIMARY KEY AUTO_INCREMENT,
-  order_id BIGINT UNSIGNED NOT NULL,
+  order_id BIGINT UNSIGNED NULL,
   type VARCHAR(32) NOT NULL DEFAULT 'order_group',
   title VARCHAR(128) NOT NULL,
   status VARCHAR(32) NOT NULL DEFAULT 'active',

backend/migrations/000004_support_chat.sql

@@ -0,0 +1,2 @@
+ALTER TABLE chat_conversations
+  MODIFY order_id BIGINT UNSIGNED NULL;