docs: 文档提交

docs/待办移动到历史表.md

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+```sql
+
+-- 传入你的 taskId
+set @taskId = 'f5e730e3bfaf57ce00af7c0f7228958a';
+
+start transaction;
+
+-- 1. 归档到历史表
+insert into sys_flow_task_his (his_id,
+                               task_id,
+                               instance_id,
+                               node_code,
+                               node_name,
+                               approver_id,
+                               status,
+                               comment,
+                               audit_time,
+                               company_id,
+                               is_read,
+                               create_by,
+                               create_time,
+                               update_by,
+                               update_time)
+select replace(uuid(), '-', '')                      as his_id,
+       t.task_id,
+       t.instance_id,
+       t.node_code,
+       t.node_name,
+       t.approver_id,
+       case
+           when i.status = 1 then 1
+           when i.status in (2, 9) then 2
+           else 2
+           end                                       as status,
+       '手工归档待办'                                as comment,
+       coalesce(i.finish_time, t.update_time, now()) as audit_time,
+       t.company_id,
+       t.is_read,
+       t.create_by,
+       t.create_time,
+       t.update_by,
+       t.update_time
+from sys_flow_task t
+         left join sys_flow_instance i
+                   on i.instance_id = t.instance_id
+where t.task_id = @taskId
+  and not exists (select 1
+                  from sys_flow_task_his th
+                  where th.task_id = t.task_id
+                    and th.instance_id = t.instance_id);
+
+-- 2. 删除当前待办
+delete
+from sys_flow_task
+where task_id = @taskId
+  and exists (select 1
+              from sys_flow_task_his th
+              where th.task_id = @taskId
+                and th.instance_id = sys_flow_task.instance_id);
+
+commit;
+
+```