fix: preserve school configuration metadata

src/main/java/com/sztzjy/linkCommerce/service/impl/SchoolProductConfigServiceImpl.java

@@ -60,6 +60,7 @@ public class SchoolProductConfigServiceImpl implements SchoolProductConfigServic
                 && hasAdministrativeOrganizationData(config.getSchoolId())) {
             throw new ServiceException(HttpStatus.BAD_REQUEST, "学校已有组织数据，不能直接切换组织模式");
         }
+        config.setCreateTime(current.getCreateTime());
         config.setUpdateTime(new Date());
         schoolProductConfigMapper.updateByPrimaryKey(config);
         return getRequiredConfig(config.getSchoolId());

src/test/java/com/sztzjy/linkCommerce/service/impl/SchoolProductConfigServiceImplTest.java

@@ -7,6 +7,8 @@ import com.sztzjy.linkCommerce.mapper.SchoolProductConfigMapper;
 import com.sztzjy.linkCommerce.mapper.UserinfoMapper;
 import org.junit.jupiter.api.Test;
 
+import java.util.Date;
+
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertThrows;
 import static org.junit.jupiter.api.Assertions.assertTrue;
@@ -83,6 +85,23 @@ class SchoolProductConfigServiceImplTest {
                 config("school-standard", "TEACHING_CLASS_ONLY", "TEACHER")));
     }
 
+    @Test
+    void updateKeepsTheOriginalCreationTime() {
+        SchoolProductConfigServiceImpl service = new SchoolProductConfigServiceImpl();
+        service.schoolProductConfigMapper = mock(SchoolProductConfigMapper.class);
+        service.schoolClassMapper = mock(SchoolClassMapper.class);
+        service.userinfoMapper = mock(UserinfoMapper.class);
+        SchoolProductConfig current = config("school-standard", "ADMIN_CLASS_ENABLED", "SCHOOL_ADMIN");
+        Date createdAt = new Date(1000L);
+        current.setCreateTime(createdAt);
+        when(service.schoolProductConfigMapper.selectByPrimaryKey("school-standard")).thenReturn(current);
+
+        service.updateConfig(config("school-standard", "ADMIN_CLASS_ENABLED", "SCHOOL_ADMIN"));
+
+        verify(service.schoolProductConfigMapper).updateByPrimaryKey(org.mockito.ArgumentMatchers.argThat(updated ->
+                createdAt.equals(updated.getCreateTime())));
+    }
+
     private SchoolProductConfig config(String schoolId, String organizationMode, String rosterOwner) {
         SchoolProductConfig config = new SchoolProductConfig();
         config.setSchoolId(schoolId);