修复数据库迁移问题、新增环境变量读写

tests/test_db_group.py

@@ -0,0 +1,37 @@
+import pytest
+
+@pytest.mark.asyncio
+async def test_group_curd():
+    """测试数据库的增删改查"""
+    from models import database
+    from models.group import Group
+    
+    await database.init_db(url='sqlite:///:memory:')
+    
+    # 测试增 Create
+    test_group = Group(name='test_group')
+    created_group = await Group.create(test_group)
+    
+    assert created_group is not None
+    assert created_group.id is not None
+    assert created_group.name == 'test_group'
+    
+    # 测试查 Read
+    fetched_group = await Group.get(id=created_group.id)
+    assert fetched_group is not None
+    assert fetched_group.id == created_group.id
+    assert fetched_group.name == 'test_group'
+    
+    # 测试更新 Update
+    updated_group = await Group.set(
+        id=fetched_group.id,
+        name='updated_group')
+    
+    assert updated_group is not None
+    assert updated_group.id == fetched_group.id
+    assert updated_group.name == 'updated_group'
+    
+    # 测试删除 Delete
+    await Group.delete(id=updated_group.id)
+    deleted_group = await Group.get(id=updated_group.id)
+    assert deleted_group is None