diff --git a/docs/设计文档.md b/docs/设计文档.md
index 41bc0a0..a1907f1 100644
--- a/docs/设计文档.md
+++ b/docs/设计文档.md
@@ -16,5 +16,6 @@
 | 字段 | 类型         | 空   | 默认 | 注释                         |
 | ---- | ------------ | ---- | ---- | ---------------------------- |
 | id   | int  | 否   |      | 自增ID                       |
-| path | VARCHAR(255) | 否   |      | 图片上传成功后对应的绝对路径 |
+| path | VARCHAR(255) | 否   |      | 图片上传成功后对应的相对路径 |
+| type | VARCHAR(20) | 否 | | 图床类型 |
 
diff --git a/lib/utils/db_provider.dart b/lib/utils/db_provider.dart
index 91749ef..24f3c12 100644
--- a/lib/utils/db_provider.dart
+++ b/lib/utils/db_provider.dart
@@ -53,7 +53,8 @@ class DbProvider {
           await db.execute('''
           CREATE TABLE uploaded (
             id INTEGER PRIMARY KEY AUTOINCREMENT,
-            path varchar(255) NOT NULL
+            path varchar(255) NOT NULL,
+            type varchar(20) NOT NULL UNIQUE
           )''');
           await db.transaction((txn) async {
             int id1 = await txn.rawInsert(