diff --git a/kb/dao/dataset_dao.go b/kb/dao/dataset_dao.go
index 1358bc6..e5552d7 100644
--- a/kb/dao/dataset_dao.go
+++ b/kb/dao/dataset_dao.go
@@ -42,10 +42,9 @@ func init() {
 		{"chunk_overlap", "chunk_overlap INTEGER NOT NULL DEFAULT 150"},
 		{"chunk_strategy", "chunk_strategy TEXT NOT NULL DEFAULT 'title'"},
 	} {
-		var n int
-		err := g.DB(consts.DbGroupDefault).Ctx(ctx).GetScan(ctx, &n,
+		cnt, err := g.DB(consts.DbGroupDefault).Ctx(ctx).GetValue(ctx,
 			"SELECT COUNT(*) FROM pragma_table_info('"+consts.TableNameDataset+"') WHERE name=?", col.name)
-		if err != nil || n > 0 {
+		if err != nil || cnt.Int64() > 0 {
 			continue
 		}
 		if _, err := g.DB(consts.DbGroupDefault).Exec(ctx,
diff --git a/kb/dao/model_config_dao.go b/kb/dao/model_config_dao.go
index 1850ed6..464b0a2 100644
--- a/kb/dao/model_config_dao.go
+++ b/kb/dao/model_config_dao.go
@@ -38,18 +38,19 @@ func init() {
 		g.Log().Warningf(ctx, "create model_config table failed: %v", err)
 	}
 	// 迁移：旧库补 is_default 列，并把 system_config 中的旧默认对话模型键迁移为 is_default
-	var n int
-	if err := g.DB(consts.DbGroupSystem).Ctx(ctx).GetScan(ctx, &n,
-		"SELECT COUNT(*) FROM pragma_table_info('"+consts.TableNameModelConfig+"') WHERE name=?", "is_default"); err == nil && n == 0 {
+	// 注意：GetScan 只支持 struct/slice 指针，标量查询用 Value
+	cnt, err := g.DB(consts.DbGroupSystem).Ctx(ctx).GetValue(ctx,
+		"SELECT COUNT(*) FROM pragma_table_info('"+consts.TableNameModelConfig+"') WHERE name=?", "is_default")
+	if err == nil && cnt.Int64() == 0 {
 		if _, err := g.DB(consts.DbGroupSystem).Exec(ctx, "ALTER TABLE "+consts.TableNameModelConfig+" ADD COLUMN is_default INTEGER NOT NULL DEFAULT 0"); err != nil {
 			g.Log().Warningf(ctx, "alter model_config add is_default failed: %v", err)
 		} else {
-			var old int64
-			if err := g.DB(consts.DbGroupSystem).Ctx(ctx).GetScan(ctx, &old,
-				"SELECT cfg_value FROM system_config WHERE cfg_key='default_chat_model'"); err == nil && old > 0 {
+			old, err := g.DB(consts.DbGroupSystem).Ctx(ctx).GetValue(ctx,
+				"SELECT cfg_value FROM system_config WHERE cfg_key='default_chat_model'")
+			if err == nil && old.Int64() > 0 {
 				if _, err := g.DB(consts.DbGroupSystem).Exec(ctx,
 					"UPDATE "+consts.TableNameModelConfig+" SET is_default=CASE WHEN id=? THEN 1 ELSE 0 END WHERE model_type=?",
-					old, consts.ModelTypeChat); err != nil {
+					old.Int64(), consts.ModelTypeChat); err != nil {
 					g.Log().Warningf(ctx, "migrate default_chat_model to is_default failed: %v", err)
 				}
 			}