diff --git a/server/internal/library/imtenant/db.go b/server/internal/library/imtenant/db.go
index 374d1f5..8d85d39 100644
--- a/server/internal/library/imtenant/db.go
+++ b/server/internal/library/imtenant/db.go
@@ -148,7 +148,10 @@ func replaceMySQLDatabase(link string, dbName string) (string, error) {
 
 func normalizeMySQLTimeOptions(link string) (string, error) {
 	if !strings.HasPrefix(link, "mysql:") {
-		return "", gerror.New("租户业务库仅支持 MySQL")
+		if !strings.Contains(link, "@tcp(") {
+			return "", gerror.New("租户业务库仅支持 MySQL")
+		}
+		link = "mysql:" + link
 	}
 	parts := strings.SplitN(link, "?", 2)
 	values := make(url.Values)
diff --git a/server/internal/library/imtenant/db_test.go b/server/internal/library/imtenant/db_test.go
index 727c173..cbabad0 100644
--- a/server/internal/library/imtenant/db_test.go
+++ b/server/internal/library/imtenant/db_test.go
@@ -6,6 +6,25 @@ import (
 	"testing"
 )
 
+func TestNormalizeMySQLTimeOptions(t *testing.T) {
+	link, err := normalizeMySQLTimeOptions("user:pass@tcp(127.0.0.1:3306)/tinode?charset=utf8mb4")
+	if err != nil {
+		t.Fatalf("normalize raw mysql dsn: %v", err)
+	}
+	if !strings.HasPrefix(link, "mysql:user:pass@tcp(127.0.0.1:3306)/tinode?") {
+		t.Fatalf("unexpected normalized link: %s", link)
+	}
+	if !strings.Contains(link, "loc=UTC") || !strings.Contains(link, "parseTime=true") {
+		t.Fatalf("missing required time options: %s", link)
+	}
+}
+
+func TestNormalizeMySQLTimeOptionsRejectsUnsupportedFormat(t *testing.T) {
+	if _, err := normalizeMySQLTimeOptions("postgres://user:pass@127.0.0.1:5432/tinode"); err == nil {
+		t.Fatal("expected unsupported format error")
+	}
+}
+
 func TestReplaceMySQLDatabaseUsesUTC(t *testing.T) {
 	link, err := replaceMySQLDatabase("mysql:user:pass@tcp(127.0.0.1:3306)/hotgo?loc=Local&parseTime=false&charset=utf8mb4", "tinode")
 	if err != nil {