refactor(go): remove realtime schema compatibility cleanup

go/vehicle-gateway/internal/realtime/snapshot_writer_test.go

@@ -7,6 +7,8 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/DATA-DOG/go-sqlmock"
+
 	"lingniu-vehicle-ingest/go/vehicle-gateway/internal/envelope"
 )
 
@@ -79,6 +81,27 @@ func TestSnapshotWriterEnsuresSchemaAndUpsertsCoreSnapshot(t *testing.T) {
 	}
 }
 
+func TestSnapshotWriterEnsureSchemaOnlyCreatesTargetTables(t *testing.T) {
+	db, mock, err := sqlmock.New()
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer db.Close()
+	writer := NewSnapshotWriter(db)
+
+	mock.ExpectExec("CREATE TABLE IF NOT EXISTS vehicle_realtime_snapshot").
+		WillReturnResult(sqlmock.NewResult(0, 0))
+	mock.ExpectExec("CREATE TABLE IF NOT EXISTS vehicle_realtime_location").
+		WillReturnResult(sqlmock.NewResult(0, 0))
+
+	if err := writer.EnsureSchema(context.Background()); err != nil {
+		t.Fatalf("EnsureSchema() error = %v", err)
+	}
+	if err := mock.ExpectationsWereMet(); err != nil {
+		t.Fatalf("unexpected compatibility migration query: %v", err)
+	}
+}
+
 func TestSnapshotWriterUpsertsRealtimeLocationWhenCoordinatesExist(t *testing.T) {
 	exec := &recordingSnapshotExec{}
 	writer := NewSnapshotWriter(exec)