fix: quote tdengine history inserts

go/vehicle-gateway/internal/history/writer_test.go

@@ -45,6 +45,13 @@ func TestWriterAppendsRawLocationAndMileage(t *testing.T) {
 	if got := countSQL(exec.calls, "INSERT INTO mil_"); got != 1 {
 		t.Fatalf("mileage insert count = %d", got)
 	}
+	rawInsert := findSQL(exec.calls, "INSERT INTO raw_")
+	if !strings.Contains(rawInsert, "'go_") || !strings.Contains(rawInsert, "'2e") && !strings.Contains(rawInsert, "'") {
+		t.Fatalf("raw insert should quote string literals: %s", rawInsert)
+	}
+	if strings.Contains(rawInsert, "VALUES (?,") {
+		t.Fatalf("raw insert should not use placeholders for tdengine websocket plain insert: %s", rawInsert)
+	}
 }
 
 func TestWriterSkipsSparseDerivedRows(t *testing.T) {
@@ -103,6 +110,15 @@ func countSQL(calls []execCall, pattern string) int {
 	return count
 }
 
+func findSQL(calls []execCall, pattern string) string {
+	for _, call := range calls {
+		if strings.Contains(call.query, pattern) {
+			return call.query
+		}
+	}
+	return ""
+}
+
 type execCall struct {
 	query string
 	args  []any