dns queries: set cache-control header

chdb/geoqueries.go

@@ -197,7 +197,7 @@ func (d *ClickHouse) DNSQueries(ctx context.Context) ([]DNSQueryCounts, error) {
 	ctx, span := tracing.Tracer().Start(ctx, "DNSQueries")
 	defer span.End()
 
-	startUnix := time.Now().Add(-90 * time.Minute).Unix()
+	startUnix := time.Now().Add(2 * time.Hour * -1).Unix()
 	startUnix -= startUnix % (60 * 5)
 
 	log.InfoContext(ctx, "start time", "start", startUnix)

server/server.go

@@ -288,6 +288,9 @@ func (srv *Server) dnsQueryCounts(c echo.Context) error {
 		return c.String(http.StatusInternalServerError, err.Error())
 	}
 
+	hdr := c.Response().Header()
+	hdr.Set("Cache-Control", "s-maxage=30,max-age=60")
+
 	return c.JSON(http.StatusOK, data)
 }