After updating to version 6.4.3 I changed the Data storage period housekeeping history from 3 days to 7 days. 

Before the change when selecting 3 days the graph was generated by history (graph 3 days history.jpg)

After changing the history retention period to 7 days and waiting for the retention period the charts are being generated as trends.
In debug mode when selecting 7 days we have the information that the graph was generated from trends (graph 7 days trends.png).

When I select a shorter period within the 7 days ex. 06/05/2023 the data is generated by history(graph 1 day history.jpg)

Analyzing the database table we can see that we have records with 7 days (registry database.jpg)

date conversion(convertion date.jpg)