Show daily electricity consumption in Grafan as a bar chart

hello everyone,

I would like to display my electricity consumption daily in Grafana as a bar chart.

The data is available in HA in InfluxDB 1.x.

In Grafana, I defined the following query using GrafanaQL:

Query A:

SELECT (last(“value”) - first(“value”)) * -1 AS “Einspeisung”
FROM “Wh”
WHERE “entity_id” = ‘iometer_gesamteinspeisung’
AND $timeFilter
GROUP BY time(1d)
fill(previous)
tz(‘Europe/Berlin’)

Query B:

SELECT (last(“value”) - first(“value”)) AS “Bezug”
FROM “Wh”
WHERE “entity_id” = ‘iometer_gesamtbezug’
AND $timeFilter
GROUP BY time(1d)
fill(previous)
tz(‘Europe/Berlin’)

The time interval is set to seven days:

In principle, all values ​​except the oldest are displayed correctly.

What can I do to ensure that the first value is also displayed correctly?

Thanks in advance for your support.