Fix traffic by hour histogram

[cotosso]

fix out of order histograms dates when using "big" time periods (approx more then 15/30 days)

before:

after:

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

[gsanchietti]

The new query is wrong: remove the SUM call.
The error is quite evident inside the new chart.

[cotosso]

Even using the original query (that has no SUM) and adding at the end this line to ensure the right chronological order:

+ ORDER BY bucket

the resulting graph is exactly the same, it still has this kind of "SUM" effect

[gsanchietti]

So I guess the query is still wrong.
Please review the returned records.