A packet repeats once per observer in the site scan, so grouping can
collapse a scan_depth window to fewer packets than the page asked for.
That short page set hasMore=false and stranded all older history: YOW
dead-ended after 45 packets, ~6 minutes back.
Report scan saturation and the floor the scans covered, and treat a
saturated short page as more data. Clamp the cursor to the floor so
paging on cannot skip the band the scan never read.
MrAlders0n
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