Date range was wrong when too many runs were selected

[jilavsky]

I only selected range of dates (2023-02-07 to 2023-04-07) and Gemviz consistently displayed range of was up to 2023-04-15. This was resent after I also used selection for Plan. After that it started to work fine, but looks like the number of runs in selected date range - ~50k - overwhelmed something inside. It may be necessary to limit number of runs downloaded at any given time to something sensible. Selection works with smaller number of runs. I tested 9 days of operations (~9k runs) and behavior was much better.