I opened a trial BioMail JE site with blank database. When users
started to add their data searches were spread through days of
week equaly. At some point when about 400 users added searches
a new day with index 2147483647 appeared. After that users could
not add new searches. As a fast and durty solution I moved all
bad searches to a 'real' week day. This problem did not appear
again...