> I`m not understand clearly proposed (and someway implemented)
> architecture, but I think, you shiuld use unsigned int for counting if
> there are no plans for bidirectional cursors implementation. In other
> case, signed int is better (but I can not image DB with 10^9 records).

Before you have corrected yourself :)

In russian newsgroup Alexey Voytsehovich said it has a production DB
with ~150 mio. records with 7 mio. records per day comming in and daily
deletes of all records that are older than 15 days (application collects
measurment data from 250 sensors).

Roman