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Richard, please don't close yet, I will look into this when
time permits, hopefully within the next two weeks. I suspect
the following behaviour:
- We changed the database schema from within sqlite also in
our own tracker installation from which we were upgrading.
In particular the "ID" field was of type "integer". 
- With some of our detectors we experienced that we got the
id as a numeric value in python, not as a string
- Maybe when changing the schema some of the field contents
was not moved because the lookup (looking up with a string
ID for a value that is an integer or vice versa) might have
cause the problem. 
So this is probably caused by us hacking the SQL schema but
a fix might nevertheless prove beneficial if you intend to
change the type of some of roundup's types to 'integer' in
an SQL database. So I'll investigate this and try to find
out where the things get lost.
Ralf