currently the aggregator module stores the feed urls in a varchar (256) field - this is too short for a fair number of feeds though (eg ebay feeds are often over 256 characters long) I've changed the url field type to text (512) which is big enough - this seems to work ok.

i hope this is helpful to someone and that it is in the right place - i'm using the release 4.7.3 version currently with the defult aggregator module. if this is the wrong place for this bug/feature then please move it.