this is just fine. you are only at risk if your db libs/frameworks have no checks for if collision does some day occur. For example, as an id being a primary key in a db table, your db will cough up an error if you get collision, but will your ruby/python/blub libs/frameworks handle it gracefully?
Is it not a simple thing to require "unique" of the table column? ...and then if the occasional "error" occurs in attempt to create a new row in table have your framework retry until your randomizing routine succeeds in generating an unused ID? Or am I missing something?
