It doesn't even have to be that complicated. How many bugs and contributors can a project have?
Add a bug_id_lockfile where you claim a namespace that starts with a letter, and if you sync up and someone has already claimed that namespace, you have to change and rename your bugs. The time of the checkin determines who gets it. There might be a couple bugs you have to rename, if you don't sync up right away.
So my bugs would start with A, yours with B, and so on. Once you get to 26 contributors you do two letters, etc.
Add a bug_id_lockfile where you claim a namespace that starts with a letter, and if you sync up and someone has already claimed that namespace, you have to change and rename your bugs. The time of the checkin determines who gets it. There might be a couple bugs you have to rename, if you don't sync up right away.
So my bugs would start with A, yours with B, and so on. Once you get to 26 contributors you do two letters, etc.