Request for the coders' behavioral data on Bounty

On Bounty, we could observe who and when participate a Bounty task. However, this kind of data is not available through the provided API (actually, the existing API is mainly from the perspective of **Bounty task**, not participants). So could you please share the coders' behavioral data on Bounty? In detail,
1. **when** did a coder register on the platform?
2. **when** did the coder participate in **which** Bounty task?
3. **when** did the coder submit its solution (of **which** Bounty task)?
4. other fields also related to the coders
A specialized API on users' behavior is quite expected. Of course, it's better to provide the well-organized data directly. Thank you :)