Add teams /1: database definitions

[rth]

This is part 1 of the effort to add teams discussed in #505 (comment) , and is a subset of changes from this PR

For now this updates changes the DB definitions, to make the review easier,

• Removes the previous team link mechanism from the Team table (acceptor_id, initiator_id) which wasn't used
• Add Team.is_individual field to distinguish between individual and non individual teams
• Add a new UserTeam table which does many to many relationships between teams and users.

This would require a DB migration, but there is already a commit on main which would require it.

[pep8speaks]

Hello @rth! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

There are currently no PEP 8 issues detected in this Pull Request. Cheers! 🍻

Comment last updated at 2021-10-13 16:03:53 UTC

[codecov]

Codecov Report

Merging #545 (d403151) into master (31919f7) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #545      +/-   ##
==========================================
- Coverage   93.48%   93.47%   -0.01%     
==========================================
  Files         103      103              
  Lines        8882     8922      +40     
==========================================
+ Hits         8303     8340      +37     
- Misses        579      582       +3     

Impacted Files	Coverage Δ
ramp-database/ramp_database/model/event.py	98.85% <100.00%> (ø)
ramp-database/ramp_database/model/submission.py	95.65% <100.00%> (+0.02%)	⬆️
ramp-database/ramp_database/model/team.py	100.00% <100.00%> (ø)
...mp-database/ramp_database/model/tests/test_team.py	100.00% <100.00%> (ø)
ramp-engine/ramp_engine/base.py	92.68% <0.00%> (-1.22%)	⬇️
ramp-engine/ramp_engine/dispatcher.py	96.42% <0.00%> (-1.20%)	⬇️

---

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[agramfort]

@rth WIP or MRG?

[rth]

It's MRG. The idea is to split the large PR above into smaller chunks,

• first one (current PR) to add the appropriate fields in the DB
• then the functions to create / delete / join teams to ramp-database
• and finally all the template/HTML rendering changes

to make it easier to review. The first two steps wouldn't affect the functionality of the ramp-board as it currently works. Well aside from the 1st one requiring a DB migration.

[agramfort]

thx @rth