Initial draft of db schema#3

Draft

nulfrost wants to merge 4 commits intomainfrom

Commits on Dec 12, 2023

start initial draft of schema, add create_hackathons migration
nulfrost
committed

Commits on Dec 13, 2023

create user roles table with migration file
nulfrost
committed
create participants table and relations
nulfrost
committed
update rls rules on the hackathons table to only allow admins and event_coordinators the right to create hackathons
nulfrost
committed