create table proposals (
                           id serial primary key,
                           name text not null,
                           cid text not null,
                           summary text,
                           creator text not null,
                           is_current boolean not null, -- true for latest/current version
                           previous_cid text,           -- the CID of the previous version, if any
                           created_at timestamp default now(),
                           updated_at timestamp
)