lemmy/server/migrations/2019-03-05-233828_create_co.../up.sql

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create table comment (
id serial primary key,
creator_id int references user_ on update cascade on delete cascade not null,
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post_id int references post on update cascade on delete cascade not null,
parent_id int references comment on update cascade on delete cascade,
content text not null,
removed boolean default false,
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published timestamp not null default now(),
updated timestamp
);
create table comment_like (
id serial primary key,
user_id int references user_ on update cascade on delete cascade not null,
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comment_id int references comment on update cascade on delete cascade not null,
post_id int references post on update cascade on delete cascade not null,
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score smallint not null, -- -1, or 1 for dislike, like, no row for no opinion
published timestamp not null default now(),
unique(comment_id, user_id)
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);