lemmy/migrations/2019-10-19-052737_create_user_mention/up.sql

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CREATE TABLE user_mention (
id serial PRIMARY KEY,
recipient_id int REFERENCES user_ ON UPDATE CASCADE ON DELETE CASCADE NOT NULL,
comment_id int REFERENCES COMMENT ON UPDATE CASCADE ON DELETE CASCADE NOT NULL,
read boolean DEFAULT FALSE NOT NULL,
published timestamp NOT NULL DEFAULT now(),
UNIQUE (recipient_id, comment_id)
);
CREATE VIEW user_mention_view AS
SELECT
c.id,
um.id AS user_mention_id,
c.creator_id,
c.post_id,
c.parent_id,
c.content,
c.removed,
um.read,
c.published,
c.updated,
c.deleted,
c.community_id,
c.banned,
c.banned_from_community,
c.creator_name,
c.score,
c.upvotes,
c.downvotes,
c.user_id,
c.my_vote,
c.saved,
um.recipient_id
FROM
user_mention um,
comment_view c
WHERE
um.comment_id = c.id;