lemmy/migrations/2024-12-05-233704_add_person_content_combined_table/up.sql

-- Creates combined tables for
-- person_content: (comment, post)
-- person_saved: (comment, post)
CREATE TABLE person_content_combined (
    id serial PRIMARY KEY,
    published timestamptz NOT NULL,
    post_id int UNIQUE REFERENCES post ON UPDATE CASCADE ON DELETE CASCADE,
    comment_id int UNIQUE REFERENCES COMMENT ON UPDATE CASCADE ON DELETE CASCADE,
    -- Make sure only one of the columns is not null
    CHECK ((post_id IS NOT NULL)::integer + (comment_id IS NOT NULL)::integer = 1)
);

CREATE INDEX idx_person_content_combined_published ON person_content_combined (published DESC, id DESC);

CREATE INDEX idx_person_content_combined_published_asc ON person_content_combined (reverse_timestamp_sort (published) DESC, id DESC);

-- Updating the history
INSERT INTO person_content_combined (published, post_id)
SELECT
    published,
    id
FROM
    post;

INSERT INTO person_content_combined (published, comment_id)
SELECT
    published,
    id
FROM
    comment;

-- This one is special, because you use the saved date, not the ordinary published
CREATE TABLE person_saved_combined (
    id serial PRIMARY KEY,
    published timestamptz NOT NULL,
    post_id int UNIQUE REFERENCES post ON UPDATE CASCADE ON DELETE CASCADE,
    comment_id int UNIQUE REFERENCES COMMENT ON UPDATE CASCADE ON DELETE CASCADE,
    -- Make sure only one of the columns is not null
    CHECK ((post_id IS NOT NULL)::integer + (comment_id IS NOT NULL)::integer = 1)
);

CREATE INDEX idx_person_saved_combined_published ON person_saved_combined (published DESC, id DESC);

CREATE INDEX idx_person_saved_combined_published_asc ON person_saved_combined (reverse_timestamp_sort (published) DESC, id DESC);

-- Updating the history
INSERT INTO person_saved_combined (published, post_id)
SELECT
    saved,
    post_id
FROM
    post_actions
WHERE 
    saved IS NOT NULL;

INSERT INTO person_saved_combined (published, comment_id)
SELECT
    saved,
    comment_id
FROM
    comment_actions
WHERE 
    saved IS NOT NULL;