lemmy/migrations/2023-12-22-040137_make-mixed-sorting-directions-work-with-tuple-comparison/up.sql

CREATE FUNCTION reverse_timestamp_sort (t timestamp with time zone)
    RETURNS bigint
    AS $$
BEGIN
    RETURN (-1000000 * EXTRACT(EPOCH FROM t))::bigint;
END;
$$
LANGUAGE plpgsql
IMMUTABLE PARALLEL SAFE;

CREATE INDEX idx_post_aggregates_community_published_asc ON public.post_aggregates USING btree (community_id, featured_local DESC, reverse_timestamp_sort (published) DESC);

CREATE INDEX idx_post_aggregates_featured_community_published_asc ON public.post_aggregates USING btree (community_id, featured_community DESC, reverse_timestamp_sort (published) DESC);

CREATE INDEX idx_post_aggregates_featured_local_published_asc ON public.post_aggregates USING btree (featured_local DESC, reverse_timestamp_sort (published) DESC);

CREATE INDEX idx_post_aggregates_published_asc ON public.post_aggregates USING btree (reverse_timestamp_sort (published) DESC);