plc-mirror/db-migration/migrations/20240217_partition.sql

alter table records alter content set compression lz4;
alter table records rename to records_like;

create table records
(like records_like including defaults including compression)
partition by list (collection);

drop index idx_repo_record_key;
drop index idx_repo_rev;
alter table records_like drop constraint records_pkey;
create unique index records_pkey on records (id, collection);

create table records_default
partition of records default;

create table records_post
partition of records for values in ('app.bsky.feed.post');
create table records_follow
partition of records for values in ('app.bsky.graph.follow');
create table records_block
partition of records for values in ('app.bsky.graph.block');
create table records_repost
partition of records for values in ('app.bsky.feed.repost');
create table records_profile
partition of records for values in ('app.bsky.actor.profile');

ALTER TABLE records_like
   ADD CHECK (collection in ('app.bsky.feed.like'));

ALTER TABLE records_post
   ADD CHECK (collection in ('app.bsky.feed.post'));

ALTER TABLE records_follow
   ADD CHECK (collection in ('app.bsky.graph.follow'));

ALTER TABLE records_repost
   ADD CHECK (collection in ('app.bsky.feed.repost'));

ALTER TABLE records_profile
   ADD CHECK (collection in ('app.bsky.actor.profile'));

-- SLOW, can run overnight
with moved_rows as (
        delete from records_like r
        where collection <> 'app.bsky.feed.like'
        returning r.*
)
insert into records select * from moved_rows;

-- ULTRA SLOW, DO NOT RUN on large DB
alter table records attach partition records_like for values in ('app.bsky.feed.like');

create index idx_like_subject
on records_like
(split_part(jsonb_extract_path_text(content, 'subject', 'uri'), '/', 3));

create index idx_follow_subject
on records_follow
(jsonb_extract_path_text(content, 'subject'));

create index idx_reply_subject
on records_post
(split_part(jsonb_extract_path_text(content, 'reply', 'parent', 'uri'), '/', 3));