From 95cc472037fcb3207b510e67f1a44af4e2a2cae9 Mon Sep 17 00:00:00 2001 From: Ellie Huxtable Date: Thu, 18 Apr 2024 16:41:28 +0100 Subject: chore: move crates into crates/ dir (#1958) I'd like to tidy up the root a little, and it's nice to have all the rust crates in one place --- .../20220419082412_add_count_trigger.sql | 51 ++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 crates/atuin-server-postgres/migrations/20220419082412_add_count_trigger.sql (limited to 'crates/atuin-server-postgres/migrations/20220419082412_add_count_trigger.sql') diff --git a/crates/atuin-server-postgres/migrations/20220419082412_add_count_trigger.sql b/crates/atuin-server-postgres/migrations/20220419082412_add_count_trigger.sql new file mode 100644 index 00000000..dd1afa88 --- /dev/null +++ b/crates/atuin-server-postgres/migrations/20220419082412_add_count_trigger.sql @@ -0,0 +1,51 @@ +-- Prior to this, the count endpoint was super naive and just ran COUNT(1). +-- This is slow asf. Now that we have an amount of actual traffic, +-- stop doing that! +-- This basically maintains a count, so we can read ONE row, instead of ALL the +-- rows. Much better. +-- Future optimisation could use some sort of cache so we don't even need to hit +-- postgres at all. + +create table total_history_count_user( + id bigserial primary key, + user_id bigserial, + total integer -- try and avoid using keywords - hence total, not count +); + +create or replace function user_history_count() +returns trigger as +$func$ +begin + if (TG_OP='INSERT') then + update total_history_count_user set total = total + 1 where user_id = new.user_id; + + if not found then + insert into total_history_count_user(user_id, total) + values ( + new.user_id, + (select count(1) from history where user_id = new.user_id) + ); + end if; + + elsif (TG_OP='DELETE') then + update total_history_count_user set total = total - 1 where user_id = new.user_id; + + if not found then + insert into total_history_count_user(user_id, total) + values ( + new.user_id, + (select count(1) from history where user_id = new.user_id) + ); + end if; + end if; + + return NEW; -- this is actually ignored for an after trigger, but oh well +end; +$func$ +language plpgsql volatile -- pldfplplpflh +cost 100; -- default value + +create trigger tg_user_history_count + after insert or delete on history + for each row + execute procedure user_history_count(); -- cgit v1.3.1