chore: move DB stuff over from sites repo

Author: benmccann

db/README.md

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+# Database setup
+
+Login to [Supabase](https://supabase.com) and create a database. Once done, you should be on your database's dashboard. Duplicate the `.env.example` file and rename it to `.env.local`, and set these environment variables:
+
+- `SUPABASE_URL`: The config URL
+- `SUPABASE_KEY`: The public API key
+
+Then, navigate to your database's "SQL Editor", click on "New query", and paste in [setup.sql](./setup.sql). Run this SQL to seed the database and you're good to go.

db/setup.sql

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+-- drop everything
+alter table if exists public.gist drop constraint if exists gist_userid_fkey;
+alter table if exists public.session drop constraint if exists session_userid_fkey;
+drop index if exists gist_owner_idx;
+
+drop table if exists public.user;
+drop table if exists public.session;
+drop table if exists public.gist;
+drop table if exists public.todo;
+
+drop function if exists public.get_user;
+drop function if exists public.gist_create;
+drop function if exists public.gist_update;
+drop function if exists public.gist_destroy;
+drop function if exists public.login;
+drop function if exists public.logout;
+
+create table public.user (
+	id bigserial primary key,
+	created_at timestamptz default now(),
+	updated_at timestamptz,
+	github_id int8 unique,
+	github_name text,
+	github_login text,
+	github_avatar_url text
+);
+
+create table public.session (
+	id uuid default extensions.uuid_generate_v4() not null primary key,
+	created_at timestamptz default now(),
+	userid int8,
+	expires timestamptz default now() + '1 year'
+);
+
+create table public.gist (
+	id uuid default extensions.uuid_generate_v4() not null primary key,
+	created_at timestamptz default now(),
+	name text,
+	files json,
+	userid int8,
+	updated_at timestamptz,
+	deleted_at timestamptz
+);
+
+create table public.todo (
+	uid uuid default extensions.uuid_generate_v4() not null primary key,
+	created_at timestamptz default now(),
+	guestid uuid not null,
+	text text,
+	done boolean
+);
+
+-- foreign key relations
+alter table public.gist add constraint gist_userid_fkey foreign key (userid) references public.user (id);
+alter table public.session add constraint session_userid_fkey foreign key (userid) references public.user (id);
+
+-- indexes
+create index gist_owner_idx on public.gist using btree (userid);
+create index todo_owner_idx on public.todo using btree (guestid);
+
+-- functions
+create or replace function public.get_user (sessionid uuid)
+returns record
+language plpgsql volatile
+as $$
+	declare
+		ret record;
+		_ record;
+	begin
+		select userid from session where session.id = sessionid into _;
+
+		select id, github_name, github_login, github_avatar_url from public.user into ret where public.user.id = _.userid;
+
+		return ret;
+	end;
+$$;
+
+create or replace function public.gist_list (
+	list_search text,
+	list_userid int8,
+	list_count int4,
+	list_start int4
+)
+returns table (
+	id uuid,
+	name text,
+	created_at timestamptz,
+	updated_at timestamptz
+)
+language plpgsql volatile
+as $$
+	begin
+		return query
+		select gist.id, gist.name, gist.created_at, gist.updated_at
+		from gist
+		where gist.userid = list_userid and gist.deleted_at is null and gist.name ilike ('%' || list_search || '%')
+		order by coalesce(gist.updated_at, gist.created_at) desc
+		limit list_count + 1
+		offset list_start;
+	end;
+$$;
+
+create or replace function public.gist_create (name text, files json, userid int8)
+returns record
+language plpgsql volatile
+as $$
+	declare
+		ret record;
+	begin
+		insert into gist (name, files, userid)
+		values (name, files, userid) returning gist.id, gist.name, gist.files, gist.userid into ret;
+
+		return ret;
+	end;
+$$;
+
+create or replace function public.gist_destroy (
+	gist_ids uuid[],
+	gist_userid int8
+)
+returns void
+language plpgsql volatile
+as $$
+	begin
+		update gist set deleted_at = now() where id = any(gist_ids) and userid = gist_userid;
+	end;
+$$;
+
+create or replace function public.gist_update (
+	gist_id uuid,
+	gist_name text,
+	gist_files json,
+	gist_userid int8
+)
+returns record
+language plpgsql volatile
+as $$
+	declare
+		ret record;
+	begin
+		update gist
+			set name = gist_name, files = gist_files, updated_at = now()
+			where id = gist_id and userid = gist_userid and deleted_at is null
+			returning id, name, files, userid into ret;
+
+		return ret;
+	end;
+$$;
+
+create or replace function public.login (
+	user_github_id int8,
+	user_github_name text,
+	user_github_login text,
+	user_github_avatar_url text
+)
+returns record
+language plpgsql volatile
+as $$
+	declare
+		_ record;
+		ret record;
+	begin
+		insert into "user" (github_id, github_name, github_login, github_avatar_url, updated_at)
+		values (user_github_id, user_github_name, user_github_login, user_github_avatar_url, now())
+		on conflict (github_id) do update set github_name = user_github_name, github_login = user_github_login, github_avatar_url = user_github_avatar_url, updated_at = now() where public."user".github_id = user_github_id
+		returning id into _;
+
+		insert into "session" (userid) values (_.id) returning session.id as sessionid, session.userid, session.expires into ret;
+
+		return ret;
+	end;
+$$;
+
+create or replace function public.logout (
+	sessionid uuid
+)
+returns void
+language plpgsql volatile
+as $$
+	begin
+		delete from session where id = sessionid;
+	end;
+$$;