Remove no longer used sql directory

sql/crawler.sql

-
--- -- return a random sample of repos, containing %percent repositories
--- create or replace function repos_random_sample_array(percent real)
--- returns setof repos as $$
--- declare
---     samples integer;
---     repo repos%rowtype;
---     ids integer[];
--- begin
---     select floor(count(*) / 100 * percent) into samples from repos;
---     ids := array(select id from repos order by id);
---     for i in 1 .. samples loop
---      select * into repo
---          from repos
---          where id = ids[round(random() * samples)];
---      return next repo;
---     end loop;
---     return;
--- end
--- $$
--- language plpgsql;
-
--- return a random sample of repositories
-create or replace function repos_random_sample(percent real)
-returns setof repos as $$
-declare
-    sample_size integer;
-begin
-    select floor(count(*) / 100 * percent) into sample_size from repos;
-    return query
-        select * from repos
-        order by random()
-        limit sample_size;
-    return;
-end
-$$
-language plpgsql;
-
--- -- return a random sample of repositories
--- create or replace function random_sample_sequence(percent real)
--- returns setof repos as $$
--- declare
---     sample_size integer;
---     seq_size integer;
---     min_id integer;
---     max_id integer;
--- begin
---     select floor(count(*) / 100 * percent) into sample_size from repos;
---     select min(id) into min_id from repos;
---     select max(id) into max_id from repos;
---     seq_size := sample_size * 3;  -- IDs are sparse, generate a larger sequence
---                                   -- to have enough of them
---     return query
---         select * from repos
---         where id in
---             (select floor(random() * (max_id - min_id + 1))::integer
---                     + min_id
---              from generate_series(1, seq_size))
---         order by random() limit sample_size;
---     return;
--- end
--- $$
--- language plpgsql;
-
-create or replace function repos_well_known()
-returns setof repos as $$
-begin
-    return query
-        select * from repos
-	where full_name like 'apache/%'
-	   or full_name like 'eclipse/%'
-	   or full_name like 'mozilla/%'
-	   or full_name = 'torvalds/linux'
-	   or full_name = 'gcc-mirror/gcc';
-    return;
-end
-$$
-language plpgsql;
-
-create table crawl_history (
-    id       bigserial primary key,
-    repo     integer references repos(id),
-    task_id  uuid,  -- celery task id
-    date     timestamptz not null,
-    duration interval,
-    status   boolean,
-    result   json,
-    stdout   text,
-    stderr   text
-);
-
-create index on crawl_history (repo);
-
-create view missing_orig_repos AS
-    select *
-    from orig_repos as repos
-    where not exists
-        (select 1 from crawl_history as history
-	 where history.repo = repos.id);
-
-create view missing_fork_repos AS
-    select *
-    from fork_repos as repos
-    where not exists
-        (select 1 from crawl_history as history
-	 where history.repo = repos.id);