pg_cron / seems job never executed

I tried to execute a simples CRON job with pg_cron by following the official tutorial https://supabase.io/blog/2021/03/05/postgres-as-a-cron-server and it’s not working for me.

Where I’m now: I have the pg_cron extension installed by supabase UI; I have the simplest CRON job which looks like

SELECT cron.schedule(
'* * * * *',
$$
  DELETE FROM data
  WHERE id=1
$$
);

if I execute SELECT * FROM cron.job; I will get it in the list of scheduled jobs. But at the end of the day, it never will be executed.

What I already try to do:

• disable/enable extension
• create a brand new project and redo steps following the guide

Any ideas on how I can handle this issue?

_Originally posted by @Miruzz in https://github.com/supabase/supabase/discussions/1628_

[dragarcia]

Hey everyone 👋, finally found a quick remedy. Do follow this flow when using the pg_cron extension on the dashboard:

---

0. [OPTIONAL] Drop all scheduled jobs and the pg_cron extension itself

• This is important if you already have pg_cron enabled and have jobs set

-- repeat as much to clear all jobs
select cron.unschedule(<job id>); 

-- drop the extension
drop extension if exists pg_cron;

1. Enable pg_cron

create extension if not exists pg_cron;

2. [IMPORTANT] Provide the following grants to the user postgres (and in the future any other user that would be using the cron schema). At the baseline, it seems pg_cron uses the postgres user when executing its schedule.

grant usage on schema cron to postgres;
grant all privileges on all tables in schema cron to postgres;

3. Create sample table test_table

CREATE TABLE test_table (
  id bigint GENERATED BY DEFAULT AS IDENTITY PRIMARY KEY,
  inserted_at timestamp with time zone DEFAULT timezone('utc'::text, now()) NOT NULL,
  updated_at timestamp with time zone DEFAULT timezone('utc'::text, now()) NOT NULL,
  name text
);

4. Run a CRON job via pg_cron to add a row to this sample table

select
  cron.schedule(
    'whack-every-minute', 
    '* * * * *', 
    $$
    insert into test_table(name) values ('kek');
    $$
  );

5. Observe that the table test_table is now being populated every minute

select * from test_table;

[dragarcia]

Hey guys! Not much at the moment but we are inching towards finding the root cause. Sorry about that. We’ll update you on any major progress.