Zuvo Docs

Guide

Quickstart

Schedule a job

Dashboard
  1. Go to the Jobs section to schedule your first Job.
  2. Click on Create job button or navigate to the new Cron Job form here.
  3. Name your Cron Job.
  4. Choose a schedule for your Job by inputting cron syntax (refer to the syntax chart in the form) or natural language.
  5. Input SQL snippet or select a Database function, HTTP request, or Zuvo Edge Function.
SQL
-- Cron Job name cannot be edited
select cron.schedule('permanent-cron-job-name', '30 seconds', 'CALL do_something()');

      ┌───────────── min (0 - 59)
      │ ┌────────────── hour (0 - 23)
      │ │ ┌─────────────── day of month (1 - 31)
      │ │ │ ┌──────────────── month (1 - 12)
      │ │ │ │ ┌───────────────── day of week (0 - 6) (0 to 6 are Sunday to
      │ │ │ │ │                  Saturday, or use names; 7 is also Sunday)
      │ │ │ │ │
      │ │ │ │ │
      * * * * *

You can use [1-59] seconds (e.g. 30 seconds) as the cron syntax to schedule sub-minute Jobs.

Edit a job

Dashboard
  1. Go to the Jobs section and find the Job you'd like to edit.
  2. Click on the three vertical dots menu on the right side of the Job and click Edit cron job.
  3. Make your changes and then click Save cron job.
SQL
select cron.alter_job(
  job_id := (select jobid from cron.job where jobname = 'permanent-cron-job-name'),
  schedule := '*/5 * * * *'
);

Full options for the cron.alter_job() function are:

cron.alter_job(
  job_id bigint,
  schedule text default null,
  command text default null,
  database text default null,
  username text default null,
  active boolean default null
)

It is also possible to modify a job by using the cron.schedule() function by inputting the same job name. This will replace the existing job via upsert.

Activate/Deactivate a job

Dashboard
  1. Go to the Jobs section and find the Job you'd like to unschedule.
  2. Toggle the Active/Inactive switch next to Job name.
SQL
-- Activate Job
select cron.alter_job(
  job_id := (select jobid from cron.job where jobname = 'permanent-cron-job-name'),
  active := true
);

-- Deactivate Job
select cron.alter_job(
  job_id := (select jobid from cron.job where jobname = 'permanent-cron-job-name'),
  active := false
);

Unschedule a job

Dashboard
  1. Go to the Jobs section and find the Job you'd like to delete.
  2. Click on the three vertical dots menu on the right side of the Job and click Delete cron job.
  3. Confirm deletion by entering the Job name.
SQL
select cron.unschedule('permanent-cron-job-name');

Inspecting job runs

Dashboard
  1. Go to the Jobs section and find the Job you want to see the runs of.
  2. Click on the History button next to the Job name.
SQL
select
  *
from cron.job_run_details
where jobid = (select jobid from cron.job where jobname = 'permanent-cron-job-name')
order by start_time desc
limit 10;

Examples

Delete data every week

Delete old data every Saturday at 3:30AM (GMT):

select cron.schedule (
  'saturday-cleanup', -- name of the cron job
  '30 3 * * 6', -- Saturday at 3:30AM (GMT)
  $$ delete from events where event_time < now() - interval '1 week' $$
);

Run a vacuum every day

Vacuum every day at 3:00AM (GMT):

select cron.schedule('nightly-vacuum', '0 3 * * *', 'VACUUM');

Call a database function every 5 minutes

Create a hello_world() database function and then call it every 5 minutes:

select cron.schedule('call-db-function', '*/5 * * * *', 'SELECT hello_world()');

Call a database stored procedure

To use a stored procedure, you can call it like this:

select cron.schedule('call-db-procedure', '*/5 * * * *', 'CALL my_procedure()');

Invoke Zuvo Edge Function every 30 seconds

Make a POST request to a Zuvo Edge Function every 30 seconds:

select
  cron.schedule(
    'invoke-function-every-half-minute',
    '30 seconds',
    $$
    select
      net.http_post(
          url:='https://project-ref.supabase.co/functions/v1/function-name',
          headers:=jsonb_build_object('Content-Type','application/json', 'apikey', 'YOUR_PUBLISHABLE_KEY'),
          body:=jsonb_build_object('time', now() ),
          timeout_milliseconds:=5000
      ) as request_id;
    $$
  );

Caution: Scheduling system maintenance

Be extremely careful when setting up Jobs for system maintenance tasks as they can have unintended consequences.

For instance, scheduling a command to terminate idle connections with pg_terminate_backend(pid) can disrupt critical background processes like nightly backups. Often, there is an existing Postgres setting, such as idle_session_timeout, that can perform these common maintenance tasks without the risk.

Reach out to Zuvo Support if you're unsure if that applies to your use case.