Deadline-reminder schedule now provisioned in infra-terraform (prod) — recap

[alexeygrigorev]

Context

The recurring deadline-reminder schedule is now provisioned entirely in infra-as-code (DataTalksClub/infra-terraform), tracked in infra-terraform#1. The old CMP shell script + manual GitHub Actions workflow have already been removed from this repo — there is nothing for CMP to provision at runtime. This issue is just a recap so the CMP side knows what to keep working.

What was provisioned in Terraform

A new file cmp_deadline_reminder.tf adds:

• An EventBridge rule running daily at 09:00 UTC (cron(0 9 * * ? *)).
• An ECS target that launches the prod task as a one-off Fargate task, overriding the container command to:

  python manage.py send_deadline_reminders
  

• An invocation role EventBridge assumes (ecs:RunTask on course-management-prod:* + iam:PassRole on the execution role).

Details:

• Account 387546586013, region eu-west-1
• Cluster: course-management-cluster
• Task family: course-management-prod (the schedule references the family, so it always runs the latest active revision that CI/CD deploys — no pinning to a stale revision)
• Container name in override: course-management-prod

What CMP needs to keep working

• The management command python manage.py send_deadline_reminders must continue to exist and run to completion as a one-off task (it reconciles Datamailer recipient lists, triggers sends, and exits).
• It runs against prod env/secrets, using the shared Datamailer instance (DATAMAILER_URL = https://datamailer.dtcdev.click, same host for dev and prod).
• If the container name in the prod task definition ever changes from course-management-prod, the EventBridge containerOverrides[].name in cmp_deadline_reminder.tf must be updated to match — otherwise the override is silently ignored.

What does NOT need changing

• No GitHub Actions / CI involvement. The CI deploy user (course-management-ci-cd-deploy-user) needs no scheduling permissions — no scheduler:*, iam:CreateRole, or iam:PassRole. terraform apply creates everything.

Notes

• Schedule runs once per day at 09:00 UTC. To change the cadence or time, it's a one-line edit in cmp_deadline_reminder.tf (schedule_expression).