HealthLog/docs/ops/deploy.md

Deploy ordering

Coolify handles the standard deploy ordering automatically: the container image is pulled, docker-entrypoint.sh runs prisma migrate deploy against the live database, and only then does the Next.js process bind to the listener. This page documents the ordering explicitly for manual-rollback and partial-deploy scenarios where the operator drives the steps by hand.

Migration ordering

Migrations land before the new app container takes traffic. The canonical command sequence on a single-instance host:

# 1. Pull the new image.
docker pull ghcr.io/mbombeck/healthlog:vX.Y.Z

# 2. Run migrations against the live DB using the new image.
docker run --rm --env-file .env.production \
  ghcr.io/mbombeck/healthlog:vX.Y.Z \
  pnpm prisma migrate deploy

# 3. Recreate the app container so it picks up the new image.
docker compose up -d app

The entrypoint also runs prisma migrate deploy on container boot, so step 2 is redundant in normal Coolify flow. It's listed explicitly for the manual case so an operator can verify the migration result before flipping traffic.

What goes wrong if you reverse it

If the new app container starts before migrations run, the legacy schema is missing the columns / indexes / enum values the new code expects. Symptoms: Prisma client throws P2022 column does not exist on the first query that touches the new shape, the request path 500s, and the dispatcher logs fill with the same error until the migration catches up. Health checks usually keep the container marked "healthy" because /api/version doesn't exercise the affected tables — so a naïve load balancer will happily route real traffic into the broken shell.

Rollback

Rolling back migrations is generally one-way. Prisma's migration history table tracks applied migrations by hash; the down step is not auto-generated and most HealthLog migrations are forward-only (column drops, enum additions, index rebuilds). If a release has to roll back:

1. Roll back the app container to the previous image tag.
2. Leave the database schema at the newer migration. The previous app version reads forward-compatible-ish shapes for nearly every release pair shipped on the v1.4.x line.
3. If a column-drop migration ships in the rollback target, hand-roll the column back via a fresh forward migration (pnpm prisma migrate dev --create-only --name vX_Y_Z_rollback_<col>), edit the SQL, commit, and re-deploy. Never migrate resolve --rolled-back against production unless you've taken a fresh pg_dump first.

Verify the served version

The queued-deploy status is not the source of truth — the version /api/version actually answers is. A BuildKit layer-cache hit can re-ship the prior image even when Coolify reports a clean deploy, so always confirm the served build after a deploy:

# Asserts prod + demo serve 1.9.0, prints each target's buildSha,
# exits non-zero on a mismatch or timeout after a bounded retry loop.
pnpm dlx tsx scripts/assert-deploy.ts 1.9.0

Pass --only=prod / --only=demo to check a single target, or --attempts=N --interval=ms to widen the retry window while a slow pull settles.