Cut the comment bloat from the Podman playbooks

Comment blocks now stay within three lines and explain only the non-obvious. Long histories, include examples, and commented-out code are gone. No task, key, or value changed; the only data change is comment text inside the generated unit files.

wikijs/roles/postgres/handlers/main.yaml

@@ -1,13 +1,6 @@
 ---
-# Postgres is its own playbook (postgres/playbook.yml) and a rootless Quadlet
-# unit there. This handler runs as the connection user, so `systemctl --user`
-# works without setting XDG_RUNTIME_DIR.
-#
-# Required by postgres/roles/attach, which notifies it whenever this app's
-# drop-in changes: a new drop-in changes the generated unit, so Postgres must be
-# recreated to join the network — Quadlet has no live equivalent of
-# `podman network connect`. That is a few seconds of downtime for every attached
-# app, not just this one. See postgres/readme.md, "The trade-off".
+# A new drop-in changes the generated unit, so Postgres must be recreated to join the network.
+# That restarts every attached app, not just this one.
 - name: Restart Postgres
   ansible.builtin.systemd_service:
     name: "{{ postgres_unit }}"

wikijs/roles/postgres/tasks/main.yaml

@@ -1,32 +1,11 @@
 ---
-# Attach this app's network to the shared Postgres unit.
-#
-# Postgres knows nothing about its clients, exactly like Caddy: a service joins
-# by dropping 50-hiwikijs.conf and the shared 10-network-aliases.conf next to
-# postgres.container. The canonical way to do that is the shared include below —
-# it writes the same bytes every service writes, asserts that hiwikijs.network
-# already exists, and notifies the "Restart Postgres" handler defined in this
-# role.
-#
-# This runs in the roles phase, which is after the register include in
-# playbook.yml's pre_tasks has created hiwikijs.network.
 
+# Runs in the roles phase, after the register include in pre_tasks created the network.
 - name: Attach Wiki.js to Postgres
   ansible.builtin.include_tasks: "{{ playbook_dir }}/../postgres/roles/attach/tasks/main.yaml"
 
-# On a first attach both drop-ins are new, so Postgres has to be recreated to
-# join hiwikijs_net — and the shared 10-network-aliases.conf is what creates the
-# `db` alias DB_HOST asks for. That restart is a *handler*, which by default runs
-# at the end of the play, after the wikijs role has already started the app. The
-# app would then come up before `db` resolves, fail its own HTTP probe, and fail
-# the play on a machine where nothing is actually wrong.
-#
-# Flushing applies the new drop-in before the app starts. On later runs the
-# drop-ins are unchanged, nothing is pending, and this is a no-op.
-#
-# Note that flush_handlers flushes *everything* pending, which includes the
-# "Restart Caddy" that the register include notified in pre_tasks — and that is
-# the right thing here: the Caddy drop-in is new too, and Caddy has to be
-# recreated to join the network before it can proxy to hiwikijs.
+# The restart is a handler, so it would run after the wikijs role starts the app.
+# Flushing applies the new drop-in before the app starts; later runs are a no-op.
+# Flush also applies Caddy's pending restart, which is right: Caddy must join the network to proxy.
 - name: Apply the Postgres network change before starting Wiki.js
   ansible.builtin.meta: flush_handlers