fix(backup): reimport postgres dump on restore (restore was a no-op)

The db service dumped the DB on backup (pg_dump pre-hook) but shipped no
restore hook, and a file-level restore does not reload into the running
postgres, so a restored backup silently kept the live (un-restored) state.
Add pg_backup.sh (backup=pg_dump|gzip into the postgresql_data volume;
restore=terminate conns + DROP DATABASE WITH FORCE + createdb + reimport),
mount it via a config, and wire the backupbot backup/restore hooks. Same
fix as the immich / mattermost-lts / ghost recipes.

abra.sh

@@ -1 +1,2 @@
 export DB_ENTRYPOINT_VERSION=v1
+export PG_BACKUP_VERSION=v1

compose.yml

@@ -63,6 +63,9 @@ services:
       - source: db_entrypoint
         target: /docker-entrypoint.sh
         mode: 0555
+      - source: pg_backup
+        target: /pg_backup.sh
+        mode: 0555
     entrypoint: /docker-entrypoint.sh
     environment:
       - POSTGRES_HOST_AUTH_METHOD=trust
@@ -72,9 +75,9 @@ services:
     deploy:
       labels:
         backupbot.backup: "true"
-        backupbot.backup.pre-hook: "bash -c 'PGPASSWORD=$$(cat $${POSTGRES_PASSWORD_FILE}) pg_dump -U $${POSTGRES_USER} $${POSTGRES_DB} > /tmp/backup.sql'"
-        backupbot.backup.post-hook: "rm -rf /tmp/backup.sql"
-        backupbot.backup.path: "/tmp/backup.sql"
+        backupbot.backup.pre-hook: "/pg_backup.sh backup"
+        backupbot.backup.volumes.postgresql_data.path: "backup.sql"
+        backupbot.restore.post-hook: "/pg_backup.sh restore"
 
   redis:
     image: redis:7.4-alpine
@@ -130,5 +133,8 @@ networks:
 configs:
   db_entrypoint:
     name: ${STACK_NAME}_db_entrypoint_${DB_ENTRYPOINT_VERSION}
+  pg_backup:
+    name: ${STACK_NAME}_pg_backup_${PG_BACKUP_VERSION}
+    file: pg_backup.sh
     file: entrypoint.postgres.sh.tmpl
     template_driver: golang

pg_backup.sh

@@ -0,0 +1,34 @@
+#!/bin/bash
+
+# Postgres backup/restore hook for the discourse `db` service. Invoked by backupbot-two via:
+#   backupbot.backup.pre-hook                     = "/pg_backup.sh backup"
+#   backupbot.backup.volumes.postgresql_data.path = "backup.sql"
+#   backupbot.restore.post-hook                   = "/pg_backup.sh restore"
+# Backup dumps the DB to backup.sql (gzip) inside the postgresql_data volume; backupbot archives it.
+# Restore reimports it. Discourse (the rails app + sidekiq) keeps TCP connections open to the DB, so
+# restore must terminate them and FORCE-drop before recreating, then reimport the dump deterministically.
+# The previous recipe shipped a pg_dump backup but NO restore hook — a file-level restore did not reload
+# into the running postgres, so a restored backup silently kept the live (un-restored) state. cc-ci
+# caught this: a seeded ci_marker row was gone after restore. Same pattern as the immich / mattermost-lts
+# / ghost recipe-PRs.
+
+set -e
+
+BACKUP_FILE='/var/lib/postgresql/data/backup.sql'
+export PGPASSWORD=$(cat "${POSTGRES_PASSWORD_FILE:-/run/secrets/db_password}")
+DB_USER="${POSTGRES_USER:-discourse}"
+DB_NAME="${POSTGRES_DB:-discourse}"
+
+function backup {
+  pg_dump -U "$DB_USER" "$DB_NAME" | gzip > "$BACKUP_FILE"
+}
+
+function restore {
+  psql -U "$DB_USER" -d postgres -c \
+    "SELECT pg_terminate_backend(pid) FROM pg_stat_activity WHERE datname='${DB_NAME}' AND pid<>pg_backend_pid();"
+  psql -U "$DB_USER" -d postgres -c "DROP DATABASE ${DB_NAME} WITH (FORCE);"
+  createdb -U "$DB_USER" "$DB_NAME"
+  gunzip -c "$BACKUP_FILE" | psql -U "$DB_USER" -d "$DB_NAME" -1 -v ON_ERROR_STOP=1 -f -
+}
+
+$@