Fix PostgreSQL backup socket

start.sh

@@ -73,7 +73,7 @@ backup_postgres() {
   bucket_dump="$BACKUP_DIR/.latest.$$.dump"
   rm -f "$local_dump" "$bucket_dump"
 
-  if ! su-exec postgres pg_dump -Fc -d "$DATABASE_DBNAME" -f "$local_dump"; then
+  if ! su-exec postgres pg_dump -h /tmp -U "$DATABASE_USER" -Fc -d "$DATABASE_DBNAME" -f "$local_dump"; then
     rm -f "$local_dump"
     return 1
   fi
@@ -177,11 +177,18 @@ if [ "$NEW_CLUSTER" -eq 1 ] && [ "$MIGRATED" -eq 0 ] && [ -s "$BACKUP_FILE" ]; t
     echo "Persistent PostgreSQL backup is invalid" >&2
     exit 1
   fi
-  su-exec postgres pg_restore --clean --if-exists --no-owner --exit-on-error -d "$DATABASE_DBNAME" "$restore_dump"
+  su-exec postgres pg_restore -h /tmp -U "$DATABASE_USER" \
+    --clean --if-exists --no-owner --exit-on-error \
+    -d "$DATABASE_DBNAME" "$restore_dump"
   rm -f "$restore_dump"
   echo "PostgreSQL restore completed"
 fi
 
+if ! backup_postgres; then
+  echo "Initial PostgreSQL backup failed" >&2
+  exit 1
+fi
+
 start_redis
 attempt=0
 until redis-cli -h 127.0.0.1 -p 6379 ping 2>/dev/null | grep -q PONG; do