for b in $(find /mnt/save -type f | sort | tail -n 1); do
   if [ -n "$b" ]; then
      if du -sh "$b" | grep -Ei "^[ ]*(4|2[0-9])(.0)?[Kk]"; then
         echo would rm empty backup $b >&2
         set -x
         mv "$b" "${b%/*}/.${b##*/}"
         set +x
         continue
      fi
      echo restoring $b >&2
      if psql $DATABASE_URL < "$b"; then
         break
      fi
   fi
done
service postgresql start