Dear Michael,
> Or you could do something even shorter, with "invalid_slots.txt".
I think current one seems better, because we only support logical replication
slots for now. We can extend as you said when we support physical slot as well.
Also, proposed length is sufficient for fairywren [1].
[1]: https://www.postgresql.org/message-id/CALj2ACVc-WSx_fvfynt-G3j8rjhNTMZ8DHu2wiKgCEiV9EO86g%40mail.gmail.com
Best Regards,
Hayato Kuroda
FUJITSU LIMITED