Sympa behaviour when database is down

[ikedas]

Version

6.2.60

Installation method

Expected behavior

There is any option or configuration that could enable sympa to queue incoming email or bounce back to the sender in the event that the database is down.

Actual behavior

Sympa assumes that the list is empty.

Steps to reproduce

When the database server has an outage, any message is delivered to Sympa.

Additional information

This issue was initially reported at:
https://lists.sympa.community/msg/en/2022-09/JvCg-0nZplky_qgYBlwJvA
Follow-up:
https://lists.sympa.community/msg/en/2022-10/KW7MKzdaHSXSwTUvJgsLYQ