Racing condition with pre_delete

[Sebastian Haase]

I often run into a bug when the client triggers multiple http requests resulting each in a delete.

My objects have a „sibling index“ field, where I use pre_delete to update all siblings „above“ to lower their index by 1 (using update with an F-expression).

Any idea why this would not work reliably? I use Postgres as db-backend.

Thx, Sebastian.