This reverts commit 5f4a945182.
The cure is worse than the original disease.
The main installation cursor often holds exclusive locks (due to DDL
changes) on vital tables such as res_users. As a result, using
another cursor to perform changes while the main cursor is waiting
is extremely deadlock-prone. And these deadlocks can't be detected by
PostgreSQL as they mix Python-SQL locking, which leads to deadlocked
HTTP workers.
Related to:
- opw-1916918
- #29528
Olivier Dony
eb19016ba3