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Consider a task: we want to create an extension _before_ citus in a database. Currently `post_bootstrab` script is executed before `CitusHandler.bootstrap()` method, which seems to allow doing that, but in fact `CitusHandler.bootstrap()` will fail to create already existing database and as a result the whole bootstrap will fail. Changing the order of execution of `post_bootstrab` hook and `CitusHandler.bootstrap()` seems to be useless, because it will not allow creating another extension _before_ citus. Therefore the only way of solving it is making CREATE DATABASE and CREATE EXTENSION idempotent. It will allow to create citus database and all dependencies from the `post_bootstrab` hook.