Do not create partitions that are not to be retained

[nicolagi]

Suppose retention is set to 4 months for a monthly partitioned table foo.

Suppose run_maintenance fails to run for whatever reason and as a consequence foo has only a very old partition, say, foo_p20010101.
When run_maintenance runs again in 2024 it will create lots of partitions.
The vast majority of them will be expired at the subsequent run.

Would it make sense to not create those in the first place?
Perhaps the timestamp to start creating partitions from should be something like MAX(NOW() - retention, last_partition_timestamp)?