Thanks a lot!
@backtrader Thanks! I will try reformatting by using matplotlib then :)
There is an additional path: use Docs - Timers
You can watch day 1 of each month and only take action if the month is 3, 6, 9 or 12 or implement a callable which does the calculation and pass it to allow
A classic example is in the Docs - Quickstart. But there is no specific documentation about classic strategies (some examples you may find implement a Moving Average CrossOver)