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Editing SQL code for default features in ATLAS

Hi all,

I want to create some custom features in ATLAS but building off of the existing built-in features rather than writing the SQL from scratch. To give an example - the Drug Group features bucket drugs into ATC groups and then look at exposure over a pre-specified time period. I would like to create a feature that does this but over my own custom time periods.

Is the SQL code for the default features available somewhere so that I can copy and edit these?