data model question

we are developing a control system that looks at data from multiple sources.
some of the data is extracted from AWS, some from postgres databases, some from hibob (human management reources)

the question is this,

here are my 

1. do I use a disconnected external ETL process or use django for everything

2. do I create all data resources using django data modeling or use the internal management using django and some create manually 

thanks

Yaron

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