Multi Database + Huge lookups

Hi

I've a big project implemented in Delphi/C++/MSSQL that I want to migrate to the WEB and Python/Django is my choice.

But I'm getting some dificulties probably due to the backgroud I came from.

1-

I've have several databases One of them is for static tables like zipcodes Districts countrys, and a lot more stuff they rarely change, the others are one per enterprise/domain, taht all share common data on the statis one.

Is this solution implementable under django?

2- 

I've huge tables like ZIP codes milions or records how to do a foreign key that is not in a select but in an autocomplete. (is this django builtin)?

3-

Several times I've lookups where I copy more info than the key, for exemple in an invoice I copy the ClientID, but also the adress do the invoice, so if the adress changes in a future the invoice is imutable...

I would appreciate help to Kickstart me

Regards

Alexandre Rua

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