Django orm and no primary key

Hello,

I am wondering if it is possible to still use the django orm without
having a primary key at all, I currently got a table holding 61 million
entries soon gonna expand to hold 600 million entries, that table never
need to identify one entry alone its only to pull off statistics based
on other fields, so far I dropped the primary key index in the database
and all works fine, but I know the orm always want a primary key, would
it still work if I for example claim one of the fields which aren't
unique as the primary key?

Or is the only way to do it, use the cursor or even mysqldb directly?

Greetings,
Thorsten

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