2👍
I found the answer myself. Basically the [:n] puts a SQL "LIMIT" in the query which makes the query itself NOT exhaustive. So it’s fine in terms of efficiency.
Link for similar answer below.
https://stackoverflow.com/a/6574137/4775212
0👍
If the limit is known, it can also be using range.
Message.objects.filter(chat__range=[chat_id, chat_id+n]).order_by('-id')
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