Small project design

Hello I have got a typical project project
vendors<->clients<->invoice<-> product
and I would like to use the best design for better performance

a) one or many vendros can access one client

c) a client has one or many invoice

d) invoice reffer to product

I am a little bit afraid by performance for retrieving information

I was thinking on creating cross references


Vendor
- name
- client list

Client
- name
- vendor list
- invoice list

Invoice
- Number
- ?Client ref?

what do you think of that structure ?

Regards

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