django-multitenant (via) Absolutely fascinating Django library for horizontally sharding a database using a multi-tenant pattern, from the team at Citus. In this pattern every relevant table includes a “tenant_id”, and all queries should specifically select against that ID. Once you have that in place, you can shard your rows across multiple different databases and route to the correct database based on the tenant ID, safe in the knowledge that joins will still work provided they are against other rows belonging to the same tenant.
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