Design a scalable multi-tenant SaaS database for 50,000 tenants.

Shared Schema + RLS pattern for scale Every table: tenant_id UUID NOT NULL with composite indexes (tenant_id, ...) tenants(id UUID PK, plan VARCHAR, created_at, max_users INT) Row-Level Security: CREATE POLICY ... USING (tenant_id = current_setting('app.tenant')::UUID) Application: SET LOCAL app.tenant = ? on every connection checkout Partitioning: PARTITION BY HASH (tenant_id) for large tables Se