SaaS Multi-Tenancy Architecture: Selecting the Right Database Strategy
Evaluating shared database / shared schema vs. separate database architectures for scaling modern B2B SaaS platforms.
The Core Multi-Tenancy Trade-Off
When designing a B2B SaaS application, data isolation is paramount. Developers must choose between tenant isolation approaches: single database with tenant_id foreign keys, separate schemas per tenant, or completely isolated database instances.
PostgreSQL Row Level Security (RLS) can pair a single database with database-enforced row policies that help maintain tenant data boundaries when correctly configured and tested.
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