Architecture
•Sep 02, 2026•6 min readMulti-Tenant Isolation in Lakebase Postgres and Next.js App Router
Designing zero-leakage database tenancy with Row-Level Security, connection pooling, and tenant-aware middleware.
Hamza Tariq
Core Systems Engineer at Ziilink AI
The Threat Model of Multi-Tenant SaaS
In multi-tenant SaaS architectures, software bugs must never result in cross-tenant data leakage. Relying strictly on application-layer `WHERE tenant_id = x` clauses is a recipe for catastrophic breaches.
Postgres Row Level Security (RLS)
By enforcing tenant boundaries in the PostgreSQL engine via RLS policies, even an improperly formatted raw query cannot access records outside the current transaction's tenant context.
Tags:#Postgres#Security#SaaS#Next.js#Lakebase
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