Row Level Security Is Your Armor

In a multi-tenant SaaS application, keeping client data strictly isolated is your highest engineering priority. Rather than relying entirely on complex middleware queries, we enforce data security at the database layer using Row Level Security (RLS).

Pattern 1: Tenant-Based Isolation

Enforce database checks that match the logged-in user's custom claims against the specific workspace ID on the target row.

auth.uid() = user_id

Pattern 2: Team Workspaces and Collaboration

For apps where multiple users share a workspace, we write JOIN helper policies that verify membership before granting write access.

Define a membership junction table.
Query the user's membership status directly inside the RLS policy.
Maintain clean write permissions without duplicating safety code across your API endpoints.

Secure your database at the source, and build with absolute confidence!