Multi-Tenant Database Isolation — RLS Security Requirement
Multi-tenant data isolation failures are the #1 cause of catastrophic B2B SaaS incidents. A single misconfigured Supabase RLS policy can expose Client A's data to Client B. Most companies discover this in production, not staging. With GDPR, POPIA, and LGPD all imposing massive fines for data leaks, this is a compliance emergency hidden inside an engineering problem.
The Developer Problem
Row Level Security (RLS) policies in Supabase/PostgreSQL are notoriously difficult to test. A policy that looks correct in development can silently fail in production under edge cases. No native testing framework exists for RLS boundary violations.
What You Must Build
These are the exact technical components regulators will check for:
Automated cross-tenant query injection tests in staging CI/CD
RLS policy boundary verification before every production deploy
Compliance audit log proving tenant isolation was verified on each deploy
Automated alerting if RLS policies are modified without security review
Consequences of Non-Compliance
Instant loss of all enterprise customers if a breach is discovered
GDPR fine up to €20M, POPIA fine up to R10M
Press coverage — 'SaaS company exposed customer data' headlines destroy companies
Legal liability from affected enterprise customers
Drop-In Code Solution
Instead of building this from scratch (2–6 weeks of engineering time), use this production-ready package that implements all the required components above.
An automated test suite for Supabase and Prisma that runs chaotic boundary injection tests in staging — intentionally trying every known RLS bypass technique to verify cross-tenant data isolation is mathematically impossible before deployment.
// rls-tester.config.ts
import { RLSTester } from './rls-tester'
const tester = new RLSTester({
supabaseUrl: process.env.SUPABASE_URL!,
serviceKey: process.env.SUPABASE_SERVICE_KEY!,
tenants: ['tenant_a_id', 'tenant_b_id', 'tenant_c_id'],
tables: ['documents', 'invoices', 'user_profiles'],
attacks: ['tenant_escalation', 'null_rls', 'jwt_tampering'],
outputReport: 'compliance-audit-log.json' // hand to auditors
})
// Run in CI before every deploy
await tester.runAll() // throws if any isolation failure found