# Tenant Isolation | EternalEngine Security

Your data is yours. PostgreSQL Row Level Security ensures zero cross-tenant leakage — enforced at the database level, not just app code.

Security & Compliance

# Your data is yours. Period.

EternalEngine enforces tenant isolation at the PostgreSQL row level — not just application code. Even if there's a bug, your data cannot leak to another tenant. Separation is architectural, not optional.

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Tenant Isolation Architecture

Tenant A

Acme Corp

tenant_id: a1b2c3

Tenant B

Globex Inc

tenant_id: d4e5f6

Every query

PostgreSQL Row Level Security

WHERE tenant_id = current_setting(

'app.current_tenant'

)

✓ Applied to EVERY row, EVERY query

PostgreSQL Database

Row a1b2c3 — visible to Tenant A only

Row a1b2c3 — visible to Tenant A only

Row d4e5f6 — visible to Tenant B only

Cross-tenant access: impossible

## Isolation enforced at every layer

EternalEngine's multi-tenancy is designed security-first — from schema to session.

### PostgreSQL RLS

Row Level Security policies are attached directly to every table. The database engine enforces tenant boundaries — no application code can bypass it, even with a bug.

### tenant_id on Every Query

Every database query automatically scopes to the authenticated tenant. The tenant_id comes from the session context set at login — never from user-controlled input.

### Cross-Tenant Access: Impossible

Even a fully-compromised API key from Tenant A cannot read Tenant B's data. The RLS policy blocks it at the storage layer — the application never even sees the wrong rows.

### Schema Isolation

Tenant configuration, custom fields, and metadata are scoped per tenant. There are no shared mutable state risks — each tenant's schema extensions are fully isolated.

## Enterprise-grade isolation, built in from day one

Designed for organizations where data security is non-negotiable.

### Enterprise-Grade Isolation

The same pattern used by enterprise SaaS leaders — enforced at the database engine, not just application middleware. Auditors understand it. Your InfoSec team will approve it.

### Compliance-Ready

PostgreSQL RLS satisfies data segregation requirements for SOC 2, ISO 27001, and GDPR. Evidence of isolation is demonstrable and auditable — not a promise.

### Zero Data Leakage

No application bug, misconfigured join, or developer mistake can expose one tenant's data to another. The constraint is structural, not procedural.

Questions

## Common questions, straight answers.

### Keep exploring

- [All security features](https://eternalengineos.io/features/security-compliance/)
- [Data encryption](https://eternalengineos.io/features/security-compliance/data-encryption/)
- [JWT authentication](https://eternalengineos.io/features/security-compliance/jwt-authentication/)
- [Plans and pricingFree to start; every paid plan has a 30-day free trial.](https://eternalengineos.io/pricing/)

What does tenant isolation mean here?

Every row of your data carries your tenant id and the database itself refuses to return rows for any other tenant, whatever the application asks.

Where does the tenant come from?

From your authenticated session, never from a URL, form field or header, so a request cannot claim to be another account.

Is it tested?

Yes. Cross-tenant tests run in CI against a real database on every change to prove one tenant cannot read or write another’s rows.

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