Prevent tenant data leakage at the database layer

Safe Boundary enforces row-level security per tenant, per query, in real time — at the proxy layer, not inside PostgreSQL. Same isolation guarantees. No RLS performance penalty. Automatic injection of missing tenant conditions.

Stack diagram — SaaS app (multi-tenant auth) → Safe Boundary proxy (tenant injection) → PostgreSQL

Spectral Core — Established 2004 · Microsoft Partner · Google Partner · ISO 27001 Certified

Tenant isolation is the hardest problem in multi-tenant SaaS

One tenant seeing another's data is a company-ending event. It almost never happens because of a malicious actor — it happens because a developer forgot WHERE tenant_id = ?, or an AI agent generated SQL without tenant context, or a new engineer missed the convention.

PostgreSQL's native RLS is the right concept but painful at production scale — sequential scans, 11x+ degradation, timeouts on multi-table joins. Teams disable RLS and trust the app layer — where leaks happen.

-- RLS in dev looks fine; in prod it evaluates per row:
CREATE POLICY tenant_isolation ON orders
  USING (tenant_id = current_setting('app.tenant_id')::uuid);

How Safe Boundary enforces tenant isolation

Proxy-layer RLS

Safe Boundary injects the tenant condition before PostgreSQL. The planner sees a normal WHERE and uses indexes.

-- Application or AI agent sends:
SELECT * FROM orders WHERE status = 'pending'

-- Safe Boundary rewrites to:
SELECT * FROM orders
WHERE status = 'pending'
AND tenant_id = '8f3a2c91-...'    -- from authenticated session

Missing tenant condition detection

Query touches a multi-tenant table but has no tenant filter? Choose: auto-inject, block with a clear error, or alert (audit-only rollout).

Missing index detection

Inspect plans for tenant-scoped queries; get the exact CREATE INDEX before production pain.

Benchmark

Scenario	PostgreSQL native RLS	Safe Boundary proxy RLS
1M rows, tenant filter	340 ms	28 ms
10M rows, 1,000 tenants	Timeout	31 ms
3-table join, RLS on all	Timeout	44 ms

Internal benchmarks. Hardware: 4 vCPU / 16 GB RAM PostgreSQL 16. Results vary by query complexity and data distribution.

Safe Boundary is the rare security product that makes your database faster.

AI agents and multi-tenancy

An LLM that gets tenant scope right 99% of the time will eventually emit an unscoped query. Safe Boundary enforces deterministically at the database — every query, every time.

First-class AI agent identity

Named agents with scoped policies — example configuration:

agent: recommendation-engine
allowed_tables:
  - products (SELECT)
  - order_history (SELECT)
  - users (SELECT: id, tier)
tenant_scope: enforced
max_rows_per_query: 500

Violations: blocked. Allowed queries: full audit — agent, tenant, outcome.

Pricing for Multi-Tenant SaaS

	Shield	Pro	Enterprise
Price	$149/db/mo	$499/db/mo ($4,490/db/yr)	$899/db/mo ($8,490/db/yr)
Tenant isolation	Block-only	✓ Proxy RLS	✓ Proxy RLS
Tenant condition auto-inject	—	✓	✓
Missing index detection	—	✓	✓
AI agent identity	—	✓	✓
VPC deployment	—	✓	✓
SOC 2 evidence	—	—	✓

Start path: Shield for SQL injection blocking. Pro for proxy-layer RLS and tenant enforcement. Enterprise for 10+ databases or SOC 2. Expansion revenue follows tenant and database growth.

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