Topic
Security requirement in multi-tenant software that keeps one customer's data from being read or altered by another, enforced via scoping or RLS.
PostgreSQL 18.3 handed a serving role with no grant at all on three tenant tables their exact owner and FORCE flags, in a dev.to author's test of three roles. The result gives an RLS setup check a third answer, UNDETERMINED, in cases where it would otherwise return a false nothing to report.
Reality
The screenshots show Instinct abandoning a $574 Gerber claim and drafting an incident report about a document the user says was not his. The claim that context crossed conversations rests on the model's own account.
Reality
On the platform behind taabi Nexus, the model's only output is a validated rule document, and the code that dials a driver's intercom sits behind a seven-day replay, a role check and one person's approval.
Reality
A Row Level Security policy can pass Lovable's scanner, restrict itself to authenticated users, join a membership table, and still hand every order in the database to anyone who signs up. Two SQL queries find it.
Reality
Alex Smith's team pushed the joins, the identity resolution and the access-pattern design into Data 360 graphs, so an Agentforce agent can pass a tenant ID and get customer context back in one call.
Reality
A fixture seed that fails under FORCE ROW LEVEL SECURITY has one tempting repair, and after it the write path is guarded only by the read policy, for exactly as long as the statement happens to read a column.
Reality
The estimate was 30,000 to 40,000 credits per simulation, the gateway needed only three read patterns, and the store already holding tenant rows could serve all three, so tenancy became an argument every query passes.
Reality
A table owner bypasses its own policies with no superuser rights and no BYPASSRLS, and one connection string makes the owner the serving role. Tests seeded with a single tenant never notice.
Reality
A dev.to tutorial benchmarks naive multi-tenant Row-Level Security at roughly 575 times slower than no policy at all. The variable is function volatility, not schema or traffic.
Reality
A solo founder says their Cloudflare-native stack runs a multi-tenant monitoring product for about $5 a month across its first hundred customers. The bill is the finding. The 60-second cron is the caveat.
Reality