On a platform that hosts many stores, security isn't a feature you add — it's the foundation everything else stands on. If isolation fails, nothing else matters.
Enforce, don't hope
CIQRA scopes every tenant table with PostgreSQL row-level security, keyed to the resolved tenant. The database refuses to return another store's rows, even if application code slips.
Prove it continuously
A cross-tenant leak-test suite runs on every change and blocks any merge that could break isolation. We treat "your data can't reach another store" as something to verify, not assume.
Trust you can point to
EU data residency, field-level encryption and a published subprocessor list round it out. Security shouldn't be a paid tier — it should be the default. See Security.