Tenant isolation is part product decision, part compliance story. Many B2B tools start shared-schema with a `tenant_id` and strong row-level discipline.
Schema-per-tenant raises operational overhead but can help noisy-neighbor containment and regulated clients.
Migrations must be boring at scale. Automate rollout and rollback testing; tenants will not forgive downtime for a bad column default.
Backup and restore stories differ per pattern—design DR with your legal and sales promises in mind.
