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Working on multitenant SaaS projects taught me one clear rule. Data isolation is not optional. It’s the backbone of security, trust, and scalability.
A few approaches
schema-per-tenant – each tenant gets its own schema. Great isolation, easy backups, more maintenance.
row-level security (RLS) – single schema, RLS per tenant. Efficient, less overhead, requires careful setup.
database-per-tenant – strongest isolation, easy to scale independently, expensive for many tenants.
Most SaaS products use RLS for standard tenants and separate schemas or databases for premium or high-risk clients.
The key is consistency. Always enforce tenant checks at the database layer, never rely only on app logic.
How do you handle data isolation in your multitenant projects?
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