Working on multitenant SaaS projects taught me one clear rule. Data isolation is not optional. It...Working on multitenant SaaS projects taught me one clear rule. Data isolation is not optional. It...
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Daniil Novikov
pro
• Dec 24
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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