Multi-tenant SaaS rarely starts with perfect isolation. It starts with a shared database and a hope that customers will grow evenly. When they do not, the first instinct is a dramatic rewrite. Most teams do not need that drama yet.
Look for seams you already have: per-tenant rate limits at the edge, separate worker pools for heavy exports, and read replicas reserved for analytics tenants. Each seam reduces blast radius without relocating every row.
Document the fairness contract in plain language—what one tenant can consume before others are protected. Engineers implement clearer rules when product and support agree on the contract before code lands.
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