Databases as Variables: What Unlimited Databases Actually Changes

Turso Cloud has removed active-database limits from its paid plans, allowing unlimited databases that cost only for storage while idle, with the Developer plan starting at $4.99 per month and including storage and row-operation allowances. The change makes database-per-tenant, per-agent, per-experiment, per-user, and per-preview-environment architectures more practical by reducing the former cost penalty for large numbers of lightly used databases. Turso stores databases as object-storage-backed file segments rather than continuously running server processes, so idle databases require no compute resources or cold starts. Separate databases can provide isolation by construction, simplify tenant-specific backup, restoration, deletion, and compliance discussions, and permit independently tailored schemas, while provisioning can be handled through API calls, seeded templates, scoped tokens, and a routing layer. Shared schemas remain appropriate for early-stage products, similar small tenant workloads, central cross-tenant analytics, or existing well-tested row-level security systems, and hybrid models can isolate only enterprise or regulated customers. Operating many databases still requires solutions for cross-tenant analytics, fleet-wide migrations, request routing, monitoring, and storage management, while free plans remain limited to 100 databases.

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