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Sharded Tenant Placement Ignoring Data Locality and Compliance : Isolation Guarantees Enforced by Structure, Not Convention

RustOR-ToolsPostgreSQLCitus

Problem Breakdown

The systemic defect is that tenant isolation depends on developer discipline : prefixes, middleware calls, policy conventions : when it must depend on structure that makes violations impossible to express. Tenant-to-shard placement uses round-robin or hash placement; it ignores data-residency requirements (EU tenants m…

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