Add sharded multi-tenancy abstractions#231
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jeremydmiller merged 2 commits intomasterfrom Mar 27, 2026
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New interfaces in Weasel.Core.MultiTenancy: - ITenantDatabasePool: pool management (add/remove databases, assign tenants) - ITenantAssignmentStrategy: pluggable tenant-to-database assignment - IDatabaseSizingStrategy: pluggable "smallest database" determination - PooledDatabase: record for pool state Three built-in strategies: - HashTenantAssignment: FNV-1a hash % N for deterministic assignment - SmallestTenantAssignment: pick database with lowest tenant count - ExplicitTenantAssignment: throws for unrecognized tenants New PostgreSQL table definitions: - DatabasePoolTable (mt_database_pool): database registry with capacity - TenantAssignmentTable (mt_tenant_assignments): tenant→database mapping Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
Weasel.Core.MultiTenancy:ITenantDatabasePool,ITenantAssignmentStrategy,IDatabaseSizingStrategy,PooledDatabaseHashTenantAssignment(FNV-1a),SmallestTenantAssignment,ExplicitTenantAssignmentDatabasePoolTable(mt_database_pool),TenantAssignmentTable(mt_tenant_assignments)These abstractions enable Marten's new
ShardedTenancy(JasperFx/marten feature/sharded-tenancy) and allow Wolverine/CritterWatch to manage tenants without depending on Marten directly.Test plan
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