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Polecat Brings Document Storage and Wolverine Messaging to SQL Server 2025

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A .NET team documented a production spike migrating to Polecat, a document database library that runs on Microsoft SQL Server 2025. Native binary JSON support in SQL Server 2025 made it practical to run a high-performance document store on the platform, which many enterprises require. The spike found the Aspire host and Wolverine outbox worked with minimal friction, while LINQ predicates, FastEndpoints scope disposal, and batch queries needed refactoring. Polecat's LINQ parser is stricter than Marten's, requiring direct member-to-constant comparisons, and it supports only asynchronous enumeration and disposal. The authors provide workarounds, such as switching to async scopes and avoiding interface-constrained filters.

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