When would you use global query filters in EF Core, and what risks do they introduce?

Global query filters in EF Core

Explains global query filters in EF Core with practical .NET data-access examples and production trade-offs.

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Global query filters automatically apply a filter to queries for an entity type. They are often used for soft delete or tenant filtering. For example, the application can exclude IsDeleted rows from normal queries. They are useful because developers do not need to remember the same filter everywhere.

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Understanding of global query filters in EF Core, EF Core/SQL behavior, API boundaries, production risks, and practical debugging or design judgment.

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Explain global query filters in EF Core with practical .NET data-access examples and production trade-offs. It matters in real backend work because query shape, indexes, transactions, locking, and data volume can turn harmless-looking code into a production bottleneck. The practical angle is global query filters in EF Core, EF Core/SQL behavior, API boundaries, production risks, and practical debugging or design judgment, tied to a concrete production decision.
Global query filters automatically apply a filter to queries for an entity type. They are often used for soft delete or tenant filtering. For example, the application can exclude IsDeleted rows from normal queries. They are useful because developers do not need to remember the same filter everywhere.
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Global filters reduce repeated code, but they can also hide behavior. A developer may wonder why a row is missing because the filter is applied automatically. The trade-off is consistency versus visibility. I use them for cross-cutting rules like tenant isolation or soft delete, but I document them, test them, and review any use of carefully.

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Treating global query filters in EF Core as a syntax detail instead of a production behavior.
Not checking generated SQL, query plans, or actual data volume.
Testing only with tiny local data and assuming production will behave the same.
Fixing symptoms with caching, timeouts, or retries before understanding the data-access cause.

When would you use global query filters in EF Core, and what risks do they introduce?

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