The error was:

> use of ‘@import’ in framework header is discouraged, including this header requires -fmodules

This commit applies the fix recommended at https://developer.apple.com/documentation/xcode/identifying-and-addressing-framework-module-issues

DatabaseAggregate does not support isolated conformances: it must be able to aggregate values whenever a database access is performed. This can happen in a nonisolated fashion.

ValueReducer does not support isolated conformances: it must be able to reduce observed values when needed. This can happen in a nonisolated fashion.

This is required because the value of databaseSelection is not required to be Sendable. This forces TableRecord.relationForAll to postpone the definition of the selection until we access the database - in a nonisolated fashion.

This allows us to apply the encoding strategies for Data, Date, UUID when we know we need it, i.e. when we know the primary key, and this happens when we access the database - in a nonisolated fashion.

In the iOS 26 simulator the demo app would show a flash of missing content.