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In a Clean architecture project, the repository pattern is used to abstract away the persistence layer from the business logic layer. To change the implementation details of a database at runtime, we can do the following:

1. Use an interface to define the repository's behavior: First, we need to define an interface that defines the behavior of the repository. For example, we can define an interface called IUserRepository that contains methods for CRUD operations on user entities.

2. Implement the repository using a specific database provider: Next, we need to create concrete implementations of the IUserRepository interface for each database provider that we want to support. For example, we can create a SqlUserRepository implementation that uses SQL Server as its database provider.

3. Use dependency injection to inject the appropriate implementation: Once the interface and its implementations are defined, we can use dependency injection (DI) to inject the appropriate implementation based on the runtime configuration. For example, we can use a DI container like Microsoft.Extensions.DependencyInjection to configure the application to use the SqlUserRepository implementation when the application starts up.

4. Update the configuration at runtime: Finally, to change the implementation details of the database at runtime, we can update the DI container configuration based on user input or some other mechanism. For example, we can provide a user interface that allows the user to select a different database provider and update the DI container configuration accordingly.

Using this approach, we can easily switch database providers at runtime without changing the business logic layer of the application.