async only to allow special value generators, such as the one used by 'Microsoft.EntityFrameworkCore.Metadata.SqlServerValueGenerationStrategy.SequenceHiLo', to access the database asynchronously. For all other cases the non async method should be used.
not sure but its giving me the same error when i change to synchronous
changing from AddAsync to Add is not for solving thins specific error it's just for Add itself
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