Nullability of reference types in type of parameter 'query' of 'Task<long> QueryGenericRepository<T>.GetCountAsync(Expression<Func<T, bool>> query = null)' doesn't match implicitly implemented member 'Task<long> IQueryGenericRepository<T>.GetCountAsync(Expression<Func<T, bool>>? query = null)' (possibly because of nullability attributes).

Cannot convert null literal to non-nullable reference type.

Nullability of reference types in type of parameter 'sender' of 'void CommandContext.TrackChanges(object sender, EntityEntryEventArgs e)' doesn't match the target delegate 'EventHandler<EntityStateChangedEventArgs>' (possibly because of nullability attributes).

Nullability of reference types in type of parameter 'sender' of 'void CommandContext.TrackChanges(object sender, EntityEntryEventArgs e)' doesn't match the target delegate 'EventHandler<EntityTrackedEventArgs>' (possibly because of nullability attributes).

Non-nullable property 'OldValue' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'NewValue' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'RelatedEntityId' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'RelatedEntityType' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.