Introduces a new `StateHistory` property in the `PObject` class within `PObject.cs`. This property is decorated with the `[ForeignKey("ObjStateId")]` attribute and is of type `IEnumerable<PObjectStateHist>?`, allowing it to store a collection of `PObjectStateHist` objects. It is initialized to an empty array using `Array.Empty<PObjectStateHist>()`.
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