Ah, got it working!

daiplusplus · daiplusplus · commit 3b5a857c6563 · 2018-06-14T01:26:54.000-07:00
diff --git a/EntityFramework.Reverse.POCO.Generator/EF.Reverse.POCO.Core.ttinclude b/EntityFramework.Reverse.POCO.Generator/EF.Reverse.POCO.Core.ttinclude
@@ -1069,8 +1069,9 @@
                 : "System.ComponentModel.DataAnnotations.Schema.";
 
             bool isNewSequentialId = !string.IsNullOrEmpty(Default)  && Default.ToLower().Contains("newsequentialid");
+            bool isTemporalColumn = this.GeneratedAlwaysType != ColumnGeneratedAlwaysType.NotApplicable; 
 
-            if (IsIdentity || isNewSequentialId)
+            if (IsIdentity || isNewSequentialId || isTemporalColumn) // Identity, instead of Computed, seems the best for Temporal `GENERATED ALWAYS` columns: https://stackoverflow.com/questions/40742142/entity-framework-not-working-with-temporal-table
             {
                 if(Settings.UseDataAnnotations || isNewSequentialId)
                     DataAnnotations.Add("DatabaseGenerated(DatabaseGeneratedOption.Identity)");

Original file line number	Diff line number	Diff line change
`@@ -1069,8 +1069,9 @@`
`1069`	`1069`	`: "System.ComponentModel.DataAnnotations.Schema.";`
`1070`	`1070`
`1071`	`1071`	`bool isNewSequentialId = !string.IsNullOrEmpty(Default) && Default.ToLower().Contains("newsequentialid");`
	`1072`	`+ bool isTemporalColumn = this.GeneratedAlwaysType != ColumnGeneratedAlwaysType.NotApplicable;`
`1072`	`1073`
`1073`		`- if (IsIdentity \|\| isNewSequentialId)`
	`1074`	+ if (IsIdentity \|\| isNewSequentialId \|\| isTemporalColumn) // Identity, instead of Computed, seems the best for Temporal `GENERATED ALWAYS` columns: https://stackoverflow.com/questions/40742142/entity-framework-not-working-with-temporal-table
`1074`	`1075`	`{`
`1075`	`1076`	`if(Settings.UseDataAnnotations \|\| isNewSequentialId)`
`1076`	`1077`	`DataAnnotations.Add("DatabaseGenerated(DatabaseGeneratedOption.Identity)");`