Got the new ui flow working and the models updated. Need to get changes written to the database.

OpenArchival.DataAccess/Models/ArtifactGrouping.cs

@@ -0,0 +1,75 @@
+using System.ComponentModel.DataAnnotations;
+using System.Diagnostics.CodeAnalysis;
+
+namespace OpenArchival.DataAccess;
+
+public class ArtifactGrouping
+{
+    [Key]
+    public required int Id { get; set; }
+
+    public string? ArtifactGroupingIdentifier 
+    { 
+        get
+        {
+            return ModelHelpers.MakeIdentifier(_identifierFields.Values, Category.FieldSeparator, null);
+        }
+    }
+
+    public required ArchiveCategory Category { get; set; }
+
+    private IdentifierFields _identifierFields;
+    public required IdentifierFields IdentifierFields {
+        get => _identifierFields;
+        set
+        {
+            if (value.Values.Count != Category.FieldNames.Count)
+            {
+                throw new ArgumentException(nameof(IdentifierFields), $"The number of field values must be equal to the field count of the {nameof(ArchiveCategory)}");
+            }
+
+            _identifierFields = value; 
+        }
+    }
+
+    public required List<ArtifactEntry> ChildArtifactEntries { get; set; } = new();
+
+    public required string Title { get; set; }
+
+    public string? Description { get; set; }
+
+    public string? Type { get; set; }
+
+    public List<ArtifactGrouping>? RelatedArtifactGroupings { get; set; }
+    
+    public bool IsPublicallyVisible { get; set; }
+
+    public IEnumerable<ArtifactEntryTag> ChildTags
+    {
+        get
+        {
+            HashSet<ArtifactEntryTag> seenTags = [];
+            for (int index = 0; index < ChildArtifactEntries.Count; ++index)
+            {
+                // Get the tags for this entry, skip if no tags 
+                List<ArtifactEntryTag>? tags = ChildArtifactEntries[index].Tags;
+                if (tags is null)
+                {
+                    continue;
+                }
+                
+                // Only yield a tag if we have not yielded it yet
+                foreach (ArtifactEntryTag tag in tags)
+                {
+                    if (seenTags.Contains(tag))
+                    {
+                        continue;
+                    }
+
+                    seenTags.Add(tag);
+                    yield return tag;
+                }
+            }
+        }
+    }
+}