Got most of admin panel working. Data issues fixed

OpenArchival.DataAccess/Migrations/20250828173516_AddedCascade.cs

@@ -0,0 +1,50 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace OpenArchival.DataAccess.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddedCascade : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<int>(
+                name: "ArtifactGroupingId",
+                table: "ArtifactEntries",
+                type: "integer",
+                nullable: false,
+                defaultValue: 0);
+
+            migrationBuilder.CreateIndex(
+                name: "IX_ArtifactEntries_ArtifactGroupingId",
+                table: "ArtifactEntries",
+                column: "ArtifactGroupingId");
+
+            migrationBuilder.AddForeignKey(
+                name: "FK_ArtifactEntries_ArtifactGroupings_ArtifactGroupingId",
+                table: "ArtifactEntries",
+                column: "ArtifactGroupingId",
+                principalTable: "ArtifactGroupings",
+                principalColumn: "Id",
+                onDelete: ReferentialAction.Cascade);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey(
+                name: "FK_ArtifactEntries_ArtifactGroupings_ArtifactGroupingId",
+                table: "ArtifactEntries");
+
+            migrationBuilder.DropIndex(
+                name: "IX_ArtifactEntries_ArtifactGroupingId",
+                table: "ArtifactEntries");
+
+            migrationBuilder.DropColumn(
+                name: "ArtifactGroupingId",
+                table: "ArtifactEntries");
+        }
+    }
+}