Fix migration issue #3865 (#3872)

src/NuGetGallery.Core/Entities/UserSecurityPolicy.cs

@@ -38,6 +38,7 @@ public UserSecurityPolicy(string name)
         /// Type name for the policy handler that provides policy behavior.
         /// </summary>
         [Required]
+        [StringLength(256)]
         public string Name { get; set; }
 
         /// <summary>

src/NuGetGallery/Migrations/201705032101231_SecurityPoliciesFix.cs

@@ -0,0 +1,44 @@
+namespace NuGetGallery.Migrations
+{
+    using System;
+    using System.Data.Entity.Migrations;
+
+    public partial class SecurityPoliciesFix : DbMigration
+    {
+        public override void Up()
+        {
+            DropUserSecurityPoliciesIfExists();
+
+            CreateTable(
+                "dbo.UserSecurityPolicies",
+                c => new
+                    {
+                        Key = c.Int(nullable: false, identity: true),
+                        UserKey = c.Int(nullable: false),
+                        Name = c.String(nullable: false, maxLength: 256),
+                        Value = c.String(),
+                    })
+                .PrimaryKey(t => t.Key)
+                .ForeignKey("dbo.Users", t => t.UserKey, cascadeDelete: true)
+                .Index(t => t.UserKey);
+
+        }
+
+        public override void Down()
+        {
+            DropForeignKey("dbo.UserSecurityPolicies", "UserKey", "dbo.Users");
+            DropIndex("dbo.UserSecurityPolicies", new[] { "UserKey" });
+            DropTable("dbo.UserSecurityPolicies");
+        }
+
+        private void DropUserSecurityPoliciesIfExists()
+        {
+            try
+            {
+                DropForeignKey("dbo.UserSecurityPolicies", "UserKey", "dbo.Users");
+                DropTable("dbo.UserSecurityPolicies");
+            }
+            catch (Exception) { }
+        }
+    }
+}