Update schema and migration to allow LastLoginDate and LastActivityDate to be null

Jellyfin.Server.Implementations/Migrations/20200529171409_AddUsers.Designer.cs

@@ -1,6 +1,4 @@
-#pragma warning disable CS1591
-
-// <auto-generated />
+// <auto-generated />
 using System;
 using Jellyfin.Server.Implementations;
 using Microsoft.EntityFrameworkCore;
@@ -11,7 +9,7 @@ using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
 namespace Jellyfin.Server.Implementations.Migrations
 {
     [DbContext(typeof(JellyfinDb))]
-    [Migration("20200527010628_AddUsers")]
+    [Migration("20200529171409_AddUsers")]
     partial class AddUsers
     {
         protected override void BuildTargetModel(ModelBuilder modelBuilder)
@@ -281,10 +279,10 @@ namespace Jellyfin.Server.Implementations.Migrations
                     b.Property<int>("InvalidLoginAttemptCount")
                         .HasColumnType("INTEGER");
 
-                    b.Property<DateTime>("LastActivityDate")
+                    b.Property<DateTime?>("LastActivityDate")
                         .HasColumnType("TEXT");
 
-                    b.Property<DateTime>("LastLoginDate")
+                    b.Property<DateTime?>("LastLoginDate")
                         .HasColumnType("TEXT");
 
                     b.Property<int?>("LoginAttemptsBeforeLockout")

Jellyfin.Server.Implementations/Migrations/20200529171409_AddUsers.cs

@@ -1,7 +1,4 @@
-#pragma warning disable CS1591
-#pragma warning disable SA1601
-
-using System;
+using System;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 namespace Jellyfin.Server.Implementations.Migrations
@@ -39,8 +36,8 @@ namespace Jellyfin.Server.Implementations.Migrations
                     AuthenticationProviderId = table.Column<string>(maxLength: 255, nullable: false),
                     PasswordResetProviderId = table.Column<string>(maxLength: 255, nullable: false),
                     InvalidLoginAttemptCount = table.Column<int>(nullable: false),
-                    LastActivityDate = table.Column<DateTime>(nullable: false),
-                    LastLoginDate = table.Column<DateTime>(nullable: false),
+                    LastActivityDate = table.Column<DateTime>(nullable: true),
+                    LastLoginDate = table.Column<DateTime>(nullable: true),
                     LoginAttemptsBeforeLockout = table.Column<int>(nullable: true),
                     SubtitleMode = table.Column<int>(nullable: false),
                     PlayDefaultAudioTrack = table.Column<bool>(nullable: false),

Jellyfin.Server.Implementations/Migrations/JellyfinDbModelSnapshot.cs

@@ -277,10 +277,10 @@ namespace Jellyfin.Server.Implementations.Migrations
                     b.Property<int>("InvalidLoginAttemptCount")
                         .HasColumnType("INTEGER");
 
-                    b.Property<DateTime>("LastActivityDate")
+                    b.Property<DateTime?>("LastActivityDate")
                         .HasColumnType("TEXT");
 
-                    b.Property<DateTime>("LastLoginDate")
+                    b.Property<DateTime?>("LastLoginDate")
                         .HasColumnType("TEXT");
 
                     b.Property<int?>("LoginAttemptsBeforeLockout")