diff --git a/MareSynchronosServer/MareSynchronosServer/Hubs/FilesHub.cs b/MareSynchronosServer/MareSynchronosServer/Hubs/FilesHub.cs
index d37981a..d7dd180 100644
--- a/MareSynchronosServer/MareSynchronosServer/Hubs/FilesHub.cs
+++ b/MareSynchronosServer/MareSynchronosServer/Hubs/FilesHub.cs
@@ -158,7 +158,6 @@ namespace MareSynchronosServer.Hubs
                 await DbContext.Files.AddAsync(new FileCache()
                 {
                     Hash = file,
-                    LastAccessTime = DateTime.Now,
                     Uploaded = false,
                     Uploader = DbContext.Users.Single(u => u.UID == userId)
                 });
@@ -225,7 +224,6 @@ namespace MareSynchronosServer.Hubs
                 await File.WriteAllBytesAsync(Path.Combine(BasePath, hash), uploadedFile.ToArray());
                 relatedFile = DbContext.Files.Single(f => f.Hash == hash);
                 relatedFile.Uploaded = true;
-                relatedFile.LastAccessTime = DateTime.Now;
                 await DbContext.SaveChangesAsync();
                 Logger.LogInformation("File " + hash + " added to DB");
             }
diff --git a/MareSynchronosServer/MareSynchronosServer/Migrations/20220712082237_SetMaxLengths.Designer.cs b/MareSynchronosServer/MareSynchronosServer/Migrations/20220712082237_SetMaxLengths.Designer.cs
new file mode 100644
index 0000000..4a89585
--- /dev/null
+++ b/MareSynchronosServer/MareSynchronosServer/Migrations/20220712082237_SetMaxLengths.Designer.cs
@@ -0,0 +1,175 @@
+// <auto-generated />
+using System;
+using MareSynchronosServer.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+
+#nullable disable
+
+namespace MareSynchronosServer.Migrations
+{
+    [DbContext(typeof(MareDbContext))]
+    [Migration("20220712082237_SetMaxLengths")]
+    partial class SetMaxLengths
+    {
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "6.0.6")
+                .HasAnnotation("Relational:MaxIdentifierLength", 128);
+
+            SqlServerModelBuilderExtensions.UseIdentityColumns(modelBuilder, 1L, 1);
+
+            modelBuilder.Entity("MareSynchronosServer.Models.Banned", b =>
+                {
+                    b.Property<string>("CharacterIdentification")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("Reason")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<byte[]>("Timestamp")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("rowversion");
+
+                    b.HasKey("CharacterIdentification");
+
+                    b.ToTable("BannedUsers", (string)null);
+                });
+
+            modelBuilder.Entity("MareSynchronosServer.Models.ClientPair", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    SqlServerPropertyBuilderExtensions.UseIdentityColumn(b.Property<int>("Id"), 1L, 1);
+
+                    b.Property<bool>("AllowReceivingMessages")
+                        .HasColumnType("bit");
+
+                    b.Property<bool>("IsPaused")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("OtherUserUID")
+                        .HasColumnType("nvarchar(10)");
+
+                    b.Property<byte[]>("Timestamp")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("rowversion");
+
+                    b.Property<string>("UserUID")
+                        .HasColumnType("nvarchar(10)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("OtherUserUID");
+
+                    b.HasIndex("UserUID");
+
+                    b.ToTable("ClientPairs", (string)null);
+                });
+
+            modelBuilder.Entity("MareSynchronosServer.Models.FileCache", b =>
+                {
+                    b.Property<string>("Hash")
+                        .HasMaxLength(20)
+                        .HasColumnType("nvarchar(40)");
+
+                    b.Property<byte[]>("Timestamp")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("rowversion");
+
+                    b.Property<bool>("Uploaded")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("UploaderUID")
+                        .HasColumnType("nvarchar(10)");
+
+                    b.HasKey("Hash");
+
+                    b.HasIndex("UploaderUID");
+
+                    b.ToTable("FileCaches", (string)null);
+                });
+
+            modelBuilder.Entity("MareSynchronosServer.Models.ForbiddenUploadEntry", b =>
+                {
+                    b.Property<string>("Hash")
+                        .HasColumnType("nvarchar(450)");
+
+                    b.Property<string>("ForbiddenBy")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<byte[]>("Timestamp")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("rowversion");
+
+                    b.HasKey("Hash");
+
+                    b.ToTable("ForbiddenUploadEntries", (string)null);
+                });
+
+            modelBuilder.Entity("MareSynchronosServer.Models.User", b =>
+                {
+                    b.Property<string>("UID")
+                        .HasMaxLength(10)
+                        .HasColumnType("nvarchar(10)");
+
+                    b.Property<string>("CharacterIdentification")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<bool>("IsAdmin")
+                        .HasColumnType("bit");
+
+                    b.Property<bool>("IsModerator")
+                        .HasColumnType("bit");
+
+                    b.Property<string>("SecretKey")
+                        .HasColumnType("nvarchar(max)");
+
+                    b.Property<byte[]>("Timestamp")
+                        .IsConcurrencyToken()
+                        .ValueGeneratedOnAddOrUpdate()
+                        .HasColumnType("rowversion");
+
+                    b.HasKey("UID");
+
+                    b.ToTable("Users", (string)null);
+                });
+
+            modelBuilder.Entity("MareSynchronosServer.Models.ClientPair", b =>
+                {
+                    b.HasOne("MareSynchronosServer.Models.User", "OtherUser")
+                        .WithMany()
+                        .HasForeignKey("OtherUserUID");
+
+                    b.HasOne("MareSynchronosServer.Models.User", "User")
+                        .WithMany()
+                        .HasForeignKey("UserUID");
+
+                    b.Navigation("OtherUser");
+
+                    b.Navigation("User");
+                });
+
+            modelBuilder.Entity("MareSynchronosServer.Models.FileCache", b =>
+                {
+                    b.HasOne("MareSynchronosServer.Models.User", "Uploader")
+                        .WithMany()
+                        .HasForeignKey("UploaderUID");
+
+                    b.Navigation("Uploader");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/MareSynchronosServer/MareSynchronosServer/Migrations/20220712082237_SetMaxLengths.cs b/MareSynchronosServer/MareSynchronosServer/Migrations/20220712082237_SetMaxLengths.cs
new file mode 100644
index 0000000..fc8c77a
--- /dev/null
+++ b/MareSynchronosServer/MareSynchronosServer/Migrations/20220712082237_SetMaxLengths.cs
@@ -0,0 +1,141 @@
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace MareSynchronosServer.Migrations
+{
+    public partial class SetMaxLengths : Migration
+    {
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "LastAccessTime",
+                table: "FileCaches");
+
+            migrationBuilder.DropForeignKey("FK_FileCaches_Users_UploaderUID", "FileCaches");
+            migrationBuilder.DropForeignKey("FK_ClientPairs_Users_UserUID", "ClientPairs");
+            migrationBuilder.DropForeignKey("FK_ClientPairs_Users_OtherUserUID", "ClientPairs");
+            migrationBuilder.DropPrimaryKey("PK_FileCaches", "FileCaches");
+            migrationBuilder.DropPrimaryKey("PK_Users", "Users");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "UploaderUID",
+                table: "FileCaches",
+                type: "nvarchar(10)",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(450)",
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Hash",
+                table: "FileCaches",
+                type: "nvarchar(40)",
+                maxLength: 20,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(450)");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "UserUID",
+                table: "ClientPairs",
+                type: "nvarchar(10)",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(450)",
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "OtherUserUID",
+                table: "ClientPairs",
+                type: "nvarchar(10)",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(450)",
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "UID",
+                table: "Users",
+                type: "nvarchar(10)",
+                maxLength: 10,
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(450)");
+
+            migrationBuilder.AddPrimaryKey("PK_Users", "Users", "UID");
+            migrationBuilder.AddPrimaryKey("PK_FileCaches", "FileCaches", "Hash");
+            migrationBuilder.AddForeignKey("FK_FileCaches_Users_UploaderUID", "FileCaches", "UploaderUID", "Users");
+            migrationBuilder.AddForeignKey("FK_ClientPairs_Users_UserUID", "ClientPairs", "UserUID", "Users");
+            migrationBuilder.AddForeignKey("FK_ClientPairs_Users_OtherUserUID", "ClientPairs", "UserUID", "Users");
+        }
+
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropForeignKey("FK_FileCaches_Users_UploaderUID", "FileCaches");
+            migrationBuilder.DropForeignKey("FK_ClientPairs_Users_UserUID", "ClientPairs");
+            migrationBuilder.DropForeignKey("FK_ClientPairs_Users_OtherUserUID", "ClientPairs");
+            migrationBuilder.DropPrimaryKey("PK_FileCaches", "FileCaches");
+            migrationBuilder.DropPrimaryKey("PK_Users", "Users");
+
+            migrationBuilder.AlterColumn<string>(
+                name: "UID",
+                table: "Users",
+                type: "nvarchar(450)",
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(10)",
+                oldMaxLength: 10);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "UploaderUID",
+                table: "FileCaches",
+                type: "nvarchar(450)",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(10)",
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "Hash",
+                table: "FileCaches",
+                type: "nvarchar(450)",
+                nullable: false,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(20)",
+                oldMaxLength: 20);
+
+            migrationBuilder.AddColumn<DateTime>(
+                name: "LastAccessTime",
+                table: "FileCaches",
+                type: "datetime2",
+                nullable: false,
+                defaultValue: new DateTime(1, 1, 1, 0, 0, 0, 0, DateTimeKind.Unspecified));
+
+            migrationBuilder.AlterColumn<string>(
+                name: "UserUID",
+                table: "ClientPairs",
+                type: "nvarchar(450)",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(10)",
+                oldNullable: true);
+
+            migrationBuilder.AlterColumn<string>(
+                name: "OtherUserUID",
+                table: "ClientPairs",
+                type: "nvarchar(450)",
+                nullable: true,
+                oldClrType: typeof(string),
+                oldType: "nvarchar(10)",
+                oldNullable: true);
+
+            migrationBuilder.AddPrimaryKey("PK_Users", "Users", "UID");
+            migrationBuilder.AddPrimaryKey("PK_FileCaches", "FileCaches", "Hash");
+            migrationBuilder.AddForeignKey("FK_FileCaches_Users_UploaderUID", "FileCaches", "UploaderUID", "Users");
+            migrationBuilder.AddForeignKey("FK_ClientPairs_Users_UserUID", "ClientPairs", "UserUID", "Users");
+            migrationBuilder.AddForeignKey("FK_ClientPairs_Users_OtherUserUID", "ClientPairs", "UserUID", "Users");
+        }
+    }
+}
diff --git a/MareSynchronosServer/MareSynchronosServer/Migrations/MareDbContextModelSnapshot.cs b/MareSynchronosServer/MareSynchronosServer/Migrations/MareDbContextModelSnapshot.cs
index ebc28e7..bfcf123 100644
--- a/MareSynchronosServer/MareSynchronosServer/Migrations/MareDbContextModelSnapshot.cs
+++ b/MareSynchronosServer/MareSynchronosServer/Migrations/MareDbContextModelSnapshot.cs
@@ -55,7 +55,7 @@ namespace MareSynchronosServer.Migrations
                         .HasColumnType("bit");
 
                     b.Property<string>("OtherUserUID")
-                        .HasColumnType("nvarchar(450)");
+                        .HasColumnType("nvarchar(10)");
 
                     b.Property<byte[]>("Timestamp")
                         .IsConcurrencyToken()
@@ -63,7 +63,7 @@ namespace MareSynchronosServer.Migrations
                         .HasColumnType("rowversion");
 
                     b.Property<string>("UserUID")
-                        .HasColumnType("nvarchar(450)");
+                        .HasColumnType("nvarchar(10)");
 
                     b.HasKey("Id");
 
@@ -77,10 +77,8 @@ namespace MareSynchronosServer.Migrations
             modelBuilder.Entity("MareSynchronosServer.Models.FileCache", b =>
                 {
                     b.Property<string>("Hash")
-                        .HasColumnType("nvarchar(450)");
-
-                    b.Property<DateTime>("LastAccessTime")
-                        .HasColumnType("datetime2");
+                        .HasMaxLength(20)
+                        .HasColumnType("nvarchar(40)");
 
                     b.Property<byte[]>("Timestamp")
                         .IsConcurrencyToken()
@@ -91,7 +89,7 @@ namespace MareSynchronosServer.Migrations
                         .HasColumnType("bit");
 
                     b.Property<string>("UploaderUID")
-                        .HasColumnType("nvarchar(450)");
+                        .HasColumnType("nvarchar(10)");
 
                     b.HasKey("Hash");
 
@@ -121,7 +119,8 @@ namespace MareSynchronosServer.Migrations
             modelBuilder.Entity("MareSynchronosServer.Models.User", b =>
                 {
                     b.Property<string>("UID")
-                        .HasColumnType("nvarchar(450)");
+                        .HasMaxLength(10)
+                        .HasColumnType("nvarchar(10)");
 
                     b.Property<string>("CharacterIdentification")
                         .HasColumnType("nvarchar(max)");
diff --git a/MareSynchronosServer/MareSynchronosServer/Models/FileCache.cs b/MareSynchronosServer/MareSynchronosServer/Models/FileCache.cs
index 95c3297..b5a5e22 100644
--- a/MareSynchronosServer/MareSynchronosServer/Models/FileCache.cs
+++ b/MareSynchronosServer/MareSynchronosServer/Models/FileCache.cs
@@ -7,10 +7,10 @@ namespace MareSynchronosServer.Models
     public class FileCache
     {
         [Key]
+        [MaxLength(40)]
         public string Hash { get; set; }
         public User Uploader { get; set; }
         public bool Uploaded { get; set; }
-        public DateTime LastAccessTime { get; set; }
         [Timestamp]
         public byte[] Timestamp { get; set; }
     }
diff --git a/MareSynchronosServer/MareSynchronosServer/Models/User.cs b/MareSynchronosServer/MareSynchronosServer/Models/User.cs
index bca6496..5bc9a54 100644
--- a/MareSynchronosServer/MareSynchronosServer/Models/User.cs
+++ b/MareSynchronosServer/MareSynchronosServer/Models/User.cs
@@ -6,6 +6,7 @@ namespace MareSynchronosServer.Models
     public class User
     {
         [Key]
+        [MaxLength(10)]
         public string UID { get; set; }
         public string SecretKey { get; set; }
         public string CharacterIdentification { get; set; }