diff --git a/JetKarmaBot/Models/Award.cs b/JetKarmaBot/Models/Award.cs
index f5e9023..36354f4 100644
--- a/JetKarmaBot/Models/Award.cs
+++ b/JetKarmaBot/Models/Award.cs
@@ -10,7 +10,7 @@ namespace JetKarmaBot.Models
         public long ChatId { get; set; }
         public int FromId { get; set; }
         public int ToId { get; set; }
-        public sbyte AwardTypeId { get; set; }
+        public sbyte? AwardTypeId { get; set; }
         public sbyte Amount { get; set; }
         public DateTime Date { get; set; }
         [ForeignKey("AwardTypeId")]
diff --git a/JetKarmaBot/Models/AwardType.cs b/JetKarmaBot/Models/AwardType.cs
index 2afeea9..e2a4a74 100644
--- a/JetKarmaBot/Models/AwardType.cs
+++ b/JetKarmaBot/Models/AwardType.cs
@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations.Schema;
 
 namespace JetKarmaBot.Models
 {
@@ -12,10 +13,13 @@ namespace JetKarmaBot.Models
 
         public sbyte AwardTypeId { get; set; }
         public string CommandName { get; set; }
+        public long ChatId { get; set; }
         public string Name { get; set; }
         public string Symbol { get; set; }
         public string Description { get; set; }
 
         public virtual ICollection<Award> Awards { get; set; }
+        [ForeignKey("ChatId")]
+        public virtual Chat Chat { get; set; }
     }
 }
diff --git a/JetKarmaBot/Models/Chat.cs b/JetKarmaBot/Models/Chat.cs
index ddb6076..acb0069 100644
--- a/JetKarmaBot/Models/Chat.cs
+++ b/JetKarmaBot/Models/Chat.cs
@@ -5,15 +5,11 @@ namespace JetKarmaBot.Models
 {
     public partial class Chat
     {
-        public Chat()
-        {
-            Awards = new HashSet<Award>();
-        }
-
         public long ChatId { get; set; }
         public string Locale { get; set; }
         public bool IsAdministrator { get; set; }
 
         public virtual ICollection<Award> Awards { get; set; }
+        public virtual ICollection<AwardType> AwardTypes { get; set; }
     }
 }
diff --git a/JetKarmaBot/Models/KarmaContext.cs b/JetKarmaBot/Models/KarmaContext.cs
index 179c5e4..4307dd5 100644
--- a/JetKarmaBot/Models/KarmaContext.cs
+++ b/JetKarmaBot/Models/KarmaContext.cs
@@ -112,8 +112,8 @@ namespace JetKarmaBot.Models
                     .HasName("awardtypeid_UNIQUE")
                     .IsUnique();
 
-                entity.HasIndex(e => e.CommandName)
-                    .HasName("commandname_UNIQUE")
+                entity.HasIndex(e => new { e.CommandName, e.ChatId })
+                    .HasName("un_cnandchat")
                     .IsUnique();
 
                 entity.Property(e => e.AwardTypeId)
@@ -139,6 +139,12 @@ namespace JetKarmaBot.Models
                     .IsRequired()
                     .HasColumnName("symbol")
                     .HasColumnType("varchar(16)");
+
+                entity.HasOne(d => d.Chat)
+                    .WithMany(p => p.AwardTypes)
+                    .HasForeignKey(d => d.ChatId)
+                    .OnDelete(DeleteBehavior.ClientSetNull)
+                    .HasConstraintName("fk_chat");
             });
 
             modelBuilder.Entity<Chat>(entity =>
diff --git a/karma.sql b/karma.sql
index 22cd05d..abef214 100644
--- a/karma.sql
+++ b/karma.sql
@@ -3,17 +3,15 @@
 
 DROP TABLE IF EXISTS `awardtype`;
 CREATE TABLE `awardtype` (
-  `awardtypeid` tinyint(3) NOT NULL PRIMARY KEY,
-  `commandname` varchar(35) NOT NULL UNIQUE,
+  `awardtypeid` tinyint(3) NOT NULL PRIMARY KEY AUTO_INCREMENT,
+  `commandname` varchar(35) NOT NULL,
+  `chatid` bigint(20) NOT NULL REFERENCES `chat` (`chatid`),
   `name` varchar(32) NOT NULL,
   `symbol` varchar(16)  NOT NULL,
-  `description` text NOT NULL
+  `description` text NOT NULL,
+  UNIQUE KEY `un_cnandchat` (`commandname`, `chatid`)
 );
 
-LOCK TABLES `awardtype` WRITE;
-INSERT INTO `awardtype` VALUES (1,'example','Example','Examples','An example');
-UNLOCK TABLES;
-
 DROP TABLE IF EXISTS `chat`;
 CREATE TABLE `chat` (
   `chatid` bigint(20) NOT NULL PRIMARY KEY,
@@ -23,9 +21,8 @@ CREATE TABLE `chat` (
 
 DROP TABLE IF EXISTS `user`;
 CREATE TABLE `user` (
-  `userid` bigint(20) NOT NULL,
-  `username` varchar(45) DEFAULT NULL,
-  PRIMARY KEY (`userid`)
+  `userid` bigint(20) NOT NULL PRIMARY KEY,
+  `username` varchar(45) DEFAULT NULL
 );
 
 DROP TABLE IF EXISTS `award`;
@@ -34,7 +31,7 @@ CREATE TABLE `award` (
   `chatid` bigint(20) NOT NULL REFERENCES `chat` (`chatid`),
   `fromid` bigint(20) NOT NULL  REFERENCES `user` (`userid`),
   `toid` bigint(20) NOT NULL REFERENCES `user` (`userid`),
-  `awardtypeid` tinyint(3) NOT NULL REFERENCES `awardtype` (`awardtypeid`),
+  `awardtypeid` tinyint(3) REFERENCES `awardtype` (`awardtypeid`),
   `amount` tinyint(3) NOT NULL DEFAULT 1,
   `date` datetime NOT NULL DEFAULT current_timestamp()
 );
\ No newline at end of file