diff --git a/Core/Callbacks/QuestCallbacks.cs b/Core/Callbacks/QuestCallbacks.cs
index c44293f1..74493479 100644
--- a/Core/Callbacks/QuestCallbacks.cs
+++ b/Core/Callbacks/QuestCallbacks.cs
@@ -1,8 +1,6 @@
 using Core.Annotations;
 using Core.Controllers;
 using Core.Models.Eft.Common;
-using Core.Models.Eft.Common.Tables;
-using Core.Models.Eft.HttpResponse;
 using Core.Models.Eft.ItemEvent;
 using Core.Models.Eft.Quests;
 using Core.Utils;
@@ -10,24 +8,12 @@ using Core.Utils;
 namespace Core.Callbacks;
 
 [Injectable]
-public class QuestCallbacks
+public class QuestCallbacks(
+    HttpResponseUtil _httpResponseUtil,
+    QuestController _questController,
+    RepeatableQuestController _repeatableQuestController
+)
 {
-    protected HttpResponseUtil _httpResponseUtil;
-    protected QuestController _questController;
-    protected RepeatableQuestController _repeatableQuestController;
-
-    public QuestCallbacks
-    (
-        HttpResponseUtil httpResponseUtil,
-        QuestController questController,
-        RepeatableQuestController repeatableQuestController
-    )
-    {
-        _httpResponseUtil = httpResponseUtil;
-        _questController = questController;
-        _repeatableQuestController = repeatableQuestController;
-    }
-
     /// <summary>
     /// Handle RepeatableQuestChange event
     /// </summary>
@@ -53,7 +39,7 @@ public class QuestCallbacks
     {
         if (info.Type == "repeatable")
             return _questController.AcceptRepeatableQuest(pmcData, info, sessionID);
-        
+
         return _questController.AcceptQuest(pmcData, info, sessionID);
     }
 
diff --git a/Core/Callbacks/RagfairCallbacks.cs b/Core/Callbacks/RagfairCallbacks.cs
index 641c7287..3f457fd0 100644
--- a/Core/Callbacks/RagfairCallbacks.cs
+++ b/Core/Callbacks/RagfairCallbacks.cs
@@ -4,7 +4,6 @@ using Core.DI;
 using Core.Models.Eft.Common;
 using Core.Models.Eft.ItemEvent;
 using Core.Models.Eft.Ragfair;
-using Core.Models.Enums;
 using Core.Models.Spt.Config;
 using Core.Servers;
 using Core.Services;
@@ -15,32 +14,15 @@ namespace Core.Callbacks;
 [Injectable(InjectableTypeOverride = typeof(OnLoad), TypePriority = OnLoadOrder.RagfairCallbacks)]
 [Injectable(InjectableTypeOverride = typeof(OnUpdate), TypePriority = OnUpdateOrder.RagfairCallbacks)]
 [Injectable(InjectableTypeOverride = typeof(RagfairCallbacks))]
-public class RagfairCallbacks : OnLoad, OnUpdate
+public class RagfairCallbacks(
+    HttpResponseUtil _httpResponseUtil,
+    // RagfairServer _ragfairServer
+    RagfairController _ragfairController,
+    RagfairTaxService _ragfairTaxService,
+    ConfigServer _configServer
+    ) : OnLoad, OnUpdate
 {
-    protected HttpResponseUtil _httpResponseUtil;
-    // protected RagfairServer _ragfairServer;
-    protected RagfairController _ragfairController;
-    protected RagfairTaxService _ragfairTaxService;
-    protected ConfigServer _configServer;
-
-    private RagfairConfig _ragfairConfig;
-
-    public RagfairCallbacks
-    (
-        HttpResponseUtil httpResponseUtil,
-        // RagfairServer ragfairServer,
-        RagfairController ragfairController,
-        RagfairTaxService ragfairTaxService,
-        ConfigServer configServer
-    )
-    {
-        _httpResponseUtil = httpResponseUtil;
-        // _ragfairServer = ragfairServer;
-        _ragfairController = ragfairController;
-        _ragfairTaxService = ragfairTaxService;
-        _configServer = configServer;
-        _ragfairConfig = _configServer.GetConfig<RagfairConfig>();
-    }
+    private RagfairConfig _ragfairConfig = _configServer.GetConfig<RagfairConfig>();
 
     public async Task OnLoad()
     {
diff --git a/Core/Callbacks/RepairCallbacks.cs b/Core/Callbacks/RepairCallbacks.cs
index b90a501a..9a6ab818 100644
--- a/Core/Callbacks/RepairCallbacks.cs
+++ b/Core/Callbacks/RepairCallbacks.cs
@@ -7,18 +7,8 @@ using Core.Models.Eft.Repair;
 namespace Core.Callbacks;
 
 [Injectable]
-public class RepairCallbacks
+public class RepairCallbacks(RepairController _repairController)
 {
-    protected RepairController _repairController;
-
-    public RepairCallbacks
-    (
-        RepairController repairController
-    )
-    {
-        _repairController = repairController;
-    }
-
     /// <summary>
     /// Handle TraderRepair event
     /// use trader to repair item
diff --git a/Core/Callbacks/SaveCallbacks.cs b/Core/Callbacks/SaveCallbacks.cs
index 5f8bd346..ad267046 100644
--- a/Core/Callbacks/SaveCallbacks.cs
+++ b/Core/Callbacks/SaveCallbacks.cs
@@ -1,6 +1,5 @@
 using Core.Annotations;
 using Core.DI;
-using Core.Models.Enums;
 using Core.Models.Spt.Config;
 using Core.Servers;
 using Core.Services;
@@ -9,38 +8,30 @@ namespace Core.Callbacks;
 
 [Injectable(InjectableTypeOverride = typeof(OnLoad), TypePriority = OnLoadOrder.SaveCallbacks)]
 [Injectable(InjectableTypeOverride = typeof(OnUpdate), TypePriority = OnUpdateOrder.SaveCallbacks)]
-public class SaveCallbacks : OnLoad, OnUpdate
-{
-    protected SaveServer _saveServer;
-    protected CoreConfig _coreConfig;
-    protected BackupService _backupService;
-
-    public SaveCallbacks(
-        SaveServer saveServer,
-        ConfigServer configServer,
-        BackupService backupService
+public class SaveCallbacks(
+    SaveServer _saveServer,
+    ConfigServer _configServer,
+    BackupService _backupService
     )
-    {
-        _saveServer = saveServer;
-        _coreConfig = configServer.GetConfig<CoreConfig>();
-        _backupService = backupService;
-    }
+    : OnLoad, OnUpdate
+{
+    private readonly CoreConfig _coreConfig = _configServer.GetConfig<CoreConfig>();
 
     public async Task OnLoad()
     {
-        _backupService.InitAsync();
+        await _backupService.InitAsync();
         _saveServer.Load();
     }
 
-    public async Task<bool> OnUpdate(long SecondsSinceLastRun)
+    public Task<bool> OnUpdate(long SecondsSinceLastRun)
     {
         if (SecondsSinceLastRun > _coreConfig.ProfileSaveIntervalInSeconds)
         {
             _saveServer.Save();
-            return true;
+            return Task.FromResult(true);
         }
 
-        return false;
+        return Task.FromResult(false);
     }
 
     public string GetRoute()