diff --git a/Core/Models/Spt/Config/QuestConfig.cs b/Core/Models/Spt/Config/QuestConfig.cs
index 7994515c..addc2ce4 100644
--- a/Core/Models/Spt/Config/QuestConfig.cs
+++ b/Core/Models/Spt/Config/QuestConfig.cs
@@ -12,254 +12,255 @@ public class QuestConfig : BaseConfig
 
     // Hours to get/redeem items from quest mail keyed by profile type
     [JsonPropertyName("mailRedeemTimeHours")]
-    public Dictionary<string, double> MailRedeemTimeHours { get; set; }
+    public Dictionary<string, double?>? MailRedeemTimeHours { get; set; }
 
     [JsonPropertyName("questTemplateIds")]
-    public PlayerTypeQuestIds QuestTemplateIds { get; set; }
+    public PlayerTypeQuestIds? QuestTemplateIds { get; set; }
 
     /** Show non-seasonal quests be shown to player */
     [JsonPropertyName("showNonSeasonalEventQuests")]
-    public bool ShowNonSeasonalEventQuests { get; set; }
+    public bool? ShowNonSeasonalEventQuests { get; set; }
 
     [JsonPropertyName("eventQuests")]
-    public Dictionary<string, EventQuestData> EventQuests { get; set; }
+    public Dictionary<string, EventQuestData>? EventQuests { get; set; }
 
     [JsonPropertyName("repeatableQuests")]
-    public List<RepeatableQuestConfig> RepeatableQuests { get; set; }
+    public List<RepeatableQuestConfig>? RepeatableQuests { get; set; }
 
     [JsonPropertyName("locationIdMap")]
-    public Dictionary<string, string> LocationIdMap { get; set; }
+    public Dictionary<string, string>? LocationIdMap { get; set; }
 
     [JsonPropertyName("bearOnlyQuests")]
-    public List<string> BearOnlyQuests { get; set; }
+    public List<string>? BearOnlyQuests { get; set; }
 
     [JsonPropertyName("usecOnlyQuests")]
-    public List<string> UsecOnlyQuests { get; set; }
+    public List<string>? UsecOnlyQuests { get; set; }
 
     /** Quests that the keyed game version do not see/access */
     [JsonPropertyName("profileBlacklist")]
-    public Dictionary<string, List<string>> ProfileBlacklist { get; set; }
+    public Dictionary<string, List<string>>? ProfileBlacklist { get; set; }
 
     /** key=questid, gameversions that can see/access quest */
     [JsonPropertyName("profileWhitelist")]
-    public Dictionary<string, List<string>> ProfileWhitelist { get; set; }
+    public Dictionary<string, List<string>>? ProfileWhitelist { get; set; }
 }
 
 public class PlayerTypeQuestIds
 {
     [JsonPropertyName("pmc")]
-    public QuestTypeIds Pmc { get; set; }
+    public QuestTypeIds? Pmc { get; set; }
 
     [JsonPropertyName("scav")]
-    public QuestTypeIds Scav { get; set; }
+    public QuestTypeIds? Scav { get; set; }
 }
 
 public class QuestTypeIds
 {
     [JsonPropertyName("elimination")]
-    public string Elimination { get; set; }
+    public string? Elimination { get; set; }
 
     [JsonPropertyName("completion")]
-    public string Completion { get; set; }
+    public string? Completion { get; set; }
 
     [JsonPropertyName("exploration")]
-    public string Exploration { get; set; }
+    public string? Exploration { get; set; }
     
     [JsonPropertyName("pickup")]
-    public string Pickup { get; set; }
+    public string? Pickup { get; set; }
 }
 
 public class EventQuestData
 {
     [JsonPropertyName("name")]
-    public string Name { get; set; }
+    public string? Name { get; set; }
 
     [JsonPropertyName("season")]
-    public SeasonalEventType Season { get; set; }
+    public SeasonalEventType? Season { get; set; }
 
     [JsonPropertyName("startTimestamp")]
-    public long StartTimestamp { get; set; }
+    public long? StartTimestamp { get; set; }
 
     [JsonPropertyName("endTimestamp")]
     [JsonConverter(typeof(StringToNumberFactoryConverter))]
     public long? EndTimestamp { get; set; }
 
     [JsonPropertyName("yearly")]
-    public bool Yearly { get; set; }
+    public bool? Yearly { get; set; }
 }
 
 public class RepeatableQuestConfig
 {
     [JsonPropertyName("id")]
-    public string Id { get; set; }
+    public string? Id { get; set; }
 
     [JsonPropertyName("name")]
-    public string Name { get; set; }
+    public string? Name { get; set; }
 
     [JsonPropertyName("side")]
-    public string Side { get; set; }
+    public string? Side { get; set; }
 
     [JsonPropertyName("types")]
-    public List<string> Types { get; set; }
+    public List<string>? Types { get; set; }
 
     [JsonPropertyName("resetTime")]
-    public long ResetTime { get; set; }
+    public long? ResetTime { get; set; }
 
     [JsonPropertyName("numQuests")]
-    public int NumQuests { get; set; }
+    public int? NumQuests { get; set; }
 
     [JsonPropertyName("minPlayerLevel")]
-    public int MinPlayerLevel { get; set; }
+    public int? MinPlayerLevel { get; set; }
 
     [JsonPropertyName("rewardScaling")]
-    public RewardScaling RewardScaling { get; set; }
+    public RewardScaling? RewardScaling { get; set; }
 
     [JsonPropertyName("locations")]
-    public Dictionary<ELocationName, List<string>> Locations { get; set; }
+    public Dictionary<ELocationName, List<string>>? Locations { get; set; }
 
     [JsonPropertyName("traderWhitelist")]
-    public List<TraderWhitelist> TraderWhitelist { get; set; }
+    public List<TraderWhitelist>? TraderWhitelist { get; set; }
 
     [JsonPropertyName("questConfig")]
-    public RepeatableQuestTypesConfig QuestConfig { get; set; }
+    public RepeatableQuestTypesConfig? QuestConfig { get; set; }
 
     /** Item base types to block when generating rewards */
     [JsonPropertyName("rewardBaseTypeBlacklist")]
-    public List<string> RewardBaseTypeBlacklist { get; set; }
+    public List<string>? RewardBaseTypeBlacklist { get; set; }
 
     /** Item tplIds to ignore when generating rewards */
     [JsonPropertyName("rewardBlacklist")]
-    public List<string> RewardBlacklist { get; set; }
+    public List<string>? RewardBlacklist { get; set; }
 
     [JsonPropertyName("rewardAmmoStackMinSize")]
-    public int RewardAmmoStackMinSize { get; set; }
+    public int? RewardAmmoStackMinSize { get; set; }
 
     [JsonPropertyName("freeChangesAvailable")]
-    public int FreeChangesAvailable { get; set; }
+    public int? FreeChangesAvailable { get; set; }
 
     [JsonPropertyName("freeChanges")]
-    public int FreeChanges { get; set; }
+    public int? FreeChanges { get; set; }
 
     [JsonPropertyName("keepDailyQuestTypeOnReplacement")]
-    public bool KeepDailyQuestTypeOnReplacement { get; set; }
+    public bool? KeepDailyQuestTypeOnReplacement { get; set; }
 }
 
 public class RewardScaling
 {
     [JsonPropertyName("levels")]
-    public List<int> Levels { get; set; }
+    public List<int>? Levels { get; set; }
 
     [JsonPropertyName("experience")]
-    public List<int> Experience { get; set; }
+    public List<int>? Experience { get; set; }
 
     [JsonPropertyName("roubles")]
-    public List<int> Roubles { get; set; }
+    public List<int>? Roubles { get; set; }
 
     [JsonPropertyName("gpCoins")]
-    public List<int> GpCoins { get; set; }
+    public List<int>? GpCoins { get; set; }
 
     [JsonPropertyName("items")]
-    public List<int> Items { get; set; }
+    public List<int>? Items { get; set; }
 
     [JsonPropertyName("reputation")]
-    public List<double> Reputation { get; set; }
+    public List<double>? Reputation { get; set; }
 
     [JsonPropertyName("rewardSpread")]
-    public double RewardSpread { get; set; }
+    public double? RewardSpread { get; set; }
 
     [JsonPropertyName("skillRewardChance")]
-    public List<double> SkillRewardChance { get; set; }
+    public List<double>? SkillRewardChance { get; set; }
 
     [JsonPropertyName("skillPointReward")]
-    public List<int> SkillPointReward { get; set; }
+    public List<int>? SkillPointReward { get; set; }
 }
 
 public class TraderWhitelist
 {
     [JsonPropertyName("name")]
-    public string Name { get; set; }
+    public string? Name { get; set; }
+    
     [JsonPropertyName("traderId")]
-    public string TraderId { get; set; }
+    public string? TraderId { get; set; }
 
     [JsonPropertyName("questTypes")]
-    public List<string> QuestTypes { get; set; }
+    public List<string>? QuestTypes { get; set; }
 
     [JsonPropertyName("rewardBaseWhitelist")]
-    public List<string> RewardBaseWhitelist { get; set; }
+    public List<string>? RewardBaseWhitelist { get; set; }
 
     [JsonPropertyName("rewardCanBeWeapon")]
-    public bool RewardCanBeWeapon { get; set; }
+    public bool? RewardCanBeWeapon { get; set; }
 
     [JsonPropertyName("weaponRewardChancePercent")]
-    public double WeaponRewardChancePercent { get; set; }
+    public double? WeaponRewardChancePercent { get; set; }
 }
 
 public class RepeatableQuestTypesConfig
 {
     [JsonPropertyName("Exploration")]
-    public Exploration Exploration { get; set; }
+    public Exploration? Exploration { get; set; }
 
     [JsonPropertyName("Completion")]
-    public Completion Completion { get; set; }
+    public Completion? Completion { get; set; }
 
     [JsonPropertyName("Pickup")]
-    public Pickup Pickup { get; set; }
+    public Pickup? Pickup { get; set; }
 
     [JsonPropertyName("Elimination")]
-    public List<EliminationConfig> Elimination { get; set; }
+    public List<EliminationConfig>? Elimination { get; set; }
 }
 
 public class Exploration : BaseQuestConfig
 {
     [JsonPropertyName("maxExtracts")]
-    public int MaximumExtracts { get; set; }
+    public int? MaximumExtracts { get; set; }
 
     [JsonPropertyName("maxExtractsWithSpecificExit")]
-    public int MaximumExtractsWithSpecificExit { get; set; }
+    public int? MaximumExtractsWithSpecificExit { get; set; }
 
     [JsonPropertyName("specificExits")]
-    public SpecificExits SpecificExits { get; set; }
+    public SpecificExits? SpecificExits { get; set; }
 }
 
 public class SpecificExits
 {
     [JsonPropertyName("probability")]
-    public double Probability { get; set; }
+    public double? Probability { get; set; }
 
     [JsonPropertyName("passageRequirementWhitelist")]
-    public List<string> PassageRequirementWhitelist { get; set; }
+    public List<string>? PassageRequirementWhitelist { get; set; }
 }
 
 public class Completion : BaseQuestConfig
 {
     [JsonPropertyName("minRequestedAmount")]
-    public int MinimumRequestedAmount { get; set; }
+    public int? MinimumRequestedAmount { get; set; }
 
     [JsonPropertyName("maxRequestedAmount")]
-    public int MaximumRequestedAmount { get; set; }
+    public int? MaximumRequestedAmount { get; set; }
 
     [JsonPropertyName("uniqueItemCount")]
-    public int UniqueItemCount { get; set; }
+    public int? UniqueItemCount { get; set; }
 
     [JsonPropertyName("minRequestedBulletAmount")]
-    public int MinimumRequestedBulletAmount { get; set; }
+    public int? MinimumRequestedBulletAmount { get; set; }
 
     [JsonPropertyName("maxRequestedBulletAmount")]
-    public int MaximumRequestedBulletAmount { get; set; }
+    public int? MaximumRequestedBulletAmount { get; set; }
 
     [JsonPropertyName("useWhitelist")]
-    public bool UseWhitelist { get; set; }
+    public bool? UseWhitelist { get; set; }
 
     [JsonPropertyName("useBlacklist")]
-    public bool UseBlacklist { get; set; }
+    public bool? UseBlacklist { get; set; }
 }
 
 public class Pickup : BaseQuestConfig
 {
     [JsonPropertyName("ItemTypeToFetchWithMaxCount")]
-    public List<PickupTypeWithMaxCount> ItemTypeToFetchWithMaxCount { get; set; }
+    public List<PickupTypeWithMaxCount>? ItemTypeToFetchWithMaxCount { get; set; }
     
-    public List<string> ItemTypesToFetch { get; set; }
+    public List<string>? ItemTypesToFetch { get; set; }
     
     [JsonPropertyName("maxItemFetchCount")]
     public int? MaxItemFetchCount { get; set; }
@@ -268,116 +269,116 @@ public class Pickup : BaseQuestConfig
 public class PickupTypeWithMaxCount
 {
     [JsonPropertyName("itemType")]
-    public string ItemType { get; set; }
+    public string? ItemType { get; set; }
 
     [JsonPropertyName("maxPickupCount")]
-    public int MaximumPickupCount { get; set; }
+    public int? MaximumPickupCount { get; set; }
 
     [JsonPropertyName("minPickupCount")]
-    public int MinimumPickupCount { get; set; }
+    public int? MinimumPickupCount { get; set; }
 }
 
 public class EliminationConfig : BaseQuestConfig
 {
     [JsonPropertyName("levelRange")]
-    public MinMax LevelRange { get; set; }
+    public MinMax? LevelRange { get; set; }
 
     [JsonPropertyName("targets")]
-    public List<Target> Targets { get; set; }
+    public List<Target>? Targets { get; set; }
 
     [JsonPropertyName("bodyPartProb")]
-    public double BodyPartProbability { get; set; }
+    public double? BodyPartProbability { get; set; }
 
     [JsonPropertyName("bodyParts")]
-    public List<BodyPart> BodyParts { get; set; }
+    public List<BodyPart>? BodyParts { get; set; }
 
     [JsonPropertyName("specificLocationProb")]
-    public double SpecificLocationProbability { get; set; }
+    public double? SpecificLocationProbability { get; set; }
 
     [JsonPropertyName("distLocationBlacklist")]
-    public List<string> DistLocationBlacklist { get; set; }
+    public List<string>? DistLocationBlacklist { get; set; }
 
     [JsonPropertyName("distProb")]
-    public double DistanceProbability { get; set; }
+    public double? DistanceProbability { get; set; }
 
     [JsonPropertyName("maxDist")]
-    public double MaxDistance { get; set; }
+    public double? MaxDistance { get; set; }
 
     [JsonPropertyName("minDist")]
-    public double MinDistance { get; set; }
+    public double? MinDistance { get; set; }
 
     [JsonPropertyName("maxKills")]
-    public int MaxKills { get; set; }
+    public int? MaxKills { get; set; }
 
     [JsonPropertyName("minKills")]
-    public int MinKills { get; set; }
+    public int? MinKills { get; set; }
 
     [JsonPropertyName("minBossKills")]
-    public int MinBossKills { get; set; }
+    public int? MinBossKills { get; set; }
 
     [JsonPropertyName("maxBossKills")]
-    public int MaxBossKills { get; set; }
+    public int? MaxBossKills { get; set; }
 
     [JsonPropertyName("minPmcKills")]
-    public int MinPmcKills { get; set; }
+    public int? MinPmcKills { get; set; }
 
     [JsonPropertyName("maxPmcKills")]
-    public int MaxPmcKills { get; set; }
+    public int? MaxPmcKills { get; set; }
 
     [JsonPropertyName("weaponCategoryRequirementProb")]
-    public double WeaponCategoryRequirementProbability { get; set; }
+    public double? WeaponCategoryRequirementProbability { get; set; }
 
     [JsonPropertyName("weaponCategoryRequirements")]
-    public List<WeaponRequirement> WeaponCategoryRequirements { get; set; }
+    public List<WeaponRequirement>? WeaponCategoryRequirements { get; set; }
 
     [JsonPropertyName("weaponRequirementProb")]
-    public double WeaponRequirementProbability { get; set; }
+    public double? WeaponRequirementProbability { get; set; }
 
     [JsonPropertyName("weaponRequirements")]
-    public List<WeaponRequirement> WeaponRequirements { get; set; }
+    public List<WeaponRequirement>? WeaponRequirements { get; set; }
 }
 
 public class BaseQuestConfig
 {
     [JsonPropertyName("possibleSkillRewards")]
-    public List<string> PossibleSkillRewards { get; set; }
+    public List<string>? PossibleSkillRewards { get; set; }
 }
 
 public class Target : ProbabilityObject
 {
     [JsonPropertyName("data")]
-    public BossInfo Data { get; set; }
+    public BossInfo? Data { get; set; }
 }
 
 public class BossInfo
 {
     [JsonPropertyName("isBoss")]
-    public bool IsBoss { get; set; }
+    public bool? IsBoss { get; set; }
 
     [JsonPropertyName("isPmc")]
-    public bool IsPmc { get; set; }
+    public bool? IsPmc { get; set; }
 }
 
 public class BodyPart : ProbabilityObject
 {
     [JsonPropertyName("data")]
-    public string[] Data { get; set; }
+    public List<string>? Data { get; set; }
 }
 
 public class WeaponRequirement : ProbabilityObject
 {
     [JsonPropertyName("data")]
-    public string[] Data { get; set; }
+    public List<string>? Data { get; set; }
 }
 
 public class ProbabilityObject
 {
     [JsonPropertyName("key")]
-    public string Key { get; set; }
+    public string? Key { get; set; }
 
     [JsonPropertyName("relativeProbability")]
-    public double RelativeProbability { get; set; }
+    public double? RelativeProbability { get; set; }
 
     [JsonPropertyName("data")]
-    public object Data { get; set; }
+    public object? Data { get; set; }
 }
diff --git a/Core/Services/BotLootCacheService.cs b/Core/Services/BotLootCacheService.cs
index 5eb35955..e88fe152 100644
--- a/Core/Services/BotLootCacheService.cs
+++ b/Core/Services/BotLootCacheService.cs
@@ -236,8 +236,8 @@ public class BotLootCacheService
 
         // Assign whitelisted special items to bot if any exist
         var specialLootItems =
-            botJsonTemplate.BotGeneration.Items.SpecialItems.Whitelist.Count > 0
-                ? botJsonTemplate.BotGeneration.Items.SpecialItems.Whitelist
+            botJsonTemplate.BotGeneration?.Items?.SpecialItems?.Whitelist?.Count > 0
+                ? botJsonTemplate.BotGeneration?.Items?.SpecialItems?.Whitelist
                 : new Dictionary<string, double>();
 
         // no whitelist, find and assign from combined item pool
@@ -256,8 +256,8 @@ public class BotLootCacheService
 
         // Assign whitelisted healing items to bot if any exist
         var healingItems =
-            botJsonTemplate.BotGeneration.Items.Healing.Whitelist.Count > 0
-                ? botJsonTemplate.BotGeneration.Items.Healing.Whitelist
+            botJsonTemplate.BotGeneration?.Items?.Healing?.Whitelist?.Count > 0
+                ? botJsonTemplate.BotGeneration?.Items?.Healing?.Whitelist
                 : new Dictionary<string, double>();
 
         // No whitelist, find and assign from combined item pool
@@ -279,7 +279,7 @@ public class BotLootCacheService
         }
 
         // Assign whitelisted drugs to bot if any exist
-        var drugItems = botJsonTemplate.BotGeneration.Items.Drugs.Whitelist ?? new Dictionary<string, double>();
+        var drugItems = botJsonTemplate.BotGeneration?.Items?.Drugs?.Whitelist ?? new Dictionary<string, double>();
         // no drugs whitelist, find and assign from combined item pool
         if (!drugItems.Any())
         {
@@ -294,7 +294,7 @@ public class BotLootCacheService
         }
 
         // Assign whitelisted food to bot if any exist
-        var foodItems = botJsonTemplate.BotGeneration.Items.Food.Whitelist ?? new Dictionary<string, double>();
+        var foodItems = botJsonTemplate.BotGeneration?.Items?.Food?.Whitelist ?? new Dictionary<string, double>();
         // No food whitelist, find and assign from combined item pool
         if (!foodItems.Any())
         {
@@ -309,7 +309,7 @@ public class BotLootCacheService
         }
 
         // Assign whitelisted drink to bot if any exist
-        var drinkItems = botJsonTemplate.BotGeneration.Items.Food.Whitelist ?? new Dictionary<string, double>();
+        var drinkItems = botJsonTemplate.BotGeneration?.Items?.Food?.Whitelist ?? new Dictionary<string, double>();
         // No drink whitelist, find and assign from combined item pool
         if (!drinkItems.Any())
         {
@@ -324,7 +324,7 @@ public class BotLootCacheService
         }
 
         // Assign whitelisted currency to bot if any exist
-        var currencyItems = botJsonTemplate.BotGeneration.Items.Currency.Whitelist ?? new Dictionary<string, double>();
+        var currencyItems = botJsonTemplate.BotGeneration?.Items?.Currency?.Whitelist ?? new Dictionary<string, double>();
         // No currency whitelist, find and assign from combined item pool
         if (!currencyItems.Any())
         {
@@ -339,7 +339,7 @@ public class BotLootCacheService
         }
 
         // Assign whitelisted stims to bot if any exist
-        var stimItems = botJsonTemplate.BotGeneration.Items.Stims.Whitelist ?? new Dictionary<string, double>();
+        var stimItems = botJsonTemplate.BotGeneration?.Items?.Stims?.Whitelist ?? new Dictionary<string, double>();
         // No whitelist, find and assign from combined item pool
         if (!stimItems.Any())
         {
@@ -354,7 +354,7 @@ public class BotLootCacheService
         }
 
         // Assign whitelisted grenades to bot if any exist
-        var grenadeItems = botJsonTemplate.BotGeneration.Items.Grenades.Whitelist ?? new Dictionary<string, double>();
+        var grenadeItems = botJsonTemplate.BotGeneration?.Items?.Grenades?.Whitelist ?? new Dictionary<string, double>();
         // no whitelist, find and assign from combined item pool
         if (!grenadeItems.Any())
         {
diff --git a/Core/Services/MailSendService.cs b/Core/Services/MailSendService.cs
index 3ee5033d..cf4b6360 100644
--- a/Core/Services/MailSendService.cs
+++ b/Core/Services/MailSendService.cs
@@ -130,8 +130,8 @@ public class MailSendService
         string messageLocaleId,
         List<Item>? items,
         long? maxStorageTimeSeconds,
-        SystemData? systemData,
-        MessageContentRagfair? ragfair
+        SystemData? systemData = null,
+        MessageContentRagfair? ragfair = null
     )
     {
         if (trader is null)