diff --git a/src/controllers/api/giveQuestKey.ts b/src/controllers/api/giveQuestKey.ts
index 070dea75..8cd4b135 100644
--- a/src/controllers/api/giveQuestKey.ts
+++ b/src/controllers/api/giveQuestKey.ts
@@ -38,7 +38,7 @@ export interface IQuestKeyReward {
     Duration: number;
     CouponSku: number;
     Syndicate: string;
-    Milestones: any[];
+    //Milestones: any[];
     ChooseSetIndex: number;
     NewSystemReward: boolean;
     _id: IOid;
diff --git a/src/controllers/api/inventoryController.ts b/src/controllers/api/inventoryController.ts
index acb7d2cd..13638df3 100644
--- a/src/controllers/api/inventoryController.ts
+++ b/src/controllers/api/inventoryController.ts
@@ -258,6 +258,7 @@ const resourceGetParent = (resourceName: string): string | undefined => {
     if (resourceName in ExportResources) {
         return ExportResources[resourceName].parentName;
     }
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
     return ExportVirtuals[resourceName]?.parentName;
 };
 
diff --git a/src/controllers/api/joinSessionController.ts b/src/controllers/api/joinSessionController.ts
index 4212c90f..7dff9fc9 100644
--- a/src/controllers/api/joinSessionController.ts
+++ b/src/controllers/api/joinSessionController.ts
@@ -2,12 +2,13 @@ import { RequestHandler } from "express";
 import { getSessionByID } from "@/src/managers/sessionManager";
 import { logger } from "@/src/utils/logger";
 
-const joinSessionController: RequestHandler = (_req, res) => {
-    const reqBody = JSON.parse(String(_req.body));
+export const joinSessionController: RequestHandler = (req, res) => {
+    const reqBody = JSON.parse(String(req.body)) as IJoinSessionRequest;
     logger.debug(`JoinSession Request`, { reqBody });
-    const req = JSON.parse(String(_req.body));
-    const session = getSessionByID(req.sessionIds[0] as string);
+    const session = getSessionByID(reqBody.sessionIds[0]);
     res.json({ rewardSeed: session?.rewardSeed, sessionId: { $oid: session?.sessionId } });
 };
 
-export { joinSessionController };
+interface IJoinSessionRequest {
+    sessionIds: string[];
+}
diff --git a/src/managers/sessionManager.ts b/src/managers/sessionManager.ts
index 98bcc912..d933407a 100644
--- a/src/managers/sessionManager.ts
+++ b/src/managers/sessionManager.ts
@@ -44,7 +44,7 @@ function getSessionByID(sessionId: string): ISession | undefined {
     return sessions.find(session => session.sessionId === sessionId);
 }
 
-function getSession(sessionIdOrRequest: string | IFindSessionRequest): any[] {
+function getSession(sessionIdOrRequest: string | IFindSessionRequest): { createdBy: string; id: string }[] {
     if (typeof sessionIdOrRequest === "string") {
         const session = sessions.find(session => session.sessionId === sessionIdOrRequest);
         if (session) {
@@ -107,8 +107,7 @@ function updateSession(sessionId: string, sessionData: string): boolean {
     const session = sessions.find(session => session.sessionId === sessionId);
     if (!session) return false;
     try {
-        const updatedData = JSON.parse(sessionData);
-        Object.assign(session, updatedData);
+        Object.assign(session, JSON.parse(sessionData));
         return true;
     } catch (error) {
         console.error("Invalid JSON string for session update.");
diff --git a/src/models/inventoryModels/loadoutModel.ts b/src/models/inventoryModels/loadoutModel.ts
index 8eba69c1..e43d33d1 100644
--- a/src/models/inventoryModels/loadoutModel.ts
+++ b/src/models/inventoryModels/loadoutModel.ts
@@ -1,7 +1,7 @@
 import { IOid } from "@/src/types/commonTypes";
 import { IEquipmentSelection } from "@/src/types/inventoryTypes/commonInventoryTypes";
 import { ILoadoutConfigDatabase, ILoadoutDatabase } from "@/src/types/saveLoadoutTypes";
-import { Model, Schema, Types, model } from "mongoose";
+import { Document, Model, Schema, Types, model } from "mongoose";
 
 const oidSchema = new Schema<IOid>(
     {
@@ -97,3 +97,15 @@ type loadoutDocumentProps = {
 type loadoutModelType = Model<ILoadoutDatabase, {}, loadoutDocumentProps>;
 
 export const Loadout = model<ILoadoutDatabase, loadoutModelType>("Loadout", loadoutSchema);
+
+// eslint-disable-next-line @typescript-eslint/ban-types
+export type TLoadoutDatabaseDocument = Document<unknown, {}, ILoadoutDatabase> &
+    Omit<
+        ILoadoutDatabase & {
+            _id: Types.ObjectId;
+        } & {
+            __v: number;
+        },
+        keyof loadoutDocumentProps
+    > &
+    loadoutDocumentProps;
diff --git a/src/models/shipModel.ts b/src/models/shipModel.ts
index 13e1ef53..784a6125 100644
--- a/src/models/shipModel.ts
+++ b/src/models/shipModel.ts
@@ -1,4 +1,4 @@
-import { Schema, model } from "mongoose";
+import { Document, Schema, Types, model } from "mongoose";
 import { IShipDatabase } from "../types/shipTypes";
 import { toOid } from "@/src/helpers/inventoryHelpers";
 import { colorSchema } from "@/src/models/inventoryModels/inventoryModel";
@@ -47,3 +47,11 @@ shipSchema.set("toObject", {
 });
 
 export const Ship = model("Ships", shipSchema);
+
+// eslint-disable-next-line @typescript-eslint/ban-types
+export type TShipDatabaseDocument = Document<unknown, {}, IShipDatabase> &
+    IShipDatabase & {
+        _id: Types.ObjectId;
+    } & {
+        __v: number;
+    };
diff --git a/src/models/statsModel.ts b/src/models/statsModel.ts
index e11ca652..c8f5659b 100644
--- a/src/models/statsModel.ts
+++ b/src/models/statsModel.ts
@@ -4,7 +4,7 @@ import { IEnemy, IMission, IScan, ITutorial, IAbility, IWeapon, IStatsDatabase,
 const abilitySchema = new Schema<IAbility>(
     {
         type: { type: String, required: true },
-        used: Number
+        used: { type: Number, required: true }
     },
     { _id: false }
 );
@@ -32,7 +32,7 @@ const missionSchema = new Schema<IMission>(
 const scanSchema = new Schema<IScan>(
     {
         type: { type: String, required: true },
-        scans: Number
+        scans: { type: Number, required: true }
     },
     { _id: false }
 );
diff --git a/src/services/loadoutService.ts b/src/services/loadoutService.ts
index f9c385c5..265a8150 100644
--- a/src/services/loadoutService.ts
+++ b/src/services/loadoutService.ts
@@ -1,6 +1,6 @@
-import { Loadout } from "@/src/models/inventoryModels/loadoutModel";
+import { Loadout, TLoadoutDatabaseDocument } from "@/src/models/inventoryModels/loadoutModel";
 
-export const getLoadout = async (accountId: string) => {
+export const getLoadout = async (accountId: string): Promise<TLoadoutDatabaseDocument> => {
     const loadout = await Loadout.findOne({ loadoutOwnerId: accountId });
 
     if (!loadout) {
diff --git a/src/services/missionInventoryUpdateService.ts b/src/services/missionInventoryUpdateService.ts
index 71c2828e..fb4a936e 100644
--- a/src/services/missionInventoryUpdateService.ts
+++ b/src/services/missionInventoryUpdateService.ts
@@ -313,6 +313,12 @@ export const addMissionInventoryUpdates = async (
     return inventoryChanges;
 };
 
+interface AddMissionRewardsReturnType {
+    MissionRewards: IMissionReward[];
+    inventoryChanges?: IInventoryChanges;
+    credits?: IMissionCredits;
+}
+
 //TODO: return type of partial missioninventoryupdate response
 export const addMissionRewards = async (
     inventory: TInventoryDatabaseDocument,
@@ -324,7 +330,7 @@ export const addMissionRewards = async (
         VoidTearParticipantsCurrWave: voidTearWave,
         StrippedItems: strippedItems
     }: IMissionInventoryUpdateRequest
-) => {
+): Promise<AddMissionRewardsReturnType> => {
     if (!rewardInfo) {
         //TODO: if there is a case where you can have credits collected during a mission but no rewardInfo, add credits needs to be handled earlier
         logger.debug(`Mission ${missions!.Tag} did not have Reward Info `);
@@ -435,6 +441,13 @@ export const addMissionRewards = async (
     return { inventoryChanges, MissionRewards, credits };
 };
 
+interface IMissionCredits {
+    MissionCredits: number[];
+    CreditBonus: number[];
+    TotalCredits: number[];
+    DailyMissionBonus?: boolean;
+}
+
 //creditBonus is not entirely accurate.
 //TODO: consider ActiveBoosters
 export const addCredits = (
@@ -444,11 +457,11 @@ export const addCredits = (
         missionCompletionCredits,
         rngRewardCredits
     }: { missionDropCredits: number; missionCompletionCredits: number; rngRewardCredits: number }
-) => {
+): IMissionCredits => {
     const hasDailyCreditBonus = true;
     const totalCredits = missionDropCredits + missionCompletionCredits + rngRewardCredits;
 
-    const finalCredits = {
+    const finalCredits: IMissionCredits = {
         MissionCredits: [missionDropCredits, missionDropCredits],
         CreditBonus: [missionCompletionCredits, missionCompletionCredits],
         TotalCredits: [totalCredits, totalCredits]
@@ -471,7 +484,7 @@ export const addFixedLevelRewards = (
     rewards: IMissionRewardExternal,
     inventory: TInventoryDatabaseDocument,
     MissionRewards: IMissionReward[]
-) => {
+): number => {
     let missionBonusCredits = 0;
     if (rewards.credits) {
         missionBonusCredits += rewards.credits;
diff --git a/src/services/personalRoomsService.ts b/src/services/personalRoomsService.ts
index 5325af1c..24399655 100644
--- a/src/services/personalRoomsService.ts
+++ b/src/services/personalRoomsService.ts
@@ -1,7 +1,8 @@
 import { PersonalRooms } from "@/src/models/personalRoomsModel";
 import { addItem, getInventory } from "@/src/services/inventoryService";
+import { TPersonalRoomsDatabaseDocument } from "../types/personalRoomsTypes";
 
-export const getPersonalRooms = async (accountId: string) => {
+export const getPersonalRooms = async (accountId: string): Promise<TPersonalRoomsDatabaseDocument> => {
     const personalRooms = await PersonalRooms.findOne({ personalRoomsOwnerId: accountId });
 
     if (!personalRooms) {
@@ -10,7 +11,7 @@ export const getPersonalRooms = async (accountId: string) => {
     return personalRooms;
 };
 
-export const updateShipFeature = async (accountId: string, shipFeature: string) => {
+export const updateShipFeature = async (accountId: string, shipFeature: string): Promise<void> => {
     const personalRooms = await getPersonalRooms(accountId);
 
     if (personalRooms.Ship.Features.includes(shipFeature)) {
diff --git a/src/services/purchaseService.ts b/src/services/purchaseService.ts
index d960c629..b3d795a3 100644
--- a/src/services/purchaseService.ts
+++ b/src/services/purchaseService.ts
@@ -108,8 +108,11 @@ export const handlePurchase = async (
                 ];
             }
             purchaseRequest.PurchaseParams.Quantity *= offer.QuantityMultiplier;
-        } else if (!ExportVendors[purchaseRequest.PurchaseParams.SourceId!]) {
-            throw new Error(`unknown vendor: ${purchaseRequest.PurchaseParams.SourceId!}`);
+        } else {
+            // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
+            if (!ExportVendors[purchaseRequest.PurchaseParams.SourceId!]) {
+                throw new Error(`unknown vendor: ${purchaseRequest.PurchaseParams.SourceId!}`);
+            }
         }
     }
 
@@ -120,8 +123,6 @@ export const handlePurchase = async (
     );
     combineInventoryChanges(purchaseResponse.InventoryChanges, inventoryChanges);
 
-    if (!purchaseResponse) throw new Error("purchase response was undefined");
-
     const currencyChanges = updateCurrency(
         inventory,
         purchaseRequest.PurchaseParams.ExpectedPrice,
@@ -149,6 +150,7 @@ export const handlePurchase = async (
                     ];
                 } else {
                     const syndicate = ExportSyndicates[syndicateTag];
+                    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
                     if (syndicate) {
                         const favour = syndicate.favours.find(
                             x => x.storeItem == purchaseRequest.PurchaseParams.StoreItem
@@ -360,6 +362,7 @@ const handleBoosterPackPurchase = async (
     quantity: number
 ): Promise<IPurchaseResponse> => {
     const pack = ExportBoosterPacks[typeName];
+    // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
     if (!pack) {
         throw new Error(`unknown booster pack: ${typeName}`);
     }
diff --git a/src/services/questService.ts b/src/services/questService.ts
index 5e70f502..a9629339 100644
--- a/src/services/questService.ts
+++ b/src/services/questService.ts
@@ -93,7 +93,10 @@ export const updateQuestStage = (
     Object.assign(questStage, questStageUpdate);
 };
 
-export const addQuestKey = (inventory: TInventoryDatabaseDocument, questKey: IQuestKeyDatabase) => {
+export const addQuestKey = (
+    inventory: TInventoryDatabaseDocument,
+    questKey: IQuestKeyDatabase
+): IQuestKeyClient | undefined => {
     if (inventory.QuestKeys.some(q => q.ItemType === questKey.ItemType)) {
         logger.warn(`Quest key ${questKey.ItemType} already exists. It will not be added`);
         return;
@@ -115,7 +118,7 @@ export const addQuestKey = (inventory: TInventoryDatabaseDocument, questKey: IQu
     return inventory.QuestKeys[index - 1].toJSON<IQuestKeyClient>();
 };
 
-export const completeQuest = async (inventory: TInventoryDatabaseDocument, questKey: string) => {
+export const completeQuest = async (inventory: TInventoryDatabaseDocument, questKey: string): Promise<void> => {
     // eslint-disable-next-line @typescript-eslint/no-unnecessary-condition
     const chainStages = ExportKeys[questKey]?.chainStages;
 
diff --git a/src/services/shipService.ts b/src/services/shipService.ts
index 0925a409..cc97d52d 100644
--- a/src/services/shipService.ts
+++ b/src/services/shipService.ts
@@ -1,11 +1,10 @@
-import { Ship } from "@/src/models/shipModel";
-import { ILoadoutDatabase } from "@/src/types/saveLoadoutTypes";
+import { Ship, TShipDatabaseDocument } from "@/src/models/shipModel";
 import { Types } from "mongoose";
 
 export const createShip = async (
     accountOwnerId: Types.ObjectId,
     typeName: string = "/Lotus/Types/Items/Ships/DefaultShip"
-) => {
+): Promise<Types.ObjectId> => {
     try {
         const ship = new Ship({
             ItemType: typeName,
@@ -21,7 +20,7 @@ export const createShip = async (
     }
 };
 
-export const getShip = async (shipId: Types.ObjectId, fieldSelection: string = "") => {
+export const getShip = async (shipId: Types.ObjectId, fieldSelection: string = ""): Promise<TShipDatabaseDocument> => {
     const ship = await Ship.findOne({ _id: shipId }, fieldSelection);
 
     if (!ship) {
@@ -30,15 +29,3 @@ export const getShip = async (shipId: Types.ObjectId, fieldSelection: string = "
 
     return ship;
 };
-
-export const getShipLean = async (shipOwnerId: string) => {
-    const ship = await Ship.findOne({ ShipOwnerId: shipOwnerId }).lean().populate<{
-        LoadOutInventory: { LoadOutPresets: ILoadoutDatabase };
-    }>("LoadOutInventory.LoadOutPresets");
-
-    if (!ship) {
-        throw new Error(`error finding a ship for account ${shipOwnerId}`);
-    }
-
-    return ship;
-};
diff --git a/src/services/statsService.ts b/src/services/statsService.ts
index 49bcea3f..75a05627 100644
--- a/src/services/statsService.ts
+++ b/src/services/statsService.ts
@@ -82,7 +82,6 @@ export const updateStats = async (playerStats: TStatsDatabaseDocument, payload:
                             for (const [type, scans] of Object.entries(data as IUploadEntry)) {
                                 const scan = playerStats.Scans.find(element => element.type === type);
                                 if (scan) {
-                                    scan.scans ??= 0;
                                     scan.scans += scans;
                                 } else {
                                     playerStats.Scans.push({ type: type, scans });
@@ -95,7 +94,6 @@ export const updateStats = async (playerStats: TStatsDatabaseDocument, payload:
                             for (const [type, used] of Object.entries(data as IUploadEntry)) {
                                 const ability = playerStats.Abilities.find(element => element.type === type);
                                 if (ability) {
-                                    ability.used ??= 0;
                                     ability.used += used;
                                 } else {
                                     playerStats.Abilities.push({ type: type, used });
@@ -307,22 +305,20 @@ export const updateStats = async (playerStats: TStatsDatabaseDocument, payload:
                 for (const [category, value] of Object.entries(actionData as IStatsSet)) {
                     switch (category) {
                         case "ELO_RATING":
-                            playerStats.Rating = value;
+                            playerStats.Rating = value as number;
                             break;
 
                         case "RANK":
-                            playerStats.Rank = value;
+                            playerStats.Rank = value as number;
                             break;
 
                         case "PLAYER_LEVEL":
-                            playerStats.PlayerLevel = value;
+                            playerStats.PlayerLevel = value as number;
                             break;
 
                         default:
                             if (!ignoredCategories.includes(category)) {
-                                if (!unknownCategories[action]) {
-                                    unknownCategories[action] = [];
-                                }
+                                unknownCategories[action] ??= [];
                                 unknownCategories[action].push(category);
                             }
                             break;
diff --git a/src/types/personalRoomsTypes.ts b/src/types/personalRoomsTypes.ts
index f91a5b88..cfb98ae7 100644
--- a/src/types/personalRoomsTypes.ts
+++ b/src/types/personalRoomsTypes.ts
@@ -7,7 +7,7 @@ import {
     ITailorShopDatabase,
     TBootLocation
 } from "@/src/types/shipTypes";
-import { Model, Types } from "mongoose";
+import { Document, Model, Types } from "mongoose";
 
 export interface IOrbiter {
     Features: string[];
@@ -48,3 +48,15 @@ export type PersonalRoomsDocumentProps = {
 
 // eslint-disable-next-line @typescript-eslint/ban-types
 export type PersonalRoomsModelType = Model<IPersonalRoomsDatabase, {}, PersonalRoomsDocumentProps>;
+
+// eslint-disable-next-line @typescript-eslint/ban-types
+export type TPersonalRoomsDatabaseDocument = Document<unknown, {}, IPersonalRoomsDatabase> &
+    Omit<
+        IPersonalRoomsDatabase & {
+            _id: Types.ObjectId;
+        } & {
+            __v: number;
+        },
+        keyof PersonalRoomsDocumentProps
+    > &
+    PersonalRoomsDocumentProps;
diff --git a/src/types/session.ts b/src/types/session.ts
index 2e534f70..d7f6e68a 100644
--- a/src/types/session.ts
+++ b/src/types/session.ts
@@ -1,29 +1,29 @@
 export interface ISession {
     sessionId: string;
     creatorId: string;
-    maxPlayers: number;
-    minPlayers: number;
-    privateSlots: number;
-    scoreLimit: number;
-    timeLimit: number;
-    gameModeId: number;
-    eloRating: number;
-    regionId: number;
-    difficulty: number;
-    hasStarted: boolean;
-    enableVoice: boolean;
-    matchType: string;
-    maps: string[];
-    originalSessionId: string;
-    customSettings: string;
-    rewardSeed: number;
-    guildId: string;
-    buildId: number;
-    platform: number;
-    xplatform: boolean;
-    freePublic: number;
-    freePrivate: number;
-    fullReset: number;
+    maxPlayers?: number;
+    minPlayers?: number;
+    privateSlots?: number;
+    scoreLimit?: number;
+    timeLimit?: number;
+    gameModeId?: number;
+    eloRating?: number;
+    regionId?: number;
+    difficulty?: number;
+    hasStarted?: boolean;
+    enableVoice?: boolean;
+    matchType?: string;
+    maps?: string[];
+    originalSessionId?: string;
+    customSettings?: string;
+    rewardSeed?: number;
+    guildId?: string;
+    buildId?: number;
+    platform?: number;
+    xplatform?: boolean;
+    freePublic?: number;
+    freePrivate?: number;
+    fullReset?: number;
 }
 
 export interface IFindSessionRequest {