diff --git a/backend/src/controller/startController.ts b/backend/src/controller/startController.ts
index 7198d900f..a2994f9d4 100644
--- a/backend/src/controller/startController.ts
+++ b/backend/src/controller/startController.ts
@@ -1,7 +1,8 @@
 import { Response } from 'express';
 
 import { StartGetRequest } from '@src/models/api/StartGetRequest';
-import { LEVEL_NAMES } from '@src/models/level';
+import { ChatModel } from '@src/models/chat';
+import { LEVEL_NAMES, LevelState } from '@src/models/level';
 import { getValidOpenAIModels } from '@src/openai';
 import {
 	systemRoleLevel1,
@@ -11,6 +12,14 @@ import {
 
 import { sendErrorResponse } from './handleError';
 
+declare module 'express-session' {
+	interface Session {
+		initialised: boolean;
+		chatModel: ChatModel;
+		levelState: LevelState[];
+	}
+}
+
 function handleStart(req: StartGetRequest, res: Response) {
 	const { level } = req.query;
 
diff --git a/backend/test/integration/chatController.test.ts b/backend/test/integration/chatController.test.ts
index 51f582eaf..d01cd7594 100644
--- a/backend/test/integration/chatController.test.ts
+++ b/backend/test/integration/chatController.test.ts
@@ -16,12 +16,6 @@ declare module 'express-session' {
 		chatModel: ChatModel;
 		levelState: LevelState[];
 	}
-	interface LevelState {
-		level: LEVEL_NAMES;
-		chatHistory: ChatMessage[];
-		defences: Defence[];
-		sentEmails: EmailInfo[];
-	}
 }
 
 // mock the api call
diff --git a/backend/test/unit/controller/chatController.test.ts b/backend/test/unit/controller/chatController.test.ts
index a0a44b62d..8bbe67ed0 100644
--- a/backend/test/unit/controller/chatController.test.ts
+++ b/backend/test/unit/controller/chatController.test.ts
@@ -32,12 +32,6 @@ declare module 'express-session' {
 		chatModel: ChatModel;
 		levelState: LevelState[];
 	}
-	interface LevelState {
-		level: LEVEL_NAMES;
-		chatHistory: ChatMessage[];
-		defences: Defence[];
-		sentEmails: EmailInfo[];
-	}
 }
 
 jest.mock('@src/openai');
diff --git a/backend/test/unit/controller/defenceController.test.ts b/backend/test/unit/controller/defenceController.test.ts
index 5ed392cf9..ccbb16641 100644
--- a/backend/test/unit/controller/defenceController.test.ts
+++ b/backend/test/unit/controller/defenceController.test.ts
@@ -8,7 +8,7 @@ import { ChatModel } from '@src/models/chat';
 import { ChatMessage } from '@src/models/chatMessage';
 import { DEFENCE_ID, Defence } from '@src/models/defence';
 import { EmailInfo } from '@src/models/email';
-import { LEVEL_NAMES } from '@src/models/level';
+import { LEVEL_NAMES, LevelState } from '@src/models/level';
 
 declare module 'express-session' {
 	interface Session {
@@ -16,12 +16,6 @@ declare module 'express-session' {
 		chatModel: ChatModel;
 		levelState: LevelState[];
 	}
-	interface LevelState {
-		level: LEVEL_NAMES;
-		chatHistory: ChatMessage[];
-		defences: Defence[];
-		sentEmails: EmailInfo[];
-	}
 }
 
 jest.mock('@src/defence');
diff --git a/backend/test/unit/controller/emailController.test.ts b/backend/test/unit/controller/emailController.test.ts
index 6c44a4d84..ec6db1b35 100644
--- a/backend/test/unit/controller/emailController.test.ts
+++ b/backend/test/unit/controller/emailController.test.ts
@@ -4,10 +4,8 @@ import { Response } from 'express';
 import { handleClearEmails } from '@src/controller/emailController';
 import { EmailClearRequest } from '@src/models/api/EmailClearRequest';
 import { ChatModel } from '@src/models/chat';
-import { ChatMessage } from '@src/models/chatMessage';
-import { Defence } from '@src/models/defence';
 import { EmailInfo } from '@src/models/email';
-import { LEVEL_NAMES } from '@src/models/level';
+import { LevelState } from '@src/models/level';
 
 declare module 'express-session' {
 	interface Session {
@@ -15,12 +13,6 @@ declare module 'express-session' {
 		chatModel: ChatModel;
 		levelState: LevelState[];
 	}
-	interface LevelState {
-		level: LEVEL_NAMES;
-		chatHistory: ChatMessage[];
-		defences: Defence[];
-		sentEmails: EmailInfo[];
-	}
 }
 
 function responseMock() {
diff --git a/backend/test/unit/controller/levelController.test.ts b/backend/test/unit/controller/levelController.test.ts
index 636dfbb91..3d2df5d41 100644
--- a/backend/test/unit/controller/levelController.test.ts
+++ b/backend/test/unit/controller/levelController.test.ts
@@ -3,25 +3,6 @@ import { Response } from 'express';
 
 import { handleLoadLevel } from '@src/controller/levelController';
 import { LevelGetRequest } from '@src/models/api/LevelGetRequest';
-import { ChatModel } from '@src/models/chat';
-import { ChatMessage } from '@src/models/chatMessage';
-import { Defence } from '@src/models/defence';
-import { EmailInfo } from '@src/models/email';
-import { LEVEL_NAMES } from '@src/models/level';
-
-declare module 'express-session' {
-	interface Session {
-		initialised: boolean;
-		chatModel: ChatModel;
-		levelState: LevelState[];
-	}
-	interface LevelState {
-		level: LEVEL_NAMES;
-		chatHistory: ChatMessage[];
-		defences: Defence[];
-		sentEmails: EmailInfo[];
-	}
-}
 
 jest.mock('@src/promptTemplates', () => ({
 	systemRoleLevel1: 'systemRoleLevel1',
diff --git a/backend/test/unit/controller/resetController.test.ts b/backend/test/unit/controller/resetController.test.ts
index 6a5807f4e..69902b805 100644
--- a/backend/test/unit/controller/resetController.test.ts
+++ b/backend/test/unit/controller/resetController.test.ts
@@ -19,13 +19,8 @@ declare module 'express-session' {
 		chatModel: ChatModel;
 		levelState: LevelState[];
 	}
-	interface LevelState {
-		level: LEVEL_NAMES;
-		chatHistory: ChatMessage[];
-		defences: Defence[];
-		sentEmails: EmailInfo[];
-	}
 }
+
 function responseMock() {
 	return {
 		send: jest.fn(),
diff --git a/backend/test/unit/controller/startController.test.ts b/backend/test/unit/controller/startController.test.ts
index 77751f15d..eb5204f20 100644
--- a/backend/test/unit/controller/startController.test.ts
+++ b/backend/test/unit/controller/startController.test.ts
@@ -3,25 +3,6 @@ import { Response } from 'express';
 
 import { handleStart } from '@src/controller/startController';
 import { StartGetRequest } from '@src/models/api/StartGetRequest';
-import { ChatModel } from '@src/models/chat';
-import { ChatMessage } from '@src/models/chatMessage';
-import { Defence } from '@src/models/defence';
-import { EmailInfo } from '@src/models/email';
-import { LEVEL_NAMES } from '@src/models/level';
-
-declare module 'express-session' {
-	interface Session {
-		initialised: boolean;
-		chatModel: ChatModel;
-		levelState: LevelState[];
-	}
-	interface LevelState {
-		level: LEVEL_NAMES;
-		chatHistory: ChatMessage[];
-		defences: Defence[];
-		sentEmails: EmailInfo[];
-	}
-}
 
 jest.mock('@src/promptTemplates', () => ({
 	systemRoleLevel1: 'systemRoleLevel1',