diff --git a/src/lib/db/client-instance-store.ts b/src/lib/db/client-instance-store.ts
index 516259153e..1ec463c7bc 100644
--- a/src/lib/db/client-instance-store.ts
+++ b/src/lib/db/client-instance-store.ts
@@ -21,17 +21,18 @@ const COLUMNS = [
 ];
 const TABLE = 'client_instances';
 
-const mapRow = (row) => ({
+const mapRow = (row): IClientInstance => ({
     appName: row.app_name,
     instanceId: row.instance_id,
     sdkVersion: row.sdk_version,
+    sdkType: row.sdk_type, // should we add this?
     clientIp: row.client_ip,
     lastSeen: row.last_seen,
     createdAt: row.created_at,
     environment: row.environment,
 });
 
-const mapToDb = (client) => ({
+const mapToDb = (client: INewClientInstance) => ({
     app_name: client.appName,
     instance_id: client.instanceId,
     sdk_version: client.sdkVersion || '',
diff --git a/src/lib/types/stores/client-instance-store.ts b/src/lib/types/stores/client-instance-store.ts
index 36695cd474..eead0fbbc0 100644
--- a/src/lib/types/stores/client-instance-store.ts
+++ b/src/lib/types/stores/client-instance-store.ts
@@ -11,6 +11,7 @@ export interface INewClientInstance {
     clientIp?: string;
     lastSeen?: Date;
     environment?: string;
+    sdkType?: 'backend' | 'frontend' | null;
 }
 export interface IClientInstanceStore
     extends Store<
diff --git a/src/test/e2e/stores/client-instance-store.e2e.test.ts b/src/test/e2e/stores/client-instance-store.e2e.test.ts
new file mode 100644
index 0000000000..3e89a4ef17
--- /dev/null
+++ b/src/test/e2e/stores/client-instance-store.e2e.test.ts
@@ -0,0 +1,60 @@
+import faker from 'faker';
+import dbInit, { type ITestDb } from '../helpers/database-init.js';
+import getLogger from '../../fixtures/no-logger.js';
+import type {
+    IClientInstanceStore,
+    IUnleashStores,
+} from '../../../lib/types/index.js';
+import type { INewClientInstance } from '../../../lib/types/stores/client-instance-store.js';
+
+let db: ITestDb;
+let stores: IUnleashStores;
+let clientInstanceStore: IClientInstanceStore;
+
+beforeAll(async () => {
+    db = await dbInit('client_application_store_e2e_serial', getLogger);
+    stores = db.stores;
+    clientInstanceStore = stores.clientInstanceStore;
+});
+
+afterAll(async () => {
+    await db.destroy();
+});
+
+test('Upserting an application keeps values not provided intact', async () => {
+    const clientInstance: INewClientInstance = {
+        appName: faker.internet.domainName(),
+        instanceId: faker.datatype.uuid(),
+        environment: 'development',
+        sdkVersion: 'unleash-client-node:6.6.0',
+        sdkType: 'backend',
+    };
+    await clientInstanceStore.insert(clientInstance);
+
+    const initial = await clientInstanceStore.get(clientInstance);
+
+    expect(initial).toMatchObject(clientInstance);
+
+    const update: INewClientInstance = {
+        appName: clientInstance.appName,
+        instanceId: clientInstance.instanceId,
+        environment: clientInstance.environment,
+        clientIp: '::2',
+    };
+
+    await clientInstanceStore.insert(update);
+
+    const updated = await clientInstanceStore.get(clientInstance);
+
+    const expectedAfterUpdate = {
+        clientIp: '::2',
+        sdkVersion: 'unleash-client-node:6.6.0',
+        sdkType: 'backend',
+    };
+    expect(updated).toMatchObject(expectedAfterUpdate);
+
+    await clientInstanceStore.bulkUpsert([clientInstance]);
+    const doubleUpdated = await clientInstanceStore.get(clientInstance);
+
+    expect(doubleUpdated).toMatchObject(expectedAfterUpdate);
+});