diff --git a/src/database/main.ts b/src/database/main.ts
index 8da2766..2a823d9 100644
--- a/src/database/main.ts
+++ b/src/database/main.ts
@@ -17,8 +17,6 @@
 
 import * as Sequelize from 'sequelize'
 import { AddDeviceTokenModelStatic, createAddDeviceTokenModel } from './adddevicetoken'
-import { AppModelStatic, createAppModel } from './app'
-import { AppActivityModelStatic, createAppActivityModel } from './appactivity'
 import { AuthTokenModelStatic, createAuthtokenModel } from './authtoken'
 import { CategoryModelStatic, createCategoryModel } from './category'
 import { CategoryAppModelStatic, createCategoryAppModel } from './categoryapp'
@@ -49,8 +47,6 @@ export type Transaction = Sequelize.Transaction
 export interface Database {
   addDeviceToken: AddDeviceTokenModelStatic
   authtoken: AuthTokenModelStatic
-  app: AppModelStatic
-  appActivity: AppActivityModelStatic
   category: CategoryModelStatic
   categoryApp: CategoryAppModelStatic
   categoryNetworkId: CategoryNetworkIdModelStatic
@@ -87,8 +83,6 @@ interface TransactionOptions {
 const createDatabase = (sequelize: Sequelize.Sequelize): Database => ({
   addDeviceToken: createAddDeviceTokenModel(sequelize),
   authtoken: createAuthtokenModel(sequelize),
-  app: createAppModel(sequelize),
-  appActivity: createAppActivityModel(sequelize),
   category: createCategoryModel(sequelize),
   categoryApp: createCategoryAppModel(sequelize),
   childTask: createChildTaskModel(sequelize),
diff --git a/src/database/migration/migrations/20221114-remove-apps-and-activities.ts b/src/database/migration/migrations/20221114-remove-apps-and-activities.ts
new file mode 100644
index 0000000..56ac13b
--- /dev/null
+++ b/src/database/migration/migrations/20221114-remove-apps-and-activities.ts
@@ -0,0 +1,31 @@
+/*
+ * server component for the TimeLimit App
+ * Copyright (C) 2019 - 2022 Jonas Lochmann
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, version 3 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import { QueryInterface, Sequelize, Transaction } from 'sequelize'
+
+export async function up (queryInterface: QueryInterface, sequelize: Sequelize) {
+  await sequelize.transaction({
+    type: Transaction.TYPES.EXCLUSIVE
+  }, async (transaction) => {
+    await queryInterface.dropTable('Apps', { transaction })
+    await queryInterface.dropTable('AppActivities', { transaction })
+  })
+}
+
+export async function down() {
+  throw new Error('not possible')
+}
diff --git a/src/function/cleanup/delete-families.ts b/src/function/cleanup/delete-families.ts
index a16ab37..514a553 100644
--- a/src/function/cleanup/delete-families.ts
+++ b/src/function/cleanup/delete-families.ts
@@ -1,6 +1,6 @@
 /*
  * server component for the TimeLimit App
- * Copyright (C) 2019 - 2020 Jonas Lochmann
+ * Copyright (C) 2019 - 2022 Jonas Lochmann
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as
@@ -29,26 +29,6 @@ export async function deleteFamilies ({ database, familiyIds }: {
   }
 
   await database.transaction(async (transaction) => {
-    // app
-    await database.app.destroy({
-      where: {
-        familyId: {
-          [Sequelize.Op.in]: familiyIds
-        }
-      },
-      transaction
-    })
-
-    // app activity
-    await database.appActivity.destroy({
-      where: {
-        familyId: {
-          [Sequelize.Op.in]: familiyIds
-        }
-      },
-      transaction
-    })
-
     // category
     await database.category.destroy({
       where: {
diff --git a/src/function/device/remove-device.ts b/src/function/device/remove-device.ts
index 840cbe3..87e09db 100644
--- a/src/function/device/remove-device.ts
+++ b/src/function/device/remove-device.ts
@@ -40,23 +40,6 @@ export async function removeDevice ({ database, familyId, deviceId, websocket, t
     throw new Conflict()
   }
 
-  // remove app entries
-  await database.app.destroy({
-    where: {
-      familyId,
-      deviceId
-    },
-    transaction
-  })
-
-  await database.appActivity.destroy({
-    where: {
-      familyId,
-      deviceId
-    },
-    transaction
-  })
-
   // remove as current device
   await database.user.update({
     currentDevice: ''
diff --git a/src/function/sync/apply-actions/dispatch-app-logic-action/addinstalledapps.ts b/src/function/sync/apply-actions/dispatch-app-logic-action/addinstalledapps.ts
index 708c9a6..beead96 100644
--- a/src/function/sync/apply-actions/dispatch-app-logic-action/addinstalledapps.ts
+++ b/src/function/sync/apply-actions/dispatch-app-logic-action/addinstalledapps.ts
@@ -15,49 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import * as Sequelize from 'sequelize'
 import { AddInstalledAppsAction } from '../../../../action'
-import { AppAttributes, maxPackageNameLength } from '../../../../database/app'
 import { Cache } from '../cache'
-import { ApplyActionException } from '../exception'
 
-export async function dispatchAddInstalledApps ({ deviceId, action, cache }: {
+export async function dispatchAddInstalledApps (_: {
   deviceId: string
   action: AddInstalledAppsAction
   cache: Cache
 }) {
-  action.apps.forEach((app) => {
-    if (app.packageName.length > maxPackageNameLength) {
-      throw new ApplyActionException({
-        staticMessage: 'package name too long',
-        dynamicMessage: 'package name too long: ' + app.packageName
-      })
-    }
-  })
-
-  await cache.database.app.destroy({
-    where: {
-      familyId: cache.familyId,
-      deviceId,
-      packageName: {
-        [Sequelize.Op.in]: action.apps.map((app) => app.packageName)
-      }
-    },
-    transaction: cache.transaction
-  })
-
-  await cache.database.app.bulkCreate(
-    action.apps.map((app): AppAttributes => ({
-      familyId: cache.familyId,
-      deviceId,
-      packageName: app.packageName,
-      title: app.title,
-      isLaunchable: app.isLaunchable,
-      recommendation: app.recommendation
-    })),
-    { transaction: cache.transaction }
-  )
-
-  cache.devicesWithModifiedInstalledApps.add(deviceId)
-  cache.incrementTriggeredSyncLevel(1)
+  // do nothing
 }
diff --git a/src/function/sync/apply-actions/dispatch-app-logic-action/removeinstalledapps.ts b/src/function/sync/apply-actions/dispatch-app-logic-action/removeinstalledapps.ts
index aa28b34..3ada864 100644
--- a/src/function/sync/apply-actions/dispatch-app-logic-action/removeinstalledapps.ts
+++ b/src/function/sync/apply-actions/dispatch-app-logic-action/removeinstalledapps.ts
@@ -15,26 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import * as Sequelize from 'sequelize'
 import { RemoveInstalledAppsAction } from '../../../../action'
 import { Cache } from '../cache'
 
-export async function dispatchRemoveInstalledApps ({ deviceId, action, cache }: {
+export async function dispatchRemoveInstalledApps (_: {
   deviceId: string
   action: RemoveInstalledAppsAction
   cache: Cache
 }) {
-  await cache.database.app.destroy({
-    where: {
-      familyId: cache.familyId,
-      deviceId,
-      packageName: {
-        [Sequelize.Op.in]: action.packageNames
-      }
-    },
-    transaction: cache.transaction
-  })
-
-  cache.devicesWithModifiedInstalledApps.add(deviceId)
-  cache.incrementTriggeredSyncLevel(1)
+  // do nothing
 }
diff --git a/src/function/sync/apply-actions/dispatch-app-logic-action/updateappactivities.ts b/src/function/sync/apply-actions/dispatch-app-logic-action/updateappactivities.ts
index 55cbfb1..cbe08b1 100644
--- a/src/function/sync/apply-actions/dispatch-app-logic-action/updateappactivities.ts
+++ b/src/function/sync/apply-actions/dispatch-app-logic-action/updateappactivities.ts
@@ -15,85 +15,13 @@
  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  */
 
-import { chunk } from 'lodash'
-import * as Sequelize from 'sequelize'
 import { UpdateAppActivitiesAction } from '../../../../action'
-import { AppActivityAttributes, maxActivityNameLength, maxPackageNameLength } from '../../../../database/appactivity'
 import { Cache } from '../cache'
-import { ApplyActionException } from '../exception'
 
-export async function dispatchUpdateAppActivities ({ deviceId, action, cache }: {
+export async function dispatchUpdateAppActivities (_: {
   deviceId: string
   action: UpdateAppActivitiesAction
   cache: Cache
 }) {
-  action.updatedOrAdded.forEach((app) => {
-    if (app.packageName.length > maxPackageNameLength) {
-      throw new ApplyActionException({
-        staticMessage: 'package name too long',
-        dynamicMessage: 'package name too long: ' + app.packageName
-      })
-    }
-
-    if (app.activityName.length > maxActivityNameLength) {
-      throw new ApplyActionException({
-        staticMessage: 'activity name too long',
-        dynamicMessage: 'activity name too long: ' + app.activityName
-      })
-    }
-  })
-
-  if (action.updatedOrAdded.length > 0) {
-    const chuncks = chunk(action.updatedOrAdded, 500)
-
-    for (const items of chuncks) {
-      await cache.database.appActivity.destroy({
-        where: {
-          familyId: cache.familyId,
-          deviceId,
-          [Sequelize.Op.or]: (
-            items.map((item) => ({
-              packageName: item.packageName,
-              activityName: item.activityName
-            }))
-          )
-        },
-        transaction: cache.transaction
-      })
-    }
-
-    await cache.database.appActivity.bulkCreate(
-      action.updatedOrAdded.map((item): AppActivityAttributes => ({
-        familyId: cache.familyId,
-        deviceId,
-        packageName: item.packageName,
-        activityName: item.activityName,
-        title: item.title
-      })),
-      { transaction: cache.transaction }
-    )
-  }
-
-  if (action.removed.length > 0) {
-    const chunks = chunk(action.removed, 500)
-
-    for (const items of chunks) {
-      await cache.database.appActivity.destroy({
-        where: {
-          familyId: cache.familyId,
-          deviceId,
-          [Sequelize.Op.or]: (
-            items.map((item) => ({
-              packageName: item.packageName,
-              activityName: item.activityName
-            }))
-          )
-        },
-        transaction: cache.transaction
-      })
-    }
-  }
-
-  cache.devicesWithModifiedInstalledApps.add(deviceId)
-  cache.incrementTriggeredSyncLevel(1)
+  // do nothing
 }
diff --git a/src/function/sync/apply-actions/dispatch-app-logic-action/updateinstalledapps.ts b/src/function/sync/apply-actions/dispatch-app-logic-action/updateinstalledapps.ts
index 6fac11f..bde22e9 100644
--- a/src/function/sync/apply-actions/dispatch-app-logic-action/updateinstalledapps.ts
+++ b/src/function/sync/apply-actions/dispatch-app-logic-action/updateinstalledapps.ts
@@ -16,44 +16,12 @@
  */
 
 import { UpdateInstalledAppsAction } from '../../../../action'
-import { types } from '../../../../database/encryptedapplist'
-import { generateVersionId } from '../../../../util/token'
 import { Cache } from '../cache'
 
-export async function dispatchUpdateInstalledApps ({ deviceId, action, cache }: {
+export async function dispatchUpdateInstalledApps (_: {
   deviceId: string
   action: UpdateInstalledAppsAction
   cache: Cache
 }) {
-  async function upsert({ type, data }: { type: number, data: Buffer }) {
-    await cache.database.encryptedAppList.upsert({
-      familyId: cache.familyId,
-      deviceId,
-      type,
-      version: generateVersionId(),
-      data
-    }, { transaction: cache.transaction })
-  }
-
-  if (action.base) {
-    await upsert({ type: types.base, data: action.base })
-  }
-
-  if (action.diff) {
-    await upsert({ type: types.diff, data: action.diff })
-  }
-
-  if (action.wipe) {
-    await cache.database.app.destroy({
-      where: {
-        familyId: cache.familyId,
-        deviceId
-      },
-      transaction: cache.transaction
-    })
-
-    cache.devicesWithModifiedInstalledApps.add(deviceId)
-  }
-
-  cache.incrementTriggeredSyncLevel(1)
+  // do nothing
 }