diff --git a/packages/backend/src/models/app-auth-client.ts b/packages/backend/src/models/app-auth-client.js
similarity index 75%
rename from packages/backend/src/models/app-auth-client.ts
rename to packages/backend/src/models/app-auth-client.js
index cc442580..3f069874 100644
--- a/packages/backend/src/models/app-auth-client.ts
+++ b/packages/backend/src/models/app-auth-client.js
@@ -1,19 +1,9 @@
-import { IJSONObject } from '@automatisch/types';
 import { AES, enc } from 'crypto-js';
-import { ModelOptions, QueryContext } from 'objection';
 import appConfig from '../config/app';
 import AppConfig from './app-config';
 import Base from './base';
 
 class AppAuthClient extends Base {
-  id!: string;
-  name: string;
-  active: boolean;
-  appConfigId!: string;
-  authDefaults: string;
-  formattedAuthDefaults?: IJSONObject;
-  appConfig?: AppConfig;
-
   static tableName = 'app_auth_clients';
 
   static jsonSchema = {
@@ -42,7 +32,7 @@ class AppAuthClient extends Base {
     },
   });
 
-  encryptData(): void {
+  encryptData() {
     if (!this.eligibleForEncryption()) return;
 
     this.authDefaults = AES.encrypt(
@@ -52,7 +42,7 @@ class AppAuthClient extends Base {
 
     delete this.formattedAuthDefaults;
   }
-  decryptData(): void {
+  decryptData() {
     if (!this.eligibleForDecryption()) return;
 
     this.formattedAuthDefaults = JSON.parse(
@@ -60,30 +50,27 @@ class AppAuthClient extends Base {
     );
   }
 
-  eligibleForEncryption(): boolean {
+  eligibleForEncryption() {
     return this.formattedAuthDefaults ? true : false;
   }
 
-  eligibleForDecryption(): boolean {
+  eligibleForDecryption() {
     return this.authDefaults ? true : false;
   }
 
   // TODO: Make another abstraction like beforeSave instead of using
   // beforeInsert and beforeUpdate separately for the same operation.
-  async $beforeInsert(queryContext: QueryContext): Promise<void> {
+  async $beforeInsert(queryContext) {
     await super.$beforeInsert(queryContext);
     this.encryptData();
   }
 
-  async $beforeUpdate(
-    opt: ModelOptions,
-    queryContext: QueryContext
-  ): Promise<void> {
+  async $beforeUpdate(opt, queryContext) {
     await super.$beforeUpdate(opt, queryContext);
     this.encryptData();
   }
 
-  async $afterFind(): Promise<void> {
+  async $afterFind() {
     this.decryptData();
   }
 }
diff --git a/packages/backend/src/models/app-config.ts b/packages/backend/src/models/app-config.js
similarity index 76%
rename from packages/backend/src/models/app-config.ts
rename to packages/backend/src/models/app-config.js
index e34c014d..1e3bda31 100644
--- a/packages/backend/src/models/app-config.ts
+++ b/packages/backend/src/models/app-config.js
@@ -3,14 +3,6 @@ import Base from './base';
 import AppAuthClient from './app-auth-client';
 
 class AppConfig extends Base {
-  id!: string;
-  key!: string;
-  allowCustomConnection: boolean;
-  shared: boolean;
-  disabled: boolean;
-  app?: App;
-  appAuthClients?: AppAuthClient[];
-
   static tableName = 'app_configs';
 
   static jsonSchema = {
@@ -46,16 +38,13 @@ class AppConfig extends Base {
   }
 
   get canConnect() {
-    const hasSomeActiveAppAuthClients = !!this.appAuthClients
-      ?.some(appAuthClient => appAuthClient.active);
+    const hasSomeActiveAppAuthClients = !!this.appAuthClients?.some(
+      (appAuthClient) => appAuthClient.active
+    );
     const shared = this.shared;
     const active = this.disabled === false;
 
-    const conditions = [
-      hasSomeActiveAppAuthClients,
-      shared,
-      active
-    ];
+    const conditions = [hasSomeActiveAppAuthClients, shared, active];
 
     return conditions.every(Boolean);
   }
diff --git a/packages/backend/src/models/app.ts b/packages/backend/src/models/app.js
similarity index 59%
rename from packages/backend/src/models/app.ts
rename to packages/backend/src/models/app.js
index 2755c6a7..6338c107 100644
--- a/packages/backend/src/models/app.ts
+++ b/packages/backend/src/models/app.js
@@ -1,6 +1,5 @@
 import fs from 'fs';
 import { join } from 'path';
-import { IApp } from '@automatisch/types';
 import appInfoConverter from '../helpers/app-info-converter';
 import getApp from '../helpers/get-app';
 
@@ -10,7 +9,7 @@ class App {
     .readdirSync(this.folderPath)
     .filter((file) => fs.statSync(this.folderPath + '/' + file).isDirectory());
 
-  static async findAll(name?: string, stripFuncs = true): Promise<IApp[]> {
+  static async findAll(name, stripFuncs = true) {
     if (!name)
       return Promise.all(
         this.list.map(
@@ -25,39 +24,45 @@ class App {
     );
   }
 
-  static async findOneByName(name: string, stripFuncs = false): Promise<IApp> {
+  static async findOneByName(name, stripFuncs = false) {
     const rawAppData = await getApp(name.toLocaleLowerCase(), stripFuncs);
 
     return appInfoConverter(rawAppData);
   }
 
-  static async findOneByKey(key: string, stripFuncs = false): Promise<IApp> {
+  static async findOneByKey(key, stripFuncs = false) {
     const rawAppData = await getApp(key, stripFuncs);
 
     return appInfoConverter(rawAppData);
   }
 
-  static async checkAppAndAction(appKey: string, actionKey: string): Promise<void> {
+  static async checkAppAndAction(appKey, actionKey) {
     const app = await this.findOneByKey(appKey);
 
     if (!actionKey) return;
 
-    const hasAction = app.actions?.find(action => action.key === actionKey);
+    const hasAction = app.actions?.find((action) => action.key === actionKey);
 
     if (!hasAction) {
-      throw new Error(`${app.name} does not have an action with the "${actionKey}" key!`);
+      throw new Error(
+        `${app.name} does not have an action with the "${actionKey}" key!`
+      );
     }
   }
 
-  static async checkAppAndTrigger(appKey: string, triggerKey: string): Promise<void> {
+  static async checkAppAndTrigger(appKey, triggerKey) {
     const app = await this.findOneByKey(appKey);
 
     if (!triggerKey) return;
 
-    const hasTrigger = app.triggers?.find(trigger => trigger.key === triggerKey);
+    const hasTrigger = app.triggers?.find(
+      (trigger) => trigger.key === triggerKey
+    );
 
     if (!hasTrigger) {
-      throw new Error(`${app.name} does not have a trigger with the "${triggerKey}" key!`);
+      throw new Error(
+        `${app.name} does not have a trigger with the "${triggerKey}" key!`
+      );
     }
   }
 }
diff --git a/packages/backend/src/models/base.ts b/packages/backend/src/models/base.js
similarity index 65%
rename from packages/backend/src/models/base.ts
rename to packages/backend/src/models/base.js
index bbc916f4..2b1a6e5c 100644
--- a/packages/backend/src/models/base.ts
+++ b/packages/backend/src/models/base.js
@@ -1,18 +1,12 @@
 import { AjvValidator, Model, snakeCaseMappers } from 'objection';
-import type { QueryContext, ModelOptions, ColumnNameMappers } from 'objection';
 import addFormats from 'ajv-formats';
 
 import ExtendedQueryBuilder from './query-builder';
 
 class Base extends Model {
-  createdAt!: string;
-  updatedAt!: string;
-  deletedAt: string;
-
-  QueryBuilderType!: ExtendedQueryBuilder<this>;
   static QueryBuilder = ExtendedQueryBuilder;
 
-  static get columnNameMappers(): ColumnNameMappers {
+  static get columnNameMappers() {
     return snakeCaseMappers();
   }
 
@@ -29,17 +23,14 @@ class Base extends Model {
     });
   }
 
-  async $beforeInsert(queryContext: QueryContext): Promise<void> {
+  async $beforeInsert(queryContext) {
     await super.$beforeInsert(queryContext);
 
     this.createdAt = new Date().toISOString();
     this.updatedAt = new Date().toISOString();
   }
 
-  async $beforeUpdate(
-    opts: ModelOptions,
-    queryContext: QueryContext
-  ): Promise<void> {
+  async $beforeUpdate(opts, queryContext) {
     this.updatedAt = new Date().toISOString();
 
     await super.$beforeUpdate(opts, queryContext);
diff --git a/packages/backend/src/models/config.ts b/packages/backend/src/models/config.js
similarity index 75%
rename from packages/backend/src/models/config.ts
rename to packages/backend/src/models/config.js
index a42b8f9d..303f6d64 100644
--- a/packages/backend/src/models/config.ts
+++ b/packages/backend/src/models/config.js
@@ -1,11 +1,6 @@
-import { IJSONValue } from '@automatisch/types';
 import Base from './base';
 
 class Config extends Base {
-  id!: string;
-  key!: string;
-  value!: { data: IJSONValue };
-
   static tableName = 'config';
 
   static jsonSchema = {
diff --git a/packages/backend/src/models/connection.ts b/packages/backend/src/models/connection.js
similarity index 75%
rename from packages/backend/src/models/connection.ts
rename to packages/backend/src/models/connection.js
index 8fccf88f..2ba8b67b 100644
--- a/packages/backend/src/models/connection.ts
+++ b/packages/backend/src/models/connection.js
@@ -1,36 +1,15 @@
-import { QueryContext, ModelOptions } from 'objection';
-import type { RelationMappings } from 'objection';
 import { AES, enc } from 'crypto-js';
-import { IRequest } from '@automatisch/types';
 import App from './app';
 import AppConfig from './app-config';
 import AppAuthClient from './app-auth-client';
 import Base from './base';
 import User from './user';
 import Step from './step';
-import ExtendedQueryBuilder from './query-builder';
 import appConfig from '../config/app';
-import { IJSONObject } from '@automatisch/types';
 import Telemetry from '../helpers/telemetry';
 import globalVariable from '../helpers/global-variable';
 
 class Connection extends Base {
-  id!: string;
-  key!: string;
-  data: string;
-  formattedData?: IJSONObject;
-  userId!: string;
-  verified: boolean;
-  draft: boolean;
-  count?: number;
-  flowCount?: number;
-  user?: User;
-  steps?: Step[];
-  triggerSteps?: Step[];
-  appAuthClientId?: string;
-  appAuthClient?: AppAuthClient;
-  appConfig?: AppConfig;
-
   static tableName = 'connections';
 
   static jsonSchema = {
@@ -56,7 +35,7 @@ class Connection extends Base {
     return ['reconnectable'];
   }
 
-  static relationMappings = (): RelationMappings => ({
+  static relationMappings = () => ({
     user: {
       relation: Base.BelongsToOneRelation,
       modelClass: User,
@@ -80,7 +59,7 @@ class Connection extends Base {
         from: 'connections.id',
         to: 'steps.connection_id',
       },
-      filter(builder: ExtendedQueryBuilder<Step>) {
+      filter(builder) {
         builder.where('type', '=', 'trigger');
       },
     },
@@ -114,7 +93,7 @@ class Connection extends Base {
     return true;
   }
 
-  encryptData(): void {
+  encryptData() {
     if (!this.eligibleForEncryption()) return;
 
     this.data = AES.encrypt(
@@ -125,7 +104,7 @@ class Connection extends Base {
     delete this.formattedData;
   }
 
-  decryptData(): void {
+  decryptData() {
     if (!this.eligibleForDecryption()) return;
 
     this.formattedData = JSON.parse(
@@ -133,39 +112,36 @@ class Connection extends Base {
     );
   }
 
-  eligibleForEncryption(): boolean {
+  eligibleForEncryption() {
     return this.formattedData ? true : false;
   }
 
-  eligibleForDecryption(): boolean {
+  eligibleForDecryption() {
     return this.data ? true : false;
   }
 
   // TODO: Make another abstraction like beforeSave instead of using
   // beforeInsert and beforeUpdate separately for the same operation.
-  async $beforeInsert(queryContext: QueryContext): Promise<void> {
+  async $beforeInsert(queryContext) {
     await super.$beforeInsert(queryContext);
     this.encryptData();
   }
 
-  async $beforeUpdate(
-    opt: ModelOptions,
-    queryContext: QueryContext
-  ): Promise<void> {
+  async $beforeUpdate(opt, queryContext) {
     await super.$beforeUpdate(opt, queryContext);
     this.encryptData();
   }
 
-  async $afterFind(): Promise<void> {
+  async $afterFind() {
     this.decryptData();
   }
 
-  async $afterInsert(queryContext: QueryContext) {
+  async $afterInsert(queryContext) {
     await super.$afterInsert(queryContext);
     Telemetry.connectionCreated(this);
   }
 
-  async $afterUpdate(opt: ModelOptions, queryContext: QueryContext) {
+  async $afterUpdate(opt, queryContext) {
     await super.$afterUpdate(opt, queryContext);
     Telemetry.connectionUpdated(this);
   }
@@ -176,7 +152,7 @@ class Connection extends Base {
     return await App.findOneByKey(this.key);
   }
 
-  async verifyWebhook(request: IRequest) {
+  async verifyWebhook(request) {
     if (!this.key) return true;
 
     const app = await this.getApp();
diff --git a/packages/backend/src/models/execution-step.ts b/packages/backend/src/models/execution-step.js
similarity index 82%
rename from packages/backend/src/models/execution-step.ts
rename to packages/backend/src/models/execution-step.js
index 61fa6a5b..1cd470f9 100644
--- a/packages/backend/src/models/execution-step.ts
+++ b/packages/backend/src/models/execution-step.js
@@ -1,5 +1,3 @@
-import type { QueryContext } from 'objection';
-import { IJSONObject } from '@automatisch/types';
 import appConfig from '../config/app';
 import Base from './base';
 import Execution from './execution';
@@ -7,17 +5,6 @@ import Step from './step';
 import Telemetry from '../helpers/telemetry';
 
 class ExecutionStep extends Base {
-  id!: string;
-  executionId!: string;
-  stepId!: string;
-  dataIn!: IJSONObject;
-  dataOut!: IJSONObject;
-  errorDetails: IJSONObject;
-  status: 'success' | 'failure';
-  step: Step;
-  execution?: Execution;
-  count?: number;
-
   static tableName = 'execution_steps';
 
   static jsonSchema = {
@@ -60,7 +47,7 @@ class ExecutionStep extends Base {
     return this.status === 'failure';
   }
 
-  async $afterInsert(queryContext: QueryContext) {
+  async $afterInsert(queryContext) {
     await super.$afterInsert(queryContext);
     Telemetry.executionStepCreated(this);
 
diff --git a/packages/backend/src/models/execution.ts b/packages/backend/src/models/execution.js
similarity index 83%
rename from packages/backend/src/models/execution.ts
rename to packages/backend/src/models/execution.js
index 10670138..8f3b1629 100644
--- a/packages/backend/src/models/execution.ts
+++ b/packages/backend/src/models/execution.js
@@ -1,17 +1,9 @@
-import type { QueryContext } from 'objection';
 import Base from './base';
 import Flow from './flow';
 import ExecutionStep from './execution-step';
 import Telemetry from '../helpers/telemetry';
 
 class Execution extends Base {
-  id!: string;
-  flowId!: string;
-  testRun: boolean;
-  internalId: string;
-  executionSteps: ExecutionStep[];
-  flow?: Flow;
-
   static tableName = 'executions';
 
   static jsonSchema = {
@@ -47,7 +39,7 @@ class Execution extends Base {
     },
   });
 
-  async $afterInsert(queryContext: QueryContext) {
+  async $afterInsert(queryContext) {
     await super.$afterInsert(queryContext);
     Telemetry.executionCreated(this);
   }
diff --git a/packages/backend/src/models/flow.ts b/packages/backend/src/models/flow.js
similarity index 76%
rename from packages/backend/src/models/flow.ts
rename to packages/backend/src/models/flow.js
index 81602e3e..3080340a 100644
--- a/packages/backend/src/models/flow.ts
+++ b/packages/backend/src/models/flow.js
@@ -1,10 +1,4 @@
 import { ValidationError } from 'objection';
-import type {
-  ModelOptions,
-  QueryContext,
-  StaticHookArguments,
-} from 'objection';
-import ExtendedQueryBuilder from './query-builder';
 import Base from './base';
 import Step from './step';
 import User from './user';
@@ -12,19 +6,6 @@ import Execution from './execution';
 import Telemetry from '../helpers/telemetry';
 
 class Flow extends Base {
-  id!: string;
-  name!: string;
-  userId!: string;
-  active: boolean;
-  status: 'paused' | 'published' | 'draft';
-  steps: Step[];
-  triggerStep: Step;
-  publishedAt: string;
-  remoteWebhookId: string;
-  executions?: Execution[];
-  lastExecution?: Execution;
-  user?: User;
-
   static tableName = 'flows';
 
   static jsonSchema = {
@@ -52,7 +33,7 @@ class Flow extends Base {
         from: 'flows.id',
         to: 'steps.flow_id',
       },
-      filter(builder: ExtendedQueryBuilder<Step>) {
+      filter(builder) {
         builder.orderBy('position', 'asc');
       },
     },
@@ -63,11 +44,8 @@ class Flow extends Base {
         from: 'flows.id',
         to: 'steps.flow_id',
       },
-      filter(builder: ExtendedQueryBuilder<Step>) {
-        builder
-          .where('type', 'trigger')
-          .limit(1)
-          .first();
+      filter(builder) {
+        builder.where('type', 'trigger').limit(1).first();
       },
     },
     executions: {
@@ -85,7 +63,7 @@ class Flow extends Base {
         from: 'flows.id',
         to: 'executions.flow_id',
       },
-      filter(builder: ExtendedQueryBuilder<Execution>) {
+      filter(builder) {
         builder.orderBy('created_at', 'desc').limit(1).first();
       },
     },
@@ -99,7 +77,7 @@ class Flow extends Base {
     },
   });
 
-  static async afterFind(args: StaticHookArguments<any>): Promise<any> {
+  static async afterFind(args) {
     const { result } = args;
 
     const referenceFlow = result[0];
@@ -122,7 +100,7 @@ class Flow extends Base {
   async lastInternalId() {
     const lastExecution = await this.$relatedQuery('lastExecution');
 
-    return lastExecution ? (lastExecution as Execution).internalId : null;
+    return lastExecution ? lastExecution.internalId : null;
   }
 
   async lastInternalIds(itemCount = 50) {
@@ -134,15 +112,12 @@ class Flow extends Base {
     return lastExecutions.map((execution) => execution.internalId);
   }
 
-  async $beforeUpdate(
-    opt: ModelOptions,
-    queryContext: QueryContext
-  ): Promise<void> {
+  async $beforeUpdate(opt, queryContext) {
     await super.$beforeUpdate(opt, queryContext);
 
     if (!this.active) return;
 
-    const oldFlow = opt.old as Flow;
+    const oldFlow = opt.old;
 
     const incompleteStep = await oldFlow.$relatedQuery('steps').findOne({
       status: 'incomplete',
@@ -168,17 +143,17 @@ class Flow extends Base {
     return;
   }
 
-  async $afterInsert(queryContext: QueryContext) {
+  async $afterInsert(queryContext) {
     await super.$afterInsert(queryContext);
     Telemetry.flowCreated(this);
   }
 
-  async $afterUpdate(opt: ModelOptions, queryContext: QueryContext) {
+  async $afterUpdate(opt, queryContext) {
     await super.$afterUpdate(opt, queryContext);
     Telemetry.flowUpdated(this);
   }
 
-  async getTriggerStep(): Promise<Step> {
+  async getTriggerStep() {
     return await this.$relatedQuery('steps').findOne({
       type: 'trigger',
     });
diff --git a/packages/backend/src/models/identity.ee.ts b/packages/backend/src/models/identity.ee.js
similarity index 79%
rename from packages/backend/src/models/identity.ee.ts
rename to packages/backend/src/models/identity.ee.js
index 68f8ff14..8a66e1bb 100644
--- a/packages/backend/src/models/identity.ee.ts
+++ b/packages/backend/src/models/identity.ee.js
@@ -3,22 +3,11 @@ import SamlAuthProvider from './saml-auth-provider.ee';
 import User from './user';
 
 class Identity extends Base {
-  id!: string;
-  remoteId!: string;
-  userId!: string;
-  providerId!: string;
-  providerType!: 'saml';
-
   static tableName = 'identities';
 
   static jsonSchema = {
     type: 'object',
-    required: [
-      'providerId',
-      'remoteId',
-      'userId',
-      'providerType',
-    ],
+    required: ['providerId', 'remoteId', 'userId', 'providerType'],
 
     properties: {
       id: { type: 'string', format: 'uuid' },
@@ -43,11 +32,10 @@ class Identity extends Base {
       modelClass: SamlAuthProvider,
       join: {
         from: 'saml_auth_providers.id',
-        to: 'identities.provider_id'
+        to: 'identities.provider_id',
       },
     },
   });
-
 }
 
 export default Identity;
diff --git a/packages/backend/src/models/permission.ts b/packages/backend/src/models/permission.js
similarity index 86%
rename from packages/backend/src/models/permission.ts
rename to packages/backend/src/models/permission.js
index 8c5f2784..9bfab2e9 100644
--- a/packages/backend/src/models/permission.ts
+++ b/packages/backend/src/models/permission.js
@@ -1,12 +1,6 @@
 import Base from './base';
 
 class Permission extends Base {
-  id: string;
-  roleId: string;
-  action: string;
-  subject: string;
-  conditions: string[];
-
   static tableName = 'permissions';
 
   static jsonSchema = {
diff --git a/packages/backend/src/models/query-builder.js b/packages/backend/src/models/query-builder.js
new file mode 100644
index 00000000..d3e0a89e
--- /dev/null
+++ b/packages/backend/src/models/query-builder.js
@@ -0,0 +1,58 @@
+import { Model } from 'objection';
+
+const DELETED_COLUMN_NAME = 'deleted_at';
+
+const supportsSoftDeletion = (modelClass) => {
+  return modelClass.jsonSchema.properties.deletedAt;
+};
+
+const buildQueryBuidlerForClass = () => {
+  return (modelClass) => {
+    const qb = Model.QueryBuilder.forClass.call(
+      ExtendedQueryBuilder,
+      modelClass
+    );
+    qb.onBuild((builder) => {
+      if (
+        !builder.context().withSoftDeleted &&
+        supportsSoftDeletion(qb.modelClass())
+      ) {
+        builder.whereNull(
+          `${qb.modelClass().tableName}.${DELETED_COLUMN_NAME}`
+        );
+      }
+    });
+    return qb;
+  };
+};
+
+class ExtendedQueryBuilder extends Model.QueryBuilder {
+  static forClass = buildQueryBuidlerForClass();
+
+  delete() {
+    if (supportsSoftDeletion(this.modelClass())) {
+      return this.patch({
+        [DELETED_COLUMN_NAME]: new Date().toISOString(),
+      });
+    }
+
+    return super.delete();
+  }
+
+  hardDelete() {
+    return super.delete();
+  }
+
+  withSoftDeleted() {
+    this.context().withSoftDeleted = true;
+    return this;
+  }
+
+  restore() {
+    return this.patch({
+      [DELETED_COLUMN_NAME]: null,
+    });
+  }
+}
+
+export default ExtendedQueryBuilder;
diff --git a/packages/backend/src/models/query-builder.ts b/packages/backend/src/models/query-builder.ts
deleted file mode 100644
index 34263d23..00000000
--- a/packages/backend/src/models/query-builder.ts
+++ /dev/null
@@ -1,71 +0,0 @@
-import {
-  Model,
-  Page,
-  ModelClass,
-  PartialModelObject,
-  ForClassMethod,
-  AnyQueryBuilder,
-} from 'objection';
-
-const DELETED_COLUMN_NAME = 'deleted_at';
-
-const supportsSoftDeletion = (modelClass: ModelClass<any>) => {
-  return modelClass.jsonSchema.properties.deletedAt;
-}
-
-const buildQueryBuidlerForClass = (): ForClassMethod => {
-  return (modelClass) => {
-    const qb: AnyQueryBuilder = Model.QueryBuilder.forClass.call(
-      ExtendedQueryBuilder,
-      modelClass
-    );
-    qb.onBuild((builder) => {
-      if (!builder.context().withSoftDeleted && supportsSoftDeletion(qb.modelClass())) {
-        builder.whereNull(
-          `${qb.modelClass().tableName}.${DELETED_COLUMN_NAME}`
-        );
-      }
-    });
-    return qb;
-  };
-};
-
-class ExtendedQueryBuilder<M extends Model, R = M[]> extends Model.QueryBuilder<
-  M,
-  R
-> {
-  ArrayQueryBuilderType!: ExtendedQueryBuilder<M, M[]>;
-  SingleQueryBuilderType!: ExtendedQueryBuilder<M, M>;
-  MaybeSingleQueryBuilderType!: ExtendedQueryBuilder<M, M | undefined>;
-  NumberQueryBuilderType!: ExtendedQueryBuilder<M, number>;
-  PageQueryBuilderType!: ExtendedQueryBuilder<M, Page<M>>;
-
-  static forClass: ForClassMethod = buildQueryBuidlerForClass();
-
-  delete() {
-    if (supportsSoftDeletion(this.modelClass())) {
-      return this.patch({
-        [DELETED_COLUMN_NAME]: new Date().toISOString(),
-      } as unknown as PartialModelObject<M>);
-    }
-
-    return super.delete();
-  }
-
-  hardDelete() {
-    return super.delete();
-  }
-
-  withSoftDeleted() {
-    this.context().withSoftDeleted = true;
-    return this;
-  }
-
-  restore() {
-    return this.patch({
-      [DELETED_COLUMN_NAME]: null,
-    } as unknown as PartialModelObject<M>);
-  }
-}
-
-export default ExtendedQueryBuilder;
diff --git a/packages/backend/src/models/role.ts b/packages/backend/src/models/role.js
similarity index 89%
rename from packages/backend/src/models/role.ts
rename to packages/backend/src/models/role.js
index c2a3666d..d8796058 100644
--- a/packages/backend/src/models/role.ts
+++ b/packages/backend/src/models/role.js
@@ -3,13 +3,6 @@ import Permission from './permission';
 import User from './user';
 
 class Role extends Base {
-  id!: string;
-  name!: string;
-  key: string;
-  description: string;
-  users?: User[];
-  permissions?: Permission[];
-
   static tableName = 'roles';
 
   static jsonSchema = {
diff --git a/packages/backend/src/models/saml-auth-provider.ee.ts b/packages/backend/src/models/saml-auth-provider.ee.js
similarity index 83%
rename from packages/backend/src/models/saml-auth-provider.ee.ts
rename to packages/backend/src/models/saml-auth-provider.ee.js
index 075c87eb..f586ca8e 100644
--- a/packages/backend/src/models/saml-auth-provider.ee.ts
+++ b/packages/backend/src/models/saml-auth-provider.ee.js
@@ -1,25 +1,10 @@
 import { URL } from 'node:url';
-import type { SamlConfig } from '@node-saml/passport-saml';
 import appConfig from '../config/app';
 import Base from './base';
 import Identity from './identity.ee';
 import SamlAuthProvidersRoleMapping from './saml-auth-providers-role-mapping.ee';
 
 class SamlAuthProvider extends Base {
-  id!: string;
-  name: string;
-  certificate: string;
-  signatureAlgorithm: SamlConfig['signatureAlgorithm'];
-  issuer: string;
-  entryPoint: string;
-  firstnameAttributeName: string;
-  surnameAttributeName: string;
-  emailAttributeName: string;
-  roleAttributeName: string;
-  defaultRoleId: string;
-  active: boolean;
-  samlAuthProvidersRoleMappings?: SamlAuthProvidersRoleMapping[];
-
   static tableName = 'saml_auth_providers';
 
   static jsonSchema = {
@@ -83,7 +68,7 @@ class SamlAuthProvider extends Base {
     return new URL(`/login/saml/${this.issuer}`, appConfig.baseUrl).toString();
   }
 
-  get config(): SamlConfig {
+  get config() {
     const callbackUrl = new URL(
       `/login/saml/${this.issuer}/callback`,
       appConfig.baseUrl
diff --git a/packages/backend/src/models/saml-auth-providers-role-mapping.ee.ts b/packages/backend/src/models/saml-auth-providers-role-mapping.ee.js
similarity index 90%
rename from packages/backend/src/models/saml-auth-providers-role-mapping.ee.ts
rename to packages/backend/src/models/saml-auth-providers-role-mapping.ee.js
index 188d0797..a7179d1d 100644
--- a/packages/backend/src/models/saml-auth-providers-role-mapping.ee.ts
+++ b/packages/backend/src/models/saml-auth-providers-role-mapping.ee.js
@@ -2,11 +2,6 @@ import Base from './base';
 import SamlAuthProvider from './saml-auth-provider.ee';
 
 class SamlAuthProvidersRoleMapping extends Base {
-  id!: string;
-  samlAuthProviderId: string;
-  roleId: string;
-  remoteRoleName: string;
-
   static tableName = 'saml_auth_providers_role_mappings';
 
   static jsonSchema = {
diff --git a/packages/backend/src/models/step.ts b/packages/backend/src/models/step.js
similarity index 85%
rename from packages/backend/src/models/step.ts
rename to packages/backend/src/models/step.js
index f23faec9..7b1a0b84 100644
--- a/packages/backend/src/models/step.ts
+++ b/packages/backend/src/models/step.js
@@ -1,7 +1,5 @@
 import { URL } from 'node:url';
-import { QueryContext, ModelOptions } from 'objection';
 import get from 'lodash.get';
-import type { IJSONObject, IStep } from '@automatisch/types';
 import Base from './base';
 import App from './app';
 import Flow from './flow';
@@ -11,20 +9,6 @@ import Telemetry from '../helpers/telemetry';
 import appConfig from '../config/app';
 
 class Step extends Base {
-  id!: string;
-  flowId!: string;
-  key?: string;
-  appKey?: string;
-  type!: IStep['type'];
-  connectionId?: string;
-  status: 'incomplete' | 'completed';
-  position!: number;
-  parameters: IJSONObject;
-  connection?: Connection;
-  flow: Flow;
-  executionSteps: ExecutionStep[];
-  webhookPath?: string;
-
   static tableName = 'steps';
 
   static jsonSchema = {
@@ -100,18 +84,18 @@ class Step extends Base {
 
     if (!triggerCommand) return null;
 
-    const {
-      useSingletonWebhook,
-      singletonWebhookRefValueParameter,
-      type,
-    } = triggerCommand;
+    const { useSingletonWebhook, singletonWebhookRefValueParameter, type } =
+      triggerCommand;
 
     const isWebhook = type === 'webhook';
 
     if (!isWebhook) return null;
 
     if (singletonWebhookRefValueParameter) {
-      const parameterValue = get(this.parameters, singletonWebhookRefValueParameter);
+      const parameterValue = get(
+        this.parameters,
+        singletonWebhookRefValueParameter
+      );
       return `/webhooks/connections/${this.connectionId}/${parameterValue}`;
     }
 
@@ -131,21 +115,21 @@ class Step extends Base {
     return webhookUrl;
   }
 
-  async $afterInsert(queryContext: QueryContext) {
+  async $afterInsert(queryContext) {
     await super.$afterInsert(queryContext);
     Telemetry.stepCreated(this);
   }
 
-  async $afterUpdate(opt: ModelOptions, queryContext: QueryContext) {
+  async $afterUpdate(opt, queryContext) {
     await super.$afterUpdate(opt, queryContext);
     Telemetry.stepUpdated(this);
   }
 
-  get isTrigger(): boolean {
+  get isTrigger() {
     return this.type === 'trigger';
   }
 
-  get isAction(): boolean {
+  get isAction() {
     return this.type === 'action';
   }
 
diff --git a/packages/backend/src/models/subscription.ee.ts b/packages/backend/src/models/subscription.ee.js
similarity index 84%
rename from packages/backend/src/models/subscription.ee.ts
rename to packages/backend/src/models/subscription.ee.js
index 028dc332..c186a65d 100644
--- a/packages/backend/src/models/subscription.ee.ts
+++ b/packages/backend/src/models/subscription.ee.js
@@ -5,20 +5,6 @@ import { DateTime } from 'luxon';
 import { getPlanById } from '../helpers/billing/plans.ee';
 
 class Subscription extends Base {
-  id!: string;
-  userId!: string;
-  paddleSubscriptionId!: string;
-  paddlePlanId!: string;
-  updateUrl!: string;
-  cancelUrl!: string;
-  status!: string;
-  nextBillAmount!: string;
-  nextBillDate!: string;
-  lastBillDate?: string;
-  cancellationEffectiveDate?: string;
-  usageData?: UsageData[];
-  currentUsageData?: UsageData;
-
   static tableName = 'subscriptions';
 
   static jsonSchema = {
@@ -87,7 +73,7 @@ class Subscription extends Base {
     return (
       this.status === 'deleted' &&
       Number(this.cancellationEffectiveDate) >
-      DateTime.now().startOf('day').toMillis()
+        DateTime.now().startOf('day').toMillis()
     );
   }
 
diff --git a/packages/backend/src/models/usage-data.ee.ts b/packages/backend/src/models/usage-data.ee.js
similarity index 88%
rename from packages/backend/src/models/usage-data.ee.ts
rename to packages/backend/src/models/usage-data.ee.js
index ab1c8be2..8582ed27 100644
--- a/packages/backend/src/models/usage-data.ee.ts
+++ b/packages/backend/src/models/usage-data.ee.js
@@ -4,14 +4,6 @@ import User from './user';
 import Subscription from './subscription.ee';
 
 class UsageData extends Base {
-  id!: string;
-  userId!: string;
-  subscriptionId?: string;
-  consumedTaskCount!: number;
-  nextResetAt!: string;
-  subscription?: Subscription;
-  user?: User;
-
   static tableName = 'usage_data';
 
   static jsonSchema = {
diff --git a/packages/backend/src/models/user.ts b/packages/backend/src/models/user.js
similarity index 84%
rename from packages/backend/src/models/user.ts
rename to packages/backend/src/models/user.js
index 6aaba259..cb9c0cac 100644
--- a/packages/backend/src/models/user.ts
+++ b/packages/backend/src/models/user.js
@@ -1,7 +1,6 @@
 import bcrypt from 'bcrypt';
 import { DateTime } from 'luxon';
 import crypto from 'node:crypto';
-import { ModelOptions, QueryContext } from 'objection';
 
 import appConfig from '../config/app';
 import { hasValidLicense } from '../helpers/license.ee';
@@ -12,33 +11,12 @@ import Execution from './execution';
 import Flow from './flow';
 import Identity from './identity.ee';
 import Permission from './permission';
-import ExtendedQueryBuilder from './query-builder';
 import Role from './role';
 import Step from './step';
 import Subscription from './subscription.ee';
 import UsageData from './usage-data.ee';
 
 class User extends Base {
-  id!: string;
-  fullName!: string;
-  email!: string;
-  roleId: string;
-  password!: string;
-  resetPasswordToken: string;
-  resetPasswordTokenSentAt: string;
-  trialExpiryDate: string;
-  connections?: Connection[];
-  flows?: Flow[];
-  steps?: Step[];
-  executions?: Execution[];
-  usageData?: UsageData[];
-  currentUsageData?: UsageData;
-  subscriptions?: Subscription[];
-  currentSubscription?: Subscription;
-  role: Role;
-  permissions: Permission[];
-  identities: Identity[];
-
   static tableName = 'users';
 
   static jsonSchema = {
@@ -116,7 +94,7 @@ class User extends Base {
         from: 'usage_data.user_id',
         to: 'users.id',
       },
-      filter(builder: ExtendedQueryBuilder<UsageData>) {
+      filter(builder) {
         builder.orderBy('created_at', 'desc').limit(1).first();
       },
     },
@@ -135,7 +113,7 @@ class User extends Base {
         from: 'subscriptions.user_id',
         to: 'users.id',
       },
-      filter(builder: ExtendedQueryBuilder<Subscription>) {
+      filter(builder) {
         builder.orderBy('created_at', 'desc').limit(1).first();
       },
     },
@@ -165,7 +143,7 @@ class User extends Base {
     },
   });
 
-  login(password: string) {
+  login(password) {
     return bcrypt.compare(password, this.password);
   }
 
@@ -176,7 +154,7 @@ class User extends Base {
     await this.$query().patch({ resetPasswordToken, resetPasswordTokenSentAt });
   }
 
-  async resetPassword(password: string) {
+  async resetPassword(password) {
     return await this.$query().patch({
       resetPasswordToken: null,
       resetPasswordTokenSentAt: null,
@@ -235,9 +213,7 @@ class User extends Base {
       return false;
     }
 
-    const expiryDate = DateTime.fromJSDate(
-      this.trialExpiryDate as unknown as Date
-    );
+    const expiryDate = DateTime.fromJSDate(this.trialExpiryDate);
     const now = DateTime.now();
 
     return now < expiryDate;
@@ -261,7 +237,7 @@ class User extends Base {
     return currentUsageData.consumedTaskCount < plan.quota;
   }
 
-  async $beforeInsert(queryContext: QueryContext) {
+  async $beforeInsert(queryContext) {
     await super.$beforeInsert(queryContext);
 
     this.email = this.email.toLowerCase();
@@ -272,7 +248,7 @@ class User extends Base {
     }
   }
 
-  async $beforeUpdate(opt: ModelOptions, queryContext: QueryContext) {
+  async $beforeUpdate(opt, queryContext) {
     await super.$beforeUpdate(opt, queryContext);
 
     if (this.email) {
@@ -282,7 +258,7 @@ class User extends Base {
     await this.generateHash();
   }
 
-  async $afterInsert(queryContext: QueryContext) {
+  async $afterInsert(queryContext) {
     await super.$afterInsert(queryContext);
 
     if (appConfig.isCloud) {
@@ -294,7 +270,7 @@ class User extends Base {
     }
   }
 
-  async $afterFind(): Promise<any> {
+  async $afterFind() {
     if (await hasValidLicense()) return this;
 
     if (Array.isArray(this.permissions)) {
@@ -313,26 +289,26 @@ class User extends Base {
     return this;
   }
 
-  get ability(): ReturnType<typeof userAbility> {
+  get ability() {
     return userAbility(this);
   }
 
-  can(action: string, subject: string) {
+  can(action, subject) {
     const can = this.ability.can(action, subject);
 
     if (!can) throw new Error('Not authorized!');
 
     const relevantRule = this.ability.relevantRuleFor(action, subject);
 
-    const conditions = (relevantRule?.conditions as string[]) || [];
-    const conditionMap: Record<string, true> = Object.fromEntries(
+    const conditions = relevantRule?.conditions || [];
+    const conditionMap = Object.fromEntries(
       conditions.map((condition) => [condition, true])
     );
 
     return conditionMap;
   }
 
-  cannot(action: string, subject: string) {
+  cannot(action, subject) {
     const cannot = this.ability.cannot(action, subject);
 
     if (cannot) throw new Error('Not authorized!');