fix: Backend eslint warnings

packages/backend/src/apps/postgresql/authentication.ts

@@ -1,9 +1,4 @@
-import type {
-  IAuthentication,
-  IApp,
-  IField,
-  IJSONObject,
-} from '@automatisch/types';
+import type { IAuthentication, IApp, IJSONObject } from '@automatisch/types';
 import { Client } from 'pg';
 
 export default class Authentication implements IAuthentication {

packages/backend/src/apps/postgresql/index.ts

@@ -1,9 +1,15 @@
 import Authentication from './authentication';
+import {
+  IService,
+  IAuthentication,
+  IApp,
+  IJSONObject,
+} from '@automatisch/types';
 
-export default class PostgreSQL {
-  authenticationClient: any;
+export default class PostgreSQL implements IService {
+  authenticationClient: IAuthentication;
 
-  constructor(appData: any, connectionData: any) {
+  constructor(appData: IApp, connectionData: IJSONObject) {
     this.authenticationClient = new Authentication(appData, connectionData);
   }
 }