diff --git a/src/server/api/account/create.post.ts b/src/server/api/account/create.post.ts
index 4d58e470..b5194459 100644
--- a/src/server/api/account/create.post.ts
+++ b/src/server/api/account/create.post.ts
@@ -3,6 +3,6 @@ export default defineEventHandler(async (event) => {
     event,
     validateZod(passwordType)
   );
-  await Database.createUser(username, password);
+  await Database.user.create(username, password);
   return { success: true };
 });
diff --git a/src/server/api/account/setup.post.ts b/src/server/api/account/setup.post.ts
index ca89a753..123308af 100644
--- a/src/server/api/account/setup.post.ts
+++ b/src/server/api/account/setup.post.ts
@@ -3,13 +3,13 @@ export default defineEventHandler(async (event) => {
     event,
     validateZod(passwordType)
   );
-  const users = await Database.getUsers();
+  const users = await Database.user.findAll();
   if (users.length !== 0) {
     throw createError({
       statusCode: 400,
       statusMessage: 'Invalid state',
     });
   }
-  await Database.createUser(username, password);
+  await Database.user.create(username, password);
   return { success: true };
 });
diff --git a/src/server/api/cnf/[oneTimeLink].ts b/src/server/api/cnf/[oneTimeLink].ts
index ffb0eb8b..64d39c32 100644
--- a/src/server/api/cnf/[oneTimeLink].ts
+++ b/src/server/api/cnf/[oneTimeLink].ts
@@ -1,5 +1,5 @@
 export default defineEventHandler(async (event) => {
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
   if (!system.oneTimeLinks.enabled) {
     throw createError({
       statusCode: 404,
diff --git a/src/server/api/features.get.ts b/src/server/api/features.get.ts
index c2868ede..0016e2bf 100644
--- a/src/server/api/features.get.ts
+++ b/src/server/api/features.get.ts
@@ -1,5 +1,5 @@
 export default defineEventHandler(async () => {
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
   return {
     trafficStats: system.trafficStats,
     sortClients: system.sortClients,
diff --git a/src/server/api/lang.get.ts b/src/server/api/lang.get.ts
index 2c31214b..d16ac483 100644
--- a/src/server/api/lang.get.ts
+++ b/src/server/api/lang.get.ts
@@ -1,5 +1,5 @@
 export default defineEventHandler(async (event) => {
   setHeader(event, 'Content-Type', 'application/json');
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
   return system.lang;
 });
diff --git a/src/server/api/session.post.ts b/src/server/api/session.post.ts
index 71e47b7a..ea9e1a36 100644
--- a/src/server/api/session.post.ts
+++ b/src/server/api/session.post.ts
@@ -6,7 +6,7 @@ export default defineEventHandler(async (event) => {
     validateZod(credentialsType)
   );
 
-  const users = await Database.getUsers();
+  const users = await Database.user.findAll();
   const user = users.find((user) => user.username == username);
   if (!user)
     throw createError({
@@ -23,7 +23,7 @@ export default defineEventHandler(async (event) => {
     });
   }
 
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
 
   const conf: SessionConfig = system.sessionConfig;
 
diff --git a/src/server/api/wireguard/client/[clientId]/generateOneTimeLink.post.ts b/src/server/api/wireguard/client/[clientId]/generateOneTimeLink.post.ts
index b55f8be1..221874e4 100644
--- a/src/server/api/wireguard/client/[clientId]/generateOneTimeLink.post.ts
+++ b/src/server/api/wireguard/client/[clientId]/generateOneTimeLink.post.ts
@@ -1,5 +1,5 @@
 export default defineEventHandler(async (event) => {
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
   if (!system.oneTimeLinks.enabled) {
     throw createError({
       status: 404,
diff --git a/src/server/middleware/session.ts b/src/server/middleware/session.ts
index e60b1187..1df2a796 100644
--- a/src/server/middleware/session.ts
+++ b/src/server/middleware/session.ts
@@ -10,7 +10,7 @@ export default defineEventHandler(async (event) => {
   ) {
     return;
   }
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
   if (!system)
     throw createError({
       statusCode: 500,
@@ -24,7 +24,7 @@ export default defineEventHandler(async (event) => {
 
   const authorization = getHeader(event, 'Authorization');
   if (url.pathname.startsWith('/api/') && authorization) {
-    const users = await Database.getUsers();
+    const users = await Database.user.findAll();
     const user = users.find((user) => user.id == session.data.userId);
     if (!user)
       throw createError({
diff --git a/src/server/middleware/setup.ts b/src/server/middleware/setup.ts
index a4fce170..6c28988d 100644
--- a/src/server/middleware/setup.ts
+++ b/src/server/middleware/setup.ts
@@ -10,7 +10,7 @@ export default defineEventHandler(async (event) => {
     return;
   }
 
-  const users = await Database.getUsers();
+  const users = await Database.user.findAll();
   if (users.length === 0) {
     if (url.pathname.startsWith('/api/')) {
       throw createError({
diff --git a/src/server/utils/WireGuard.ts b/src/server/utils/WireGuard.ts
index ce339fa9..b10cccd5 100644
--- a/src/server/utils/WireGuard.ts
+++ b/src/server/utils/WireGuard.ts
@@ -16,8 +16,8 @@ class WireGuard {
   }
 
   async #saveWireguardConfig() {
-    const system = await Database.getSystem();
-    const clients = await Database.getClients();
+    const system = await Database.system.get();
+    const clients = await Database.client.findAll();
     const result = [];
     result.push(wg.generateServerInterface(system));
 
@@ -42,7 +42,7 @@ class WireGuard {
   }
 
   async getClients() {
-    const dbClients = await Database.getClients();
+    const dbClients = await Database.client.findAll();
     const clients = Object.entries(dbClients).map(([clientId, client]) => ({
       id: clientId,
       name: client.name,
@@ -91,7 +91,7 @@ class WireGuard {
   }
 
   async getClient({ clientId }: { clientId: string }) {
-    const client = await Database.getClient(clientId);
+    const client = await Database.client.findById(clientId);
     if (!client) {
       throw createError({
         statusCode: 404,
@@ -103,7 +103,7 @@ class WireGuard {
   }
 
   async getClientConfiguration({ clientId }: { clientId: string }) {
-    const system = await Database.getSystem();
+    const system = await Database.system.get();
     const client = await this.getClient({ clientId });
 
     return wg.generateClientConfig(system, client);
@@ -124,8 +124,8 @@ class WireGuard {
     name: string;
     expireDate: string | null;
   }) {
-    const system = await Database.getSystem();
-    const clients = await Database.getClients();
+    const system = await Database.system.get();
+    const clients = await Database.client.findAll();
 
     const privateKey = await wg.generatePrivateKey();
     const publicKey = await wg.getPublicKey(privateKey);
@@ -162,7 +162,7 @@ class WireGuard {
       client.expiresAt = date.toISOString();
     }
 
-    await Database.createClient(client);
+    await Database.client.create(client);
 
     await this.saveConfig();
 
@@ -170,12 +170,12 @@ class WireGuard {
   }
 
   async deleteClient({ clientId }: { clientId: string }) {
-    await Database.deleteClient(clientId);
+    await Database.client.delete(clientId);
     await this.saveConfig();
   }
 
   async enableClient({ clientId }: { clientId: string }) {
-    await Database.toggleClient(clientId, true);
+    await Database.client.toggle(clientId, true);
 
     await this.saveConfig();
   }
@@ -184,7 +184,7 @@ class WireGuard {
     const key = `${clientId}-${Math.floor(Math.random() * 1000)}`;
     const oneTimeLink = Math.abs(CRC32.str(key)).toString(16);
     const expiresAt = new Date(Date.now() + 5 * 60 * 1000).toISOString();
-    await Database.createOneTimeLink(clientId, {
+    await Database.client.createOneTimeLink(clientId, {
       oneTimeLink,
       expiresAt,
     });
@@ -192,12 +192,12 @@ class WireGuard {
   }
 
   async eraseOneTimeLink({ clientId }: { clientId: string }) {
-    await Database.deleteOneTimeLink(clientId);
+    await Database.client.deleteOneTimeLink(clientId);
     await this.saveConfig();
   }
 
   async disableClient({ clientId }: { clientId: string }) {
-    await Database.toggleClient(clientId, false);
+    await Database.client.toggle(clientId, false);
 
     await this.saveConfig();
   }
@@ -209,7 +209,7 @@ class WireGuard {
     clientId: string;
     name: string;
   }) {
-    await Database.updateClientName(clientId, name);
+    await Database.client.updateName(clientId, name);
 
     await this.saveConfig();
   }
@@ -228,7 +228,7 @@ class WireGuard {
       });
     }
 
-    await Database.updateClientAddress4(clientId, address4);
+    await Database.client.updateAddress4(clientId, address4);
 
     await this.saveConfig();
   }
@@ -250,7 +250,7 @@ class WireGuard {
       updatedDate = date.toISOString();
     }
 
-    await Database.updateClientExpirationDate(clientId, updatedDate);
+    await Database.client.updateExpirationDate(clientId, updatedDate);
 
     await this.saveConfig();
   }
@@ -323,8 +323,8 @@ class WireGuard {
   }
 
   async cronJob() {
-    const clients = await Database.getClients();
-    const system = await Database.getSystem();
+    const clients = await Database.client.findAll();
+    const system = await Database.system.get();
     // Expires Feature
     if (system.clientExpiration.enabled) {
       for (const client of Object.values(clients)) {
@@ -334,7 +334,7 @@ class WireGuard {
           new Date() > new Date(client.expiresAt)
         ) {
           DEBUG(`Client ${client.id} expired.`);
-          await Database.toggleClient(client.id, false);
+          await Database.client.toggle(client.id, false);
         }
       }
     }
@@ -346,7 +346,7 @@ class WireGuard {
           new Date() > new Date(client.oneTimeLink.expiresAt)
         ) {
           DEBUG(`Client ${client.id} One Time Link expired.`);
-          await Database.deleteOneTimeLink(client.id);
+          await Database.client.deleteOneTimeLink(client.id);
         }
       }
     }
diff --git a/src/server/utils/config.ts b/src/server/utils/config.ts
index f927590a..2b904bbb 100644
--- a/src/server/utils/config.ts
+++ b/src/server/utils/config.ts
@@ -34,7 +34,7 @@ export async function migrateConfig(input: unknown) {
   if (!res.success) {
     throw new Error('Invalid Config');
   }
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
   const oldConfig = res.data;
   const oldCidr = parseCidr(oldConfig.server.address + '/24');
   const db = {
diff --git a/src/server/utils/session.ts b/src/server/utils/session.ts
index 0761cfed..e6f86bcc 100644
--- a/src/server/utils/session.ts
+++ b/src/server/utils/session.ts
@@ -5,7 +5,7 @@ export type WGSession = {
 };
 
 export async function useWGSession(event: H3Event) {
-  const system = await Database.getSystem();
+  const system = await Database.system.get();
   if (!system) throw new Error('Invalid');
   return useSession<Partial<WGSession>>(event, system.sessionConfig);
 }
diff --git a/src/services/database/lowdb.ts b/src/services/database/lowdb.ts
index 4ad3e736..992c533b 100644
--- a/src/services/database/lowdb.ts
+++ b/src/services/database/lowdb.ts
@@ -9,52 +9,26 @@ import {
 import { JSONFilePreset } from 'lowdb/node';
 
 import type { Low } from 'lowdb';
-import type { User } from './repositories/user';
+import { UserRepository, type User } from './repositories/user';
 import type { Database } from './repositories/database';
 import { migrationRunner } from './migrations';
-import type { Client, NewClient, OneTimeLink } from './repositories/client';
+import {
+  ClientRepository,
+  type Client,
+  type NewClient,
+  type OneTimeLink,
+} from './repositories/client';
+import { SystemRepository } from './repositories/system';
 
 const DEBUG = debug('LowDB');
 
-export default class LowDB extends DatabaseProvider {
-  #db!: Low<Database>;
-  #connected = false;
-
-  private async __init() {
-    const dbFilePath = '/etc/wireguard/db.json';
-    this.#db = await JSONFilePreset(dbFilePath, DEFAULT_DATABASE);
+export class LowDBSystem extends SystemRepository {
+  #db: Low<Database>;
+  constructor(db: Low<Database>) {
+    super();
+    this.#db = db;
   }
-
-  /**
-   * @throws
-   */
-  async connect() {
-    if (this.#connected) {
-      return;
-    }
-    try {
-      await this.__init();
-      DEBUG('Running Migrations');
-      await migrationRunner(this.#db);
-      DEBUG('Migrations ran successfully');
-    } catch (e) {
-      DEBUG(e);
-      throw new Error('Failed to initialize Database');
-    }
-    this.#connected = true;
-    DEBUG('Connected successfully');
-  }
-
-  get connected() {
-    return this.#connected;
-  }
-
-  async disconnect() {
-    this.#connected = false;
-    DEBUG('Disconnected successfully');
-  }
-
-  async getSystem() {
+  async get() {
     DEBUG('Get System');
     const system = this.#db.data.system;
     // system is only null if migration failed
@@ -63,18 +37,25 @@ export default class LowDB extends DatabaseProvider {
     }
     return system;
   }
+}
 
+export class LowDBUser extends UserRepository {
+  #db: Low<Database>;
+  constructor(db: Low<Database>) {
+    super();
+    this.#db = db;
+  }
   // TODO: return copy to avoid mutation (everywhere)
-  async getUsers() {
+  async findAll() {
     return this.#db.data.users;
   }
 
-  async getUser(id: string) {
+  async findById(id: string) {
     DEBUG('Get User');
     return this.#db.data.users.find((user) => user.id === id);
   }
 
-  async createUser(username: string, password: string) {
+  async create(username: string, password: string) {
     DEBUG('Create User');
 
     const isUserExist = this.#db.data.users.find(
@@ -106,9 +87,9 @@ export default class LowDB extends DatabaseProvider {
     await this.#db.update((data) => data.users.push(newUser));
   }
 
-  async updateUser(user: User) {
+  async update(user: User) {
     // TODO: avoid mutation, prefer .update, updatedAt
-    let oldUser = await this.getUser(user.id);
+    let oldUser = await this.findById(user.id);
     if (oldUser) {
       DEBUG('Update User');
       oldUser = user;
@@ -116,25 +97,32 @@ export default class LowDB extends DatabaseProvider {
     }
   }
 
-  async deleteUser(id: string) {
+  async delete(id: string) {
     DEBUG('Delete User');
     const idx = this.#db.data.users.findIndex((user) => user.id === id);
     if (idx !== -1) {
       await this.#db.update((data) => data.users.splice(idx, 1));
     }
   }
+}
 
-  async getClients() {
+export class LowDBClient extends ClientRepository {
+  #db: Low<Database>;
+  constructor(db: Low<Database>) {
+    super();
+    this.#db = db;
+  }
+  async findAll() {
     DEBUG('GET Clients');
     return this.#db.data.clients;
   }
 
-  async getClient(id: string) {
+  async findById(id: string) {
     DEBUG('Get Client');
     return this.#db.data.clients[id];
   }
 
-  async createClient(client: NewClient) {
+  async create(client: NewClient) {
     DEBUG('Create Client');
     const now = new Date().toISOString();
     const newClient: Client = { ...client, createdAt: now, updatedAt: now };
@@ -143,7 +131,7 @@ export default class LowDB extends DatabaseProvider {
     });
   }
 
-  async deleteClient(id: string) {
+  async delete(id: string) {
     DEBUG('Delete Client');
     await this.#db.update((data) => {
       // TODO: find something better than delete
@@ -152,7 +140,7 @@ export default class LowDB extends DatabaseProvider {
     });
   }
 
-  async toggleClient(id: string, enable: boolean) {
+  async toggle(id: string, enable: boolean) {
     DEBUG('Toggle Client');
     await this.#db.update((data) => {
       if (data.clients[id]) {
@@ -161,7 +149,7 @@ export default class LowDB extends DatabaseProvider {
     });
   }
 
-  async updateClientName(id: string, name: string) {
+  async updateName(id: string, name: string) {
     DEBUG('Update Client Name');
     await this.#db.update((data) => {
       if (data.clients[id]) {
@@ -170,7 +158,7 @@ export default class LowDB extends DatabaseProvider {
     });
   }
 
-  async updateClientAddress4(id: string, address4: string) {
+  async updateAddress4(id: string, address4: string) {
     DEBUG('Update Client Address4');
     await this.#db.update((data) => {
       if (data.clients[id]) {
@@ -179,7 +167,7 @@ export default class LowDB extends DatabaseProvider {
     });
   }
 
-  async updateClientExpirationDate(id: string, expirationDate: string | null) {
+  async updateExpirationDate(id: string, expirationDate: string | null) {
     DEBUG('Update Client Expiration Date');
     await this.#db.update((data) => {
       if (data.clients[id]) {
@@ -211,3 +199,49 @@ export default class LowDB extends DatabaseProvider {
     });
   }
 }
+
+export default class LowDB extends DatabaseProvider {
+  #db!: Low<Database>;
+  #connected = false;
+
+  system!: LowDBSystem;
+  user!: LowDBUser;
+  client!: LowDBClient;
+
+  /**
+   * @throws
+   */
+  async connect() {
+    if (this.#connected) {
+      return;
+    }
+    try {
+      DEBUG('Connecting');
+      this.#db = await JSONFilePreset(
+        '/etc/wireguard/db.json',
+        DEFAULT_DATABASE
+      );
+
+      DEBUG('Running Migrations');
+      await migrationRunner(this.#db);
+      DEBUG('Migrations ran successfully');
+    } catch (e) {
+      DEBUG(e);
+      throw new Error('Failed to initialize Database');
+    }
+    this.system = new LowDBSystem(this.#db);
+    this.user = new LowDBUser(this.#db);
+    this.client = new LowDBClient(this.#db);
+    this.#connected = true;
+    DEBUG('Connected successfully');
+  }
+
+  get connected() {
+    return this.#connected;
+  }
+
+  async disconnect() {
+    this.#connected = false;
+    DEBUG('Disconnected successfully');
+  }
+}
diff --git a/src/services/database/migrations/1.ts b/src/services/database/migrations/1.ts
index cf930703..39a9c6c2 100644
--- a/src/services/database/migrations/1.ts
+++ b/src/services/database/migrations/1.ts
@@ -72,31 +72,29 @@ export async function run1(db: Low<Database>) {
   };
 
   // TODO: properly check if ipv6 support
-  database.system.iptables.PostUp = `
-iptables -t nat -A POSTROUTING -s ${database.system.userConfig.address4Range} -o ${database.system.wgDevice} -j MASQUERADE;
+  database.system.iptables.PostUp =
+    `iptables -t nat -A POSTROUTING -s ${database.system.userConfig.address4Range} -o ${database.system.wgDevice} -j MASQUERADE;
 iptables -A INPUT -p udp -m udp --dport ${database.system.wgPort} -j ACCEPT;
 iptables -A FORWARD -i wg0 -j ACCEPT;
 iptables -A FORWARD -o wg0 -j ACCEPT;
 ip6tables -t nat -A POSTROUTING -s ${database.system.userConfig.address6Range} -o ${database.system.wgDevice} -j MASQUERADE;
 ip6tables -A INPUT -p udp -m udp --dport ${database.system.wgPort} -j ACCEPT;
 ip6tables -A FORWARD -i wg0 -j ACCEPT;
-ip6tables -A FORWARD -o wg0 -j ACCEPT;
-`
-    .split('\n')
-    .join(' ');
+ip6tables -A FORWARD -o wg0 -j ACCEPT;`
+      .split('\n')
+      .join(' ');
 
-  database.system.iptables.PostDown = `
-iptables -t nat -D POSTROUTING -s ${database.system.userConfig.address4Range} -o ${database.system.wgDevice} -j MASQUERADE;
+  database.system.iptables.PostDown =
+    `iptables -t nat -D POSTROUTING -s ${database.system.userConfig.address4Range} -o ${database.system.wgDevice} -j MASQUERADE;
 iptables -D INPUT -p udp -m udp --dport ${database.system.wgPort} -j ACCEPT;
 iptables -D FORWARD -i wg0 -j ACCEPT;
 iptables -D FORWARD -o wg0 -j ACCEPT;
 ip6tables -t nat -D POSTROUTING -s ${database.system.userConfig.address6Range} -o ${database.system.wgDevice} -j MASQUERADE;
 ip6tables -D INPUT -p udp -m udp --dport ${database.system.wgPort} -j ACCEPT;
 ip6tables -D FORWARD -i wg0 -j ACCEPT;
-ip6tables -D FORWARD -o wg0 -j ACCEPT;
-`
-    .split('\n')
-    .join(' ');
+ip6tables -D FORWARD -o wg0 -j ACCEPT;`
+      .split('\n')
+      .join(' ');
 
   db.data = database;
   db.write();
diff --git a/src/services/database/repositories/client.ts b/src/services/database/repositories/client.ts
index 9b8573cf..a5d2cc85 100644
--- a/src/services/database/repositories/client.ts
+++ b/src/services/database/repositories/client.ts
@@ -31,18 +31,21 @@ export type NewClient = Omit<Client, 'createdAt' | 'updatedAt'>;
  * Interface for client-related database operations.
  * This interface provides methods for managing client data.
  */
-export interface ClientRepository {
-  getClients(): Promise<Record<string, Client>>;
-  getClient(id: string): Promise<Client | undefined>;
-  createClient(client: NewClient): Promise<void>;
-  deleteClient(id: string): Promise<void>;
-  toggleClient(id: string, enable: boolean): Promise<void>;
-  updateClientName(id: string, name: string): Promise<void>;
-  updateClientAddress4(id: string, address4: string): Promise<void>;
-  updateClientExpirationDate(
+export abstract class ClientRepository {
+  abstract findAll(): Promise<Record<string, Client>>;
+  abstract findById(id: string): Promise<Client | undefined>;
+  abstract create(client: NewClient): Promise<void>;
+  abstract delete(id: string): Promise<void>;
+  abstract toggle(id: string, enable: boolean): Promise<void>;
+  abstract updateName(id: string, name: string): Promise<void>;
+  abstract updateAddress4(id: string, address4: string): Promise<void>;
+  abstract updateExpirationDate(
     id: string,
     expirationDate: string | null
   ): Promise<void>;
-  deleteOneTimeLink(id: string): Promise<void>;
-  createOneTimeLink(id: string, oneTimeLink: OneTimeLink): Promise<void>;
+  abstract deleteOneTimeLink(id: string): Promise<void>;
+  abstract createOneTimeLink(
+    id: string,
+    oneTimeLink: OneTimeLink
+  ): Promise<void>;
 }
diff --git a/src/services/database/repositories/database.ts b/src/services/database/repositories/database.ts
index a834ba1e..4beaab90 100644
--- a/src/services/database/repositories/database.ts
+++ b/src/services/database/repositories/database.ts
@@ -1,9 +1,4 @@
-import type {
-  ClientRepository,
-  Client,
-  NewClient,
-  OneTimeLink,
-} from './client';
+import type { ClientRepository, Client } from './client';
 import type { System, SystemRepository } from './system';
 import type { User, UserRepository } from './user';
 
@@ -29,9 +24,7 @@ export const DEFAULT_DATABASE: Database = {
  * **Note :** Always throw `DatabaseError` to ensure proper API error handling.
  *
  */
-export abstract class DatabaseProvider
-  implements SystemRepository, UserRepository, ClientRepository
-{
+export abstract class DatabaseProvider {
   /**
    * Connects to the database.
    */
@@ -42,30 +35,9 @@ export abstract class DatabaseProvider
    */
   abstract disconnect(): Promise<void>;
 
-  abstract getSystem(): Promise<System>;
-
-  abstract getUsers(): Promise<User[]>;
-  abstract getUser(id: string): Promise<User | undefined>;
-  abstract createUser(username: string, password: string): Promise<void>;
-  abstract updateUser(user: User): Promise<void>;
-  abstract deleteUser(id: string): Promise<void>;
-
-  abstract getClients(): Promise<Record<string, Client>>;
-  abstract getClient(id: string): Promise<Client | undefined>;
-  abstract createClient(client: NewClient): Promise<void>;
-  abstract deleteClient(id: string): Promise<void>;
-  abstract toggleClient(id: string, enable: boolean): Promise<void>;
-  abstract updateClientName(id: string, name: string): Promise<void>;
-  abstract updateClientAddress4(id: string, address4: string): Promise<void>;
-  abstract updateClientExpirationDate(
-    id: string,
-    expirationDate: string | null
-  ): Promise<void>;
-  abstract deleteOneTimeLink(id: string): Promise<void>;
-  abstract createOneTimeLink(
-    id: string,
-    oneTimeLink: OneTimeLink
-  ): Promise<void>;
+  abstract system: SystemRepository;
+  abstract user: UserRepository;
+  abstract client: ClientRepository;
 }
 
 /**
diff --git a/src/services/database/repositories/system.ts b/src/services/database/repositories/system.ts
index 6fae9c8f..cf9c8aab 100644
--- a/src/services/database/repositories/system.ts
+++ b/src/services/database/repositories/system.ts
@@ -80,9 +80,9 @@ export type System = {
  * This interface provides methods for retrieving system configuration data
  * and specific system properties, such as the language setting, from the database.
  */
-export interface SystemRepository {
+export abstract class SystemRepository {
   /**
    * Retrieves the system configuration data from the database.
    */
-  getSystem(): Promise<System>;
+  abstract get(): Promise<System>;
 }
diff --git a/src/services/database/repositories/user.ts b/src/services/database/repositories/user.ts
index f7a04b79..c09285e0 100644
--- a/src/services/database/repositories/user.ts
+++ b/src/services/database/repositories/user.ts
@@ -28,26 +28,26 @@ export type User = {
  * Interface for user-related database operations.
  * This interface provides methods for managing user data.
  */
-export interface UserRepository {
+export abstract class UserRepository {
   /**
    * Retrieves all users from the database.
    */
-  getUsers(): Promise<User[]>;
+  abstract findAll(): Promise<User[]>;
 
   /**
    * Retrieves a user by their ID or User object from the database.
    */
-  getUser(id: string): Promise<User | undefined>;
+  abstract findById(id: string): Promise<User | undefined>;
 
-  createUser(username: string, password: string): Promise<void>;
+  abstract create(username: string, password: string): Promise<void>;
 
   /**
    * Updates a user in the database.
    */
-  updateUser(user: User): Promise<void>;
+  abstract update(user: User): Promise<void>;
 
   /**
    * Deletes a user from the database.
    */
-  deleteUser(id: string): Promise<void>;
+  abstract delete(id: string): Promise<void>;
 }