diff --git a/api/src/entities/Budget.ts b/api/src/entities/Budget.ts
index c02da4c..bdc423d 100644
--- a/api/src/entities/Budget.ts
+++ b/api/src/entities/Budget.ts
@@ -1,4 +1,5 @@
 import { Column, CreateDateColumn, Entity, ManyToOne, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
+import type { Relation } from 'typeorm';
 import { Category } from './Category.js';
 import { User } from './User.js';
 import { decimalTransformer } from '../utils/decimal.js';
@@ -30,8 +31,8 @@ export class Budget {
   updatedAt!: Date;
 
   @ManyToOne(() => User, { onDelete: 'CASCADE' })
-  user!: User;
+  user!: Relation<User>;
 
   @ManyToOne(() => Category, { eager: true, nullable: true, onDelete: 'SET NULL' })
-  category!: Category | null;
+  category!: Relation<Category> | null;
 }
diff --git a/api/src/entities/Category.ts b/api/src/entities/Category.ts
index 52d3834..affb05c 100644
--- a/api/src/entities/Category.ts
+++ b/api/src/entities/Category.ts
@@ -1,4 +1,5 @@
 import { Column, CreateDateColumn, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn } from 'typeorm';
+import type { Relation } from 'typeorm';
 import { Expense } from './Expense.js';
 import { User } from './User.js';
 
@@ -20,8 +21,8 @@ export class Category {
   createdAt!: Date;
 
   @ManyToOne(() => User, (user) => user.categories, { nullable: true, onDelete: 'CASCADE' })
-  user!: User | null;
+  user!: Relation<User> | null;
 
   @OneToMany(() => Expense, (expense) => expense.category)
-  expenses!: Expense[];
+  expenses!: Relation<Expense[]>;
 }
diff --git a/api/src/entities/Expense.ts b/api/src/entities/Expense.ts
index 99eb85a..d1af108 100644
--- a/api/src/entities/Expense.ts
+++ b/api/src/entities/Expense.ts
@@ -1,4 +1,5 @@
 import { Column, CreateDateColumn, Entity, ManyToOne, OneToMany, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
+import type { Relation } from 'typeorm';
 import { Category } from './Category.js';
 import { Proof } from './Proof.js';
 import { User } from './User.js';
@@ -61,11 +62,11 @@ export class Expense {
   updatedAt!: Date;
 
   @ManyToOne(() => User, (user) => user.expenses, { onDelete: 'CASCADE' })
-  user!: User;
+  user!: Relation<User>;
 
   @ManyToOne(() => Category, (category) => category.expenses, { eager: true, onDelete: 'RESTRICT' })
-  category!: Category;
+  category!: Relation<Category>;
 
   @OneToMany(() => Proof, (proof) => proof.expense, { eager: true, cascade: true })
-  proofs!: Proof[];
+  proofs!: Relation<Proof[]>;
 }
diff --git a/api/src/entities/Merchant.ts b/api/src/entities/Merchant.ts
index 472cc35..47963f3 100644
--- a/api/src/entities/Merchant.ts
+++ b/api/src/entities/Merchant.ts
@@ -1,4 +1,5 @@
 import { Column, CreateDateColumn, Entity, ManyToOne, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
+import type { Relation } from 'typeorm';
 import { User } from './User.js';
 
 @Entity('merchants')
@@ -25,5 +26,5 @@ export class Merchant {
   updatedAt!: Date;
 
   @ManyToOne(() => User, { onDelete: 'CASCADE' })
-  user!: User;
+  user!: Relation<User>;
 }
diff --git a/api/src/entities/Proof.ts b/api/src/entities/Proof.ts
index 1d9b3de..daa8366 100644
--- a/api/src/entities/Proof.ts
+++ b/api/src/entities/Proof.ts
@@ -1,4 +1,5 @@
 import { Column, CreateDateColumn, Entity, ManyToOne, PrimaryGeneratedColumn } from 'typeorm';
+import type { Relation } from 'typeorm';
 import { Expense } from './Expense.js';
 
 export type ProofType = 'RECEIPT' | 'INVOICE' | 'NOTE' | 'BANK_STATEMENT' | 'OTHER';
@@ -33,5 +34,5 @@ export class Proof {
   createdAt!: Date;
 
   @ManyToOne(() => Expense, (expense) => expense.proofs, { onDelete: 'CASCADE' })
-  expense!: Expense;
+  expense!: Relation<Expense>;
 }
diff --git a/api/src/entities/RecurringExpense.ts b/api/src/entities/RecurringExpense.ts
index 92c6032..e5e5567 100644
--- a/api/src/entities/RecurringExpense.ts
+++ b/api/src/entities/RecurringExpense.ts
@@ -1,4 +1,5 @@
 import { Column, CreateDateColumn, Entity, ManyToOne, PrimaryGeneratedColumn, UpdateDateColumn } from 'typeorm';
+import type { Relation } from 'typeorm';
 import { Category } from './Category.js';
 import { User } from './User.js';
 import { decimalTransformer } from '../utils/decimal.js';
@@ -71,8 +72,8 @@ export class RecurringExpense {
   updatedAt!: Date;
 
   @ManyToOne(() => User, { onDelete: 'CASCADE' })
-  user!: User;
+  user!: Relation<User>;
 
   @ManyToOne(() => Category, { eager: true, onDelete: 'RESTRICT' })
-  category!: Category;
+  category!: Relation<Category>;
 }
diff --git a/api/src/entities/User.ts b/api/src/entities/User.ts
index 0ab4d95..ff1ffba 100644
--- a/api/src/entities/User.ts
+++ b/api/src/entities/User.ts
@@ -1,4 +1,5 @@
 import { Column, CreateDateColumn, Entity, OneToMany, PrimaryGeneratedColumn } from 'typeorm';
+import type { Relation } from 'typeorm';
 import { Category } from './Category.js';
 import { Expense } from './Expense.js';
 
@@ -50,8 +51,8 @@ export class User {
   createdAt!: Date;
 
   @OneToMany(() => Category, (category) => category.user)
-  categories!: Category[];
+  categories!: Relation<Category[]>;
 
   @OneToMany(() => Expense, (expense) => expense.user)
-  expenses!: Expense[];
+  expenses!: Relation<Expense[]>;
 }