diff --git a/matemat/db/primitives/Product.py b/matemat/db/primitives/Product.py
index c543630..ed196d4 100644
--- a/matemat/db/primitives/Product.py
+++ b/matemat/db/primitives/Product.py
@@ -17,3 +17,15 @@ class Product:
         self.price_member: int = price_member
         self.price_non_member: int = price_non_member
         self.stock: int = stock
+
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, Product):
+            return False
+        return self.id == other.id and \
+            self.name == other.name and \
+            self.price_member == other.price_member and \
+            self.price_non_member == other.price_non_member and \
+            self.stock == other.stock
+
+    def __hash__(self) -> int:
+        return hash((self.id, self.name, self.price_member, self.price_non_member, self.stock))
diff --git a/matemat/db/primitives/Receipt.py b/matemat/db/primitives/Receipt.py
index 29f5d4b..f11320a 100644
--- a/matemat/db/primitives/Receipt.py
+++ b/matemat/db/primitives/Receipt.py
@@ -28,3 +28,15 @@ class Receipt:
         self.user: User = user
         self.from_date: datetime = from_date
         self.to_date: datetime = to_date
+
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, Receipt):
+            return False
+        return self.id == other.id and \
+            self.transactions == other.transactions and \
+            self.user == other.user and \
+            self.from_date == other.from_date and \
+            self.to_date == other.to_date
+
+    def __hash__(self) -> int:
+        return hash((self.id, self.transactions, self.user, self.from_date, self.to_date))
diff --git a/matemat/db/primitives/Transaction.py b/matemat/db/primitives/Transaction.py
index c2777ea..061f65f 100644
--- a/matemat/db/primitives/Transaction.py
+++ b/matemat/db/primitives/Transaction.py
@@ -45,6 +45,18 @@ class Transaction:
     def receipt_message(self) -> Optional[str]:
         return None
 
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, Transaction):
+            return False
+        return self.id == other.id and \
+            self.user == other.user and \
+            self.value == other.value and \
+            self.old_balance == other.old_balance and \
+            self.date == other.date
+
+    def __hash__(self) -> int:
+        return hash((self.id, self.user, self.value, self.old_balance, self.date))
+
 
 class Consumption(Transaction):
     """
@@ -66,6 +78,15 @@ class Consumption(Transaction):
     def receipt_description(self) -> str:
         return self.product
 
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, Consumption):
+            return False
+        return super().__eq__(other) and \
+            self.product == other.product
+
+    def __hash__(self) -> int:
+        return hash((super().__hash__(), self.product))
+
 
 class Deposit(Transaction):
     """
@@ -85,6 +106,14 @@ class Deposit(Transaction):
     def receipt_description(self) -> str:
         return 'Deposit'
 
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, Deposit):
+            return False
+        return super().__eq__(other)
+
+    def __hash__(self) -> int:
+        return super().__hash__()
+
 
 class Modification(Transaction):
     """
@@ -122,3 +151,13 @@ class Modification(Transaction):
             return None
         else:
             return f'Reason: «{self.reason}»'
+
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, Modification):
+            return False
+        return super().__eq__(other) and \
+            self.agent == other.agent and \
+            self.reason == other.reason
+
+    def __hash__(self) -> int:
+        return hash((super().__hash__(), self.agent, self.reason))
diff --git a/matemat/db/primitives/User.py b/matemat/db/primitives/User.py
index 01f8032..ce203d7 100644
--- a/matemat/db/primitives/User.py
+++ b/matemat/db/primitives/User.py
@@ -34,3 +34,17 @@ class User:
         self.is_admin: bool = is_admin
         self.is_member: bool = is_member
         self.receipt_pref: ReceiptPreference = receipt_pref
+
+    def __eq__(self, other) -> bool:
+        if not isinstance(other, User):
+            return False
+        return self.id == other.id and \
+            self.name == other.name and \
+            self.balance == other.balance and \
+            self.email == other.email and \
+            self.is_admin == other.is_admin and \
+            self.is_member == other.is_member and \
+            self.receipt_pref == other.receipt_pref
+
+    def __hash__(self) -> int:
+        return hash((self.id, self.name, self.balance, self.email, self.is_admin, self.is_member, self.receipt_pref))