diff --git a/backend/app/models/chargepoint.py b/backend/app/models/chargepoint.py
index e24e180..c41d0d3 100644
--- a/backend/app/models/chargepoint.py
+++ b/backend/app/models/chargepoint.py
@@ -25,3 +25,4 @@ class ChargePoint(Base):
     connectors = relationship("Connector", cascade="delete, delete-orphan")
     transactions = relationship("Transaction", cascade="delete, delete-orphan")
     variables = relationship("ChargepointVariable", cascade="delete, delete-orphan")
+    firmware_updates = relationship("FirmwareUpdate", cascade="delete, delete-orphan")
diff --git a/backend/app/models/firmware_update.py b/backend/app/models/firmware_update.py
index 9e4fc4b..5d0d9f7 100644
--- a/backend/app/models/firmware_update.py
+++ b/backend/app/models/firmware_update.py
@@ -1,5 +1,6 @@
 import uuid
 from sqlalchemy import Column, DateTime, Enum, ForeignKey, Integer, String, Text, Uuid
+from sqlalchemy.orm import relationship
 
 from app.database import Base
 from app.schemas.firmware_update import FirmwareUpdateStatus
@@ -20,3 +21,4 @@ class FirmwareUpdate(Base):
     signature = Column(String, nullable=True)
 
     chargepoint_id = Column(Uuid, ForeignKey("chargepoints.id"), index=True)
+    chargepoint = relationship("ChargePoint", back_populates="firmware_updates")
diff --git a/backend/app/models/meter_value.py b/backend/app/models/meter_value.py
index e2528ed..5adf6a1 100644
--- a/backend/app/models/meter_value.py
+++ b/backend/app/models/meter_value.py
@@ -1,5 +1,6 @@
 import uuid
 from sqlalchemy import Uuid, Column, DateTime, Enum, Float, ForeignKey, String
+from sqlalchemy.orm import relationship
 
 from app.database import Base
 from app.schemas.meter_value import Measurand, PhaseType
@@ -14,4 +15,5 @@ class MeterValue(Base):
     unit = Column(String, nullable=True)
     value = Column(Float)
 
-    transaction_id = Column(String, ForeignKey("transactions.id"), index=True)
\ No newline at end of file
+    transaction_id = Column(String, ForeignKey("transactions.id"), index=True)
+    transaction = relationship("Transaction", back_populates="meter_values")
\ No newline at end of file
diff --git a/backend/app/models/session.py b/backend/app/models/session.py
index cd0c5ba..d9c0ce2 100644
--- a/backend/app/models/session.py
+++ b/backend/app/models/session.py
@@ -1,5 +1,6 @@
 import uuid
 from sqlalchemy import Column, DateTime, ForeignKey, String, Uuid
+from sqlalchemy.orm import relationship
 
 from app.database import Base
 
@@ -11,4 +12,5 @@ class Session(Base):
     refresh_token = Column(String, nullable=False, unique=True, index=True)
     last_used = Column(DateTime(timezone=True))
 
-    user_id = Column(Uuid, ForeignKey("users.id"), nullable=False, index=True)
\ No newline at end of file
+    user_id = Column(Uuid, ForeignKey("users.id"), nullable=False, index=True)
+    user = relationship("User", back_populates="sessions")
\ No newline at end of file
diff --git a/backend/app/models/transaction.py b/backend/app/models/transaction.py
index a918430..b4dcbce 100644
--- a/backend/app/models/transaction.py
+++ b/backend/app/models/transaction.py
@@ -1,4 +1,5 @@
 from sqlalchemy import String, Uuid, Column, DateTime, Enum, Numeric, ForeignKey
+from sqlalchemy.orm import relationship
 
 from app.schemas.transaction import TransactionEventTriggerReason, TransactionStatus
 from app.database import Base
@@ -16,4 +17,9 @@ class Transaction(Base):
     price = Column(Numeric(10,2))
 
     user_id = Column(Uuid, ForeignKey("users.id"), nullable=True, index=True)
+    user = relationship("User", back_populates="transactions")
+
     chargepoint_id = Column(Uuid, ForeignKey("chargepoints.id"), index=True)
+    chargepoint = relationship("ChargePoint", back_populates="transactions")
+
+    meter_values = relationship("MeterValue", cascade="delete, delete-orphan")
diff --git a/backend/app/models/user.py b/backend/app/models/user.py
index 75cf5da..bfdefb9 100644
--- a/backend/app/models/user.py
+++ b/backend/app/models/user.py
@@ -17,3 +17,4 @@ class User(Base):
     
     id_tokens = relationship("IdToken", back_populates="owner", cascade="delete, delete-orphan")
     transactions = relationship("Transaction", cascade="delete, delete-orphan")
+    sessions = relationship("Session", cascade="delete, delete-orphan")
diff --git a/backend/app/schemas/chargepoint.py b/backend/app/schemas/chargepoint.py
index 2493315..a7d4972 100644
--- a/backend/app/schemas/chargepoint.py
+++ b/backend/app/schemas/chargepoint.py
@@ -36,6 +36,15 @@ class ChargePoint(ChargePointBase):
         from_attributes = True
         json_encoders = {Decimal: decimal_encoder}
 
+class ChargePointThumb(BaseModel):
+    id: UUID
+    identity: str
+    price: Decimal
+
+    class Config:
+        from_attributes = True
+        json_encoders = {Decimal: decimal_encoder}
+
 class ChargePointPassword(BaseModel):
     password: str
     
diff --git a/backend/app/schemas/transaction.py b/backend/app/schemas/transaction.py
index 0188f91..7ad8b8d 100644
--- a/backend/app/schemas/transaction.py
+++ b/backend/app/schemas/transaction.py
@@ -1,10 +1,11 @@
+import enum
 from datetime import datetime
 from decimal import Decimal
-import enum
 from typing import Optional
-from uuid import UUID
 from pydantic import BaseModel
 
+from app.schemas.chargepoint import ChargePointThumb
+from app.schemas.user import UserThumb
 from app.util.encoders import decimal_encoder
 
 class TransactionStatus(enum.Enum):
@@ -47,8 +48,8 @@ class Transaction(BaseModel):
     meter_end: Optional[Decimal] = None
     end_reason: Optional[TransactionEventTriggerReason] = None
     price: Decimal
-    user_id: Optional[UUID] = None
-    chargepoint_id: UUID
+    user: UserThumb
+    chargepoint: ChargePointThumb
 
     class Config:
         from_attributes = True
diff --git a/backend/app/schemas/user.py b/backend/app/schemas/user.py
index 8737aa4..c113e88 100644
--- a/backend/app/schemas/user.py
+++ b/backend/app/schemas/user.py
@@ -30,6 +30,13 @@ class User(UserBase):
     class Config:
         from_attributes = True
 
+class UserThumb(BaseModel):
+    id: UUID
+    friendly_name: str
+
+    class Config:
+        from_attributes = True
+
 class PasswordUpdate(BaseModel):
     old_password: str = Field(max_length=100)
     new_password: str = Field(max_length=100)