feat(database): encrypt transactions data

7project/backend/alembic/versions/2025_10_29_1326-46b9e702e83f_add_encrypted_type.py

@@ -0,0 +1,47 @@
+"""Add encrypted type
+
+Revision ID: 46b9e702e83f
+Revises: 1f2a3c4d5e6f
+Create Date: 2025-10-29 13:26:24.568523
+
+"""
+from typing import Sequence, Union
+
+import sqlalchemy_utils
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import mysql
+
+# revision identifiers, used by Alembic.
+revision: str = '46b9e702e83f'
+down_revision: Union[str, Sequence[str], None] = '1f2a3c4d5e6f'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('transaction', 'amount',
+               existing_type=mysql.FLOAT(),
+               type_=sqlalchemy_utils.types.encrypted.encrypted_type.EncryptedType(),
+               existing_nullable=False)
+    op.alter_column('transaction', 'description',
+               existing_type=mysql.VARCHAR(length=255),
+               type_=sqlalchemy_utils.types.encrypted.encrypted_type.EncryptedType(),
+               existing_nullable=True)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column('transaction', 'description',
+               existing_type=sqlalchemy_utils.types.encrypted.encrypted_type.EncryptedType(),
+               type_=mysql.VARCHAR(length=255),
+               existing_nullable=True)
+    op.alter_column('transaction', 'amount',
+               existing_type=sqlalchemy_utils.types.encrypted.encrypted_type.EncryptedType(),
+               type_=mysql.FLOAT(),
+               existing_nullable=False)
+    # ### end Alembic commands ###

7project/backend/app/models/transaction.py

@@ -1,15 +1,21 @@
+import os
 from fastapi_users_db_sqlalchemy import GUID
 from sqlalchemy import Column, Integer, String, Float, ForeignKey, Date, func
 from sqlalchemy.orm import relationship
+from sqlalchemy_utils import EncryptedType
+from sqlalchemy_utils.types.encrypted.encrypted_type import FernetEngine
+
 from app.core.base import Base
 from app.models.categories import association_table
 
+SECRET_KEY = os.environ.get("DB_ENCRYPTION_KEY", "localdev")
+
 
 class Transaction(Base):
     __tablename__ = "transaction"
     id = Column(Integer, primary_key=True, autoincrement=True)
-    amount = Column(Float, nullable=False)
-    description = Column(String(length=255), nullable=True)
+    amount = Column(EncryptedType(Float, SECRET_KEY, engine=FernetEngine), nullable=False)
+    description = Column(EncryptedType(String(length=255), SECRET_KEY, engine=FernetEngine), nullable=True)
     date = Column(Date, nullable=False, server_default=func.current_date())
     user_id = Column(GUID, ForeignKey("user.id"), nullable=False)
 

7project/backend/requirements.txt

@@ -54,6 +54,7 @@ sentry-sdk==2.42.0
 six==1.17.0
 sniffio==1.3.1
 SQLAlchemy==2.0.43
+SQLAlchemy-Utils==0.42.0
 starlette==0.48.0
 tomli==2.2.1
 typing-inspection==0.4.1