refactor(backend): solve copilot comments

backend/app/core/.keep

@@ -1,2 +0,0 @@
-# Konfigurace a utility
-

backend/app/core/db.py

@@ -1,6 +1,6 @@
 import os
 from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
-from app.core.base import Base  # Import Base z nového souboru
+from app.core.base import Base
 
 DATABASE_URL = os.getenv("DATABASE_URL")
 if not DATABASE_URL:
@@ -14,15 +14,11 @@ if not DATABASE_URL:
     else:
         raise Exception("Only MariaDB is supported. Please set the DATABASE_URL environment variable.")
 
-# Explicitní import všech modelů, aby byly registrovány v Base.metadata
+# Load all models to register them
+
 from app.models.user import User
 from app.models.transaction import Transaction
 
-from app.models.user import User
-
-# Pokud máš další modely, importuj je zde:
-# from app.models.other_model import OtherModel
-
 ssl_enabled = os.getenv("MARIADB_HOST", "localhost") != "localhost"
 connect_args = {"ssl": {"ssl": True}} if ssl_enabled else {}
 

backend/app/core/queue.py

@@ -32,5 +32,4 @@ def enqueue_email(to: str, subject: str, body: str) -> None:
         loop.create_task(_publish_async(message))
     except RuntimeError:
         asyncio.run(_publish_async(message))
-# ...existing code...
 

backend/app/models/.keep

@@ -1,2 +0,0 @@
-# SQLAlchemy modely
-

backend/app/models/transaction.py

@@ -1,5 +1,5 @@
 from sqlalchemy import Column, Integer, String, Float
-from ..core.db import Base
+from app.core.db import Base
 
 class Transaction(Base):
     __tablename__ = "transaction"

backend/app/models/user.py

@@ -1,6 +1,6 @@
 from sqlalchemy import Column, String
 from fastapi_users.db import SQLAlchemyBaseUserTableUUID
-from ..core.base import Base  # Import Base z base.py
+from app.core.base import Base  # Import Base z base.py
 
 class User(SQLAlchemyBaseUserTableUUID, Base):
     first_name = Column(String(length=100), nullable=True)

backend/app/schemas/.keep

@@ -1,2 +0,0 @@
-# Pydantic schémata
-

backend/app/services/.keep

@@ -1,2 +0,0 @@
-# Business logika
-

backend/app/services/user_service.py

@@ -11,9 +11,9 @@ from fastapi_users.authentication import (
 )
 from fastapi_users.db import SQLAlchemyUserDatabase
 
-from ..models.user import User
-from ..services.db import get_user_db
-from ..core.queue import enqueue_email
+from app.models.user import User
+from app.services.db import get_user_db
+from app.core.queue import enqueue_email
 
 SECRET = os.getenv("SECRET", "CHANGE_ME_SECRET")
 FRONTEND_URL = os.getenv("FRONTEND_URL", "http://localhost:5173")

backend/app/workers/.keep

@@ -1,2 +0,0 @@
-# Background worker
-