[rewrite] Minor fixes to models, session generator and example .env

backend/app/database/manager.py

@@ -9,7 +9,7 @@ from app.core.config import settings
 
 from app.database.exceptions import DatabaseError
 
-import app.database.models
+import app.database.models # pylint: disable=unused-import
 
 logger = logging.getLogger(__name__)
 
@@ -34,7 +34,6 @@ def cleanup() -> None:
     engine.dispose()
 
 
-@contextmanager
 def get_session() -> Generator[Session, None, None]:
     with Session(engine) as session:
         yield session

backend/app/database/models/user_model.py

@@ -26,7 +26,7 @@ class User(SQLModel, table=True):
     owned_shops: List["Shop"] = Relationship(back_populates="owner")
     registered_shop: List["Shop"] = Relationship(back_populates="registered_users")
 
-    role: Optional["UserRole"] = Relationship(back_populates="users")
+    user_assigned_role: Optional["UserRole"] = Relationship(back_populates="role_users", sa_relationship_kwargs={"foreign_keys": "[User.user_role_id]"})
     preferences: Optional["UserPreferences"] = Relationship(back_populates="user")
     statistics: Optional["UserStatistics"] = Relationship(back_populates="user_statistics")
 
@@ -45,7 +45,7 @@ class UserRole(SQLModel, table=True):
     id: int = Field(primary_key=True)
     name: str = Field(nullable=False, unique=True, max_length=50)
 
-    users = Relationship(back_populates="role")
+    role_users: List["User"] = Relationship(back_populates="user_assigned_role")
 
 
 class UserStatistics(SQLModel, table=True):