Add initial project

backend/repositories/__init__.py

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+"""Repositories module for data access layer."""

backend/repositories/base.py

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+"""Base repository for common database operations."""
+from typing import Generic, TypeVar, Type, List, Optional
+from sqlalchemy.orm import Session
+
+ModelType = TypeVar("ModelType")
+
+
+class BaseRepository(Generic[ModelType]):
+    """Base repository with common CRUD operations."""
+
+    def __init__(self, model: Type[ModelType], db: Session):
+        """Initialize repository with model and database session."""
+        self.model = model
+        self.db = db
+
+    def get_by_id(self, id: int) -> Optional[ModelType]:
+        """Get a single record by ID."""
+        return self.db.query(self.model).filter(self.model.id == id).first()
+
+    def get_all(self) -> List[ModelType]:
+        """Get all records."""
+        return self.db.query(self.model).all()
+
+    def create(self, **kwargs) -> ModelType:
+        """Create a new record."""
+        db_obj = self.model(**kwargs)
+        self.db.add(db_obj)
+        self.db.commit()
+        self.db.refresh(db_obj)
+        return db_obj
+
+    def update(self, id: int, **kwargs) -> Optional[ModelType]:
+        """Update a record by ID."""
+        db_obj = self.get_by_id(id)
+        if db_obj:
+            for key, value in kwargs.items():
+                setattr(db_obj, key, value)
+            self.db.commit()
+            self.db.refresh(db_obj)
+        return db_obj
+
+    def delete(self, id: int) -> bool:
+        """Delete a record by ID."""
+        db_obj = self.get_by_id(id)
+        if db_obj:
+            self.db.delete(db_obj)
+            self.db.commit()
+            return True
+        return False

backend/repositories/challenge_repository.py

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+"""Challenge repository for data access operations."""
+from typing import List, Optional
+from sqlalchemy.orm import Session
+from sqlalchemy import func
+from backend.models.challenge import Challenge
+from backend.repositories.base import BaseRepository
+
+
+class ChallengeRepository(BaseRepository[Challenge]):
+    """Repository for Challenge model operations."""
+
+    def __init__(self, db: Session):
+        """Initialize challenge repository."""
+        super().__init__(Challenge, db)
+
+    def get_by_user_id(self, user_id: int) -> List[Challenge]:
+        """Get all challenges for a user ordered by display_order."""
+        return self.db.query(Challenge).filter(
+            Challenge.user_id == user_id
+        ).order_by(Challenge.display_order.asc()).all()
+
+    def get_by_user_and_id(self, user_id: int, challenge_id: int) -> Optional[Challenge]:
+        """Get a challenge by user ID and challenge ID."""
+        return self.db.query(Challenge).filter(
+            Challenge.id == challenge_id,
+            Challenge.user_id == user_id
+        ).first()
+
+    def get_max_display_order(self, user_id: int) -> Optional[int]:
+        """Get the maximum display_order for a user."""
+        return self.db.query(func.max(Challenge.display_order)).filter(
+            Challenge.user_id == user_id
+        ).scalar()

backend/repositories/user_repository.py

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+"""User repository for data access operations."""
+from typing import Optional
+from sqlalchemy.orm import Session
+from backend.models.user import User
+from backend.repositories.base import BaseRepository
+
+
+class UserRepository(BaseRepository[User]):
+    """Repository for User model operations."""
+
+    def __init__(self, db: Session):
+        """Initialize user repository."""
+        super().__init__(User, db)
+
+    def get_by_username(self, username: str) -> Optional[User]:
+        """Get a user by username."""
+        return self.db.query(User).filter(User.username == username).first()