Initial commit: NextGen PPR System

- FastAPI backend with JWT authentication
- MySQL database with full schema
- Docker Compose orchestration
- CSV data import for 43,208 airports and 519,999 aircraft
- Complete PPR management API
- Modernized replacement for PHP-based system

backend/app/crud/crud_user.py

@@ -0,0 +1,39 @@
+from typing import Optional
+from sqlalchemy.orm import Session
+from app.models.ppr import User
+from app.schemas.ppr import UserCreate
+from app.core.security import get_password_hash, verify_password
+
+
+class CRUDUser:
+    def get(self, db: Session, user_id: int) -> Optional[User]:
+        return db.query(User).filter(User.id == user_id).first()
+
+    def get_by_username(self, db: Session, username: str) -> Optional[User]:
+        return db.query(User).filter(User.username == username).first()
+
+    def create(self, db: Session, obj_in: UserCreate) -> User:
+        hashed_password = get_password_hash(obj_in.password)
+        db_obj = User(
+            username=obj_in.username,
+            password=hashed_password
+        )
+        db.add(db_obj)
+        db.commit()
+        db.refresh(db_obj)
+        return db_obj
+
+    def authenticate(self, db: Session, username: str, password: str) -> Optional[User]:
+        user = self.get_by_username(db, username=username)
+        if not user:
+            return None
+        if not verify_password(password, user.password):
+            return None
+        return user
+
+    def is_active(self, user: User) -> bool:
+        # For future use if we add user status
+        return True
+
+
+user = CRUDUser()