added data models

src/baby_monitor/models/__init__.py

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+from .auth import LoginRequest, LoginResponse
+
+__all__ = ["LoginRequest", "LoginResponse"]

src/baby_monitor/models/auth.py

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+"""Authentication models for request and response validation."""
+
+from pydantic import BaseModel
+
+
+class LoginRequest(BaseModel):
+    """Request model for user login."""
+
+    username: str
+    password: str
+
+
+class LoginResponse(BaseModel):
+    """Response model for successful login."""
+
+    message: str
+    username: str
+    access_token: str
+    token_type: str = "bearer"

src/baby_monitor/models/db/__init__.py

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+"""Database models package."""
+
+from baby_monitor.models.db.user import User
+
+__all__ = ["User"]

src/baby_monitor/models/db/user.py

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+"""Database models."""
+
+from sqlalchemy import Column, Integer, String, DateTime
+from datetime import datetime
+
+from baby_monitor.repositories.dependencies.get_database import Base
+
+
+class User(Base):
+    """User database model."""
+
+    __tablename__ = "users"
+
+    id = Column(Integer, primary_key=True, index=True)
+    username = Column(String, unique=True, index=True, nullable=False)
+    hashed_password = Column(String, nullable=False)
+    created_at = Column(DateTime, default=datetime.utcnow, nullable=False)
+
+    def __repr__(self) -> str:
+        return f"<User(id={self.id}, username='{self.username}')>"