"""
Base model configuration for SQLAlchemy models.
"""

from datetime import datetime
from typing import Any
from sqlalchemy import DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
from sqlalchemy.sql import func


class Base(DeclarativeBase):
    """Base class for all database models."""
    pass


class TimestampMixin:
    """Mixin to add created_at and updated_at timestamps to models."""
    
    created_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        nullable=False
    )
    
    updated_at: Mapped[datetime] = mapped_column(
        DateTime(timezone=True),
        server_default=func.now(),
        onupdate=func.now(),
        nullable=False
    )