from datetime import datetime
from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
from sqlalchemy import DateTime


MYSQL_TABLE_ARGS = {"mysql_charset": "utf8mb4", "mysql_collate": "utf8mb4_unicode_ci"}


class Base(DeclarativeBase):
    pass


class TimestampMixin:
    created_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, nullable=False)
    updated_at: Mapped[datetime] = mapped_column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow, nullable=False)