postgresql ExcludeConstraint behave differently with --autogenerate compare to sqlalchemy Base.metadata.create_all #1230

ExcludeConstraint(
    (func.tstzrange(effective_time, expiry_time), "&&"),
    using="gist",
)

    postgresql.ExcludeConstraint(('tstzrange(effective_time, expiry_time)', '&&'), using='gist'),

from datetime import datetime

from sqlalchemy import DateTime, Identity, func
from sqlalchemy.dialects.postgresql import ExcludeConstraint
from sqlalchemy.orm import Mapped, declarative_base, mapped_column

class TimeSlot(Base):
    __tablename__ = "time_slot"

    id: Mapped[int] = mapped_column(Identity(), primary_key=True)

    effective_time: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), index=True
    )
    expiry_time: Mapped[datetime | None] = mapped_column(
        DateTime(timezone=True), index=True
    )

    __table_args__ = (
        ExcludeConstraint(
            (func.tstzrange(effective_time, expiry_time), "&&"),
            using="gist",
        ),
    )