"""notifications.created_at NOT NULL (align schema to the model)

The model has always declared `Notification.created_at: Mapped[datetime]` (NOT NULL) with
`server_default=func.now()`, but migration 0017 created the column without `nullable=False`, so the live
schema allowed NULL — a model/schema drift the new migration drift-test (E1 S2) surfaced. The
server_default has filled every row since day one, so no NULLs exist; enforcing NOT NULL just makes the
schema match the contract the model already promises. Pure DDL, reversible.
"""

from typing import Sequence, Union

from alembic import op

revision: str = "0066_notif_created_at_notnull"
down_revision: Union[str, None] = "0065_plex_detail_fields"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.alter_column("notifications", "created_at", nullable=False)


def downgrade() -> None:
    op.alter_column("notifications", "created_at", nullable=True)