"""Add single-use actor-bound DataFlow draft reservations."""

from alembic import op

revision = "20260723_210"
down_revision = "20260723_200"
branch_labels = None
depends_on = None


def upgrade() -> None:
    op.execute(
        """
        CREATE TABLE public.dataflow_draft_reservations (
            id UUID PRIMARY KEY,
            dataflow_uid UUID NOT NULL UNIQUE,
            actor_uid UUID NOT NULL
                REFERENCES public.users(id) ON DELETE RESTRICT,
            nonce_hash CHAR(64) NOT NULL UNIQUE,
            expires_at TIMESTAMPTZ NOT NULL,
            consumed_at TIMESTAMPTZ,
            created_at TIMESTAMPTZ NOT NULL DEFAULT CURRENT_TIMESTAMP,
            CHECK (expires_at > created_at)
        );
        CREATE INDEX idx_dataflow_draft_reservation_actor
            ON public.dataflow_draft_reservations(
                actor_uid, expires_at, consumed_at
            );
        """
    )


def downgrade() -> None:
    raise RuntimeError(
        "DataFlow draft reservations are forward-only and cannot downgrade"
    )