"""Phase 1 safety fields: paper mode + circuit breaker."""
from typing import Sequence, Union
import sqlalchemy as sa
from alembic import op

revision: str = "008"
down_revision: Union[str, None] = "007"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    with op.batch_alter_table("subscriptions") as batch_op:
        # Paper mode: trades are simulated, no Hyperliquid call.
        batch_op.add_column(sa.Column("paper_mode", sa.Boolean(), nullable=False, server_default="0"))
        # Circuit breaker state.
        batch_op.add_column(sa.Column("circuit_breaker_tripped_at", sa.DateTime(), nullable=True))
        batch_op.add_column(sa.Column("circuit_breaker_reason",     sa.String(32), nullable=True))


def downgrade() -> None:
    with op.batch_alter_table("subscriptions") as batch_op:
        batch_op.drop_column("circuit_breaker_reason")
        batch_op.drop_column("circuit_breaker_tripped_at")
        batch_op.drop_column("paper_mode")