"""add regime_snapshots table

Stores the daily AI/Tech regime-change index (one row per date) so the monitor
tab can show a 7/30-day trend. Standalone, observational feature: no other table
or job reads this.

Revision ID: 011
Revises: 010
Create Date: 2026-06-26 00:00:00.000000

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = "011"
down_revision: Union[str, None] = "010"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.create_table(
        "regime_snapshots",
        sa.Column("id", sa.Integer(), nullable=False),
        sa.Column("date", sa.Date(), nullable=False),
        sa.Column("total_score", sa.Float(), nullable=False),
        sa.Column("band", sa.String(length=20), nullable=False),
        sa.Column("breakdown_json", sa.Text(), nullable=False),
        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False),
        sa.PrimaryKeyConstraint("id"),
    )
    op.create_index(
        "uq_regime_snapshots_date", "regime_snapshots", ["date"], unique=True
    )


def downgrade() -> None:
    op.drop_index("uq_regime_snapshots_date", table_name="regime_snapshots")
    op.drop_table("regime_snapshots")
