"""phase10.1 alert dedup key

Revision ID: a3f1c8e94d72
Revises: 6b2d95ac3b46
Create Date: 2026-05-30 02:00:00.000000

"""

from collections.abc import Sequence

import sqlalchemy as sa
from alembic import op

revision: str = "a3f1c8e94d72"
down_revision: str | None = "6b2d95ac3b46"
branch_labels: str | Sequence[str] | None = None
depends_on: str | Sequence[str] | None = None


def upgrade() -> None:
    op.add_column("alerts", sa.Column("dedup_key", sa.Text(), nullable=True))
    op.create_index(
        "ix_alerts_watch_dedup",
        "alerts",
        ["watch_id", "dedup_key"],
        unique=True,
        postgresql_where=sa.text("dedup_key IS NOT NULL"),
    )


def downgrade() -> None:
    op.drop_index("ix_alerts_watch_dedup", table_name="alerts")
    op.drop_column("alerts", "dedup_key")