"""add missing performance indexes

Revision ID: c3d4e5f6a7b8
Revises: b7c8d9e0f1a2
Create Date: 2026-03-19 10:00:00.000000

"""

from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = "c3d4e5f6a7b8"
down_revision: Union[str, None] = "59807c4e84ee"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    # Stock universe filtering (strategy engine uses market + market_cap frequently)
    op.create_index("idx_stocks_market", "stocks", ["market"])
    op.create_index(
        "idx_stocks_market_cap", "stocks", [sa.text("market_cap DESC NULLS LAST")]
    )

    # Backtest listing by user (always filtered by user_id + ordered by created_at)
    op.create_index(
        "idx_backtests_user_created",
        "backtests",
        ["user_id", sa.text("created_at DESC")],
    )
    op.create_index("idx_backtests_status", "backtests", ["status"])


def downgrade() -> None:
    op.drop_index("idx_backtests_status", table_name="backtests")
    op.drop_index("idx_backtests_user_created", table_name="backtests")
    op.drop_index("idx_stocks_market_cap", table_name="stocks")
    op.drop_index("idx_stocks_market", table_name="stocks")