"""Phase 3 strategy adoption: time-based exit + confidence floor removed.

The July 2026 backtest (gate ablation graded under both exit models, plus the
capital-constrained portfolio simulation) concluded:

- The best exit is hold-to-horizon: keep the initial ATR stop and exit at the
  30th trading day's close (+0.50R net/trade vs +0.13R for the S/R target
  exit; simulated book +31.9% vs +23.7% CAGR at the same drawdown). The paper
  trade exit-policy default is now ``time`` (30 trading days).
- The confidence floor adds nothing (identical net/trade with it removed,
  under both exit models) while cutting ~25% of qualified trades. Its default
  is now 0 (off).

Stored rows for these two settings were written under the old semantics, so
they are cleared here and the new code defaults take effect. Re-tune in
Admin -> Activation / Paper-Trade Exit if desired. Note: this changes which
setups qualify and how paper trades close, so Track Record comparability
resets from this deploy.

Revision ID: 015
Revises: 014
Create Date: 2026-07-02 00:00:00.000000

"""
from typing import Sequence, Union

from alembic import op
import sqlalchemy as sa


# revision identifiers, used by Alembic.
revision: str = "015"
down_revision: Union[str, None] = "014"
branch_labels: Union[str, Sequence[str], None] = None
depends_on: Union[str, Sequence[str], None] = None


def upgrade() -> None:
    op.execute(
        sa.text(
            "DELETE FROM system_settings "
            "WHERE key IN ('activation_min_confidence', 'paper_exit_mode')"
        )
    )


def downgrade() -> None:
    # One-way data reset: the old per-key values aren't recoverable. Code
    # defaults apply until re-tuned, so there is nothing to restore.
    pass