feat: require gate reset before post-stop reentry

alembic/versions/022_add_paper_trade_reentry_gate_reset.py

@@ -0,0 +1,37 @@
+"""add persistent post-stop gate-reset observation
+
+Revision ID: 022
+Revises: 021
+Create Date: 2026-07-17 00:00:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "022"
+down_revision: Union[str, None] = "021"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "paper_trades",
+        sa.Column("reentry_gate_failed_at", sa.DateTime(timezone=True), nullable=True),
+    )
+    op.add_column(
+        "paper_trades",
+        sa.Column(
+            "reentry_gate_requalified_at",
+            sa.DateTime(timezone=True),
+            nullable=True,
+        ),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("paper_trades", "reentry_gate_requalified_at")
+    op.drop_column("paper_trades", "reentry_gate_failed_at")