Switch demo trading to 5m short-term swing setups (plan 3.1)

- The model now submits a pending setup (direction, zone, confirm price,
  validity); the executor enters at market once a 5m close confirms a
  dip into support or a rejection from resistance, and cancels the setup
  when the zone breaks, the trigger is missed or the stop is too far
- Stop beyond the confirmation extreme by 0.5 x ATR14(5m), skipped above
  1%; fixed take-profit ladders from the fill price (long 60/30/10 at
  +0.5/0.75/1%, short 80/20 at -0.5/0.75%); 4h time stop
- While holding, the model may only keep or exit
- Drop the long-term angle from the program, API, tables and page

backend/alembic/versions/20261015_e8b25c71d4a9_trading_drop_angle.py

@@ -0,0 +1,31 @@
+"""trading drop angle
+
+Revision ID: e8b25c71d4a9
+Revises: c3f19d7a2e58
+Create Date: 2026-10-15 13:30:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = 'e8b25c71d4a9'
+down_revision: Union[str, Sequence[str], None] = 'c3f19d7a2e58'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema."""
+    # 用户决定模拟盘只做短线（2026-10-15），不再有角度之分
+    op.drop_column('trading_symbols', 'angle')
+    op.drop_column('trading_analyses', 'angle')
+
+
+def downgrade() -> None:
+    """Downgrade schema."""
+    op.add_column('trading_analyses', sa.Column('angle', sa.String(length=8), nullable=False, server_default='short'))
+    op.add_column('trading_symbols', sa.Column('angle', sa.String(length=8), nullable=False, server_default='short'))