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backend/alembic/versions/20260815_03_candle_amount_turnover.py

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+"""candles add amount/turnover columns
+
+Revision ID: 20260815_03
+Revises: 20260815_02
+Create Date: 2026-08-15
+
+- amount   成交额（元）：TDX .day 原生 float32（元）/ Tushare daily amount 千元×1000
+- turnover 换手率（%）：Tushare daily_basic.turnover_rate（2000 年起）
+均为可空列——历史回补前为 NULL，前端 tooltip 显示 "—"。
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+revision: str = "20260815_03"
+down_revision: Union[str, Sequence[str], None] = "20260815_02"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.add_column("candles", sa.Column("amount", sa.Float(), nullable=True))
+    op.add_column("candles", sa.Column("turnover", sa.Float(), nullable=True))
+
+
+def downgrade() -> None:
+    op.drop_column("candles", "turnover")
+    op.drop_column("candles", "amount")