guke
51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
"""comparison_record 加 updated_at 列(报警水位)+ 回填现有行 + 索引
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新增 updated_at:server_default + onupdate = func.now()(DB 时钟)。比价失败报警 worker 用它做
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单调水位(WHERE updated_at > watermark)。加列后回填现有行 = created_at,避免冷启动 max(updated_at)
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为 NULL;再置 NOT NULL + 建索引 ix_comparison_updated(水位查询按它)。batch 模式兼容 SQLite。
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Revision ID: comparison_updated_at
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Revises: deepseek_v4_flash_price
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Create Date: 2026-08-04 00:00:00.000000
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"""
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from collections.abc import Sequence
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import sqlalchemy as sa
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from alembic import op
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revision: str = "comparison_updated_at"
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down_revision: str | Sequence[str] | None = "deepseek_v4_flash_price"
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branch_labels: str | Sequence[str] | None = None
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depends_on: str | Sequence[str] | None = None
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def upgrade() -> None:
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# 1) 先加可空列(不带 default,避免各库对 add-column-with-default 的差异)
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with op.batch_alter_table("comparison_record", schema=None) as batch_op:
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batch_op.add_column(sa.Column("updated_at", sa.DateTime(timezone=True), nullable=True))
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# 2) 回填现有行 = created_at(全新环境表为空,回填 no-op)
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op.get_bind().execute(
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sa.text(
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"UPDATE comparison_record SET updated_at = created_at WHERE updated_at IS NULL"
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)
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)
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# 3) 置 NOT NULL + server_default + 建索引
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with op.batch_alter_table("comparison_record", schema=None) as batch_op:
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batch_op.alter_column(
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"updated_at",
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existing_type=sa.DateTime(timezone=True),
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nullable=False,
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server_default=sa.text("CURRENT_TIMESTAMP"),
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)
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batch_op.create_index("ix_comparison_updated", ["updated_at"], unique=False)
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def downgrade() -> None:
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with op.batch_alter_table("comparison_record", schema=None) as batch_op:
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batch_op.drop_index("ix_comparison_updated")
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batch_op.drop_column("updated_at")
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