f7004e8d74
P1-1 base.py 时间列改 timezone=True；迁移把 16 表 created_at/updated_at ALTER 为 TIMESTAMPTZ（手写 USING ... AT TIME ZONE 'UTC'）。 P1-3 新增 8 个索引（chapter_reviews/chapter_digests 复合、owner_id、 usage_ledger、rules + jobs/rules 部分索引）。 P2 chapters/foreshadow status CHECK 约束。 迁移链 ad2c4c663daf → b1a2c3d4e5f6 → c2b3d4e5f6a7，upgrade/downgrade 往返无漂移。
33 lines
865 B
Python
33 lines
865 B
Python
"""SQLAlchemy 2.0 声明式基类 + 通用 mixin。"""
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from __future__ import annotations
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import uuid
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from datetime import datetime
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from sqlalchemy import DateTime, Uuid, func, text
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from sqlalchemy.orm import DeclarativeBase, Mapped, mapped_column
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class Base(DeclarativeBase):
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pass
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class UuidPk:
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id: Mapped[uuid.UUID] = mapped_column(
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Uuid, primary_key=True, server_default=text("gen_random_uuid()")
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)
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class CreatedAt:
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# TIMESTAMPTZ：服务端 `func.now()` 兜底，无 client 端 default（统一存 UTC）。
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created_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True), server_default=func.now(), nullable=False
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)
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class TimestampedMixin(CreatedAt):
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updated_at: Mapped[datetime] = mapped_column(
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DateTime(timezone=True), server_default=func.now(), onupdate=func.now(), nullable=False
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)
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