55 lines
1.6 KiB
Python
55 lines
1.6 KiB
Python
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"""文章已读记录(per-user)
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- article_reads.user_id BIGINT FK users.id ON DELETE CASCADE
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- article_reads.article_id BIGINT FK articles.id ON DELETE CASCADE
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- article_reads.read_at TIMESTAMPTZ DEFAULT now()
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- 复合主键 (user_id, article_id) — 天然幂等
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Revision ID: 0007
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Revises: 0006
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Create Date: 2026-06-13
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"""
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from __future__ import annotations
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from typing import Sequence, Union
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import sqlalchemy as sa
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from alembic import op
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revision: str = "0007"
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down_revision: Union[str, None] = "0006"
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branch_labels = None
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depends_on = None
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def upgrade() -> None:
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op.create_table(
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"article_reads",
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sa.Column("user_id", sa.BigInteger, nullable=False),
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sa.Column("article_id", sa.BigInteger, nullable=False),
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sa.Column("read_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.text("now()")),
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sa.PrimaryKeyConstraint("user_id", "article_id", name="pk_article_reads"),
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sa.ForeignKeyConstraint(
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"user_id", ["users.id"], ondelete="CASCADE",
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),
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sa.ForeignKeyConstraint(
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"article_id", ["articles.id"], ondelete="CASCADE",
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),
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)
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op.create_index(
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"ix_article_reads_user_read_at",
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"article_reads",
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["user_id", "read_at"],
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)
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op.create_index(
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"ix_article_reads_article",
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"article_reads",
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["article_id"],
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)
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def downgrade() -> None:
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op.drop_index("ix_article_reads_article", table_name="article_reads")
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op.drop_index("ix_article_reads_user_read_at", table_name="article_reads")
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op.drop_table("article_reads")
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