85c05c19a7
产品决定:搜索建议只展示 ts_stat 高频词续接(如'美'→美国/美军/美国政府), 不要真实文章 id 提示(用户认为这种'文章#566871'是噪音,没连续性)。 改动: - SearchSuggestionsResponse 去 title,只剩 query + keywords - SearchService 只查 search_keywords,fallback 路径也只针对 keywords - Feed.vue: 删掉 suggestTitles 状态 + SuggestTitleOption 类型联合, renderSuggestion 简化成 '词' 标签 + 词文本 + 右侧 weight 数字 - 0011 迁移: 删 search_title_suggestions 表 + 3 索引 + trigger + 函数 (trigger 在每篇文章 INSERT/UPDATE 都会跑,删了能省掉无用性能损耗) - 删除: app/models/search_title_suggestion.py + backfill_search_suggestions.py 替换成: app/scripts/refresh_search_keywords.py(只跑一次词频刷新)
122 lines
4.2 KiB
Python
122 lines
4.2 KiB
Python
"""清理废案 search_title_suggestions 相关对象。
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设计:产品迭代决定只展示 keyword 续接词,titles 段(真实文章 id 提示)被砍。
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但 0009 迁移里建的相关对象还在:
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- search_title_suggestions 表 + 3 个 GIN/B-tree 索引
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- articles trigger trg_articles_rebuild_title_suggestions
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- rebuild_title_suggestions() PL/pgSQL 函数
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每篇文章 INSERT/UPDATE 都要跑 trigger(性能损耗),删干净。
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也清理:
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- app/models/search_title_suggestion.py 文件(本次 commit 不删文件,只删 __init__ 引用)
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- app/scripts/backfill_search_suggestions.py 现在回灌的也是 search_title_suggestions
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→ 整体替换成"无 op 脚本"(或者改名为只跑一次 refresh_search_keywords)
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Revision ID: 0011
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Revises: 0010
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Create Date: 2026-06-15
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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 = "0011"
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down_revision: Union[str, None] = "0010"
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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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# 1) 删 trigger(挂 articles 上)
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op.execute("DROP TRIGGER IF EXISTS trg_articles_rebuild_title_suggestions ON articles")
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# 2) 删 trigger 函数
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op.execute("DROP FUNCTION IF EXISTS rebuild_title_suggestions()")
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# 3) 删表 + 索引(ON DELETE CASCADE 让 articles delete 一起清)
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op.drop_index("ix_search_title_suggestions_published", table_name="search_title_suggestions")
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op.drop_index("ix_search_title_suggestions_article", table_name="search_title_suggestions")
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op.drop_index("ix_search_title_suggestions_prefix", table_name="search_title_suggestions")
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op.drop_table("search_title_suggestions")
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def downgrade() -> None:
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# 重新建表(产品迭代回滚时用 — schema 跟 0009 一致)
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op.create_table(
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"search_title_suggestions",
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sa.Column("id", sa.BigInteger, primary_key=True),
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sa.Column(
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"article_id",
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sa.BigInteger,
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sa.ForeignKey("articles.id", ondelete="CASCADE"),
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nullable=False,
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),
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sa.Column("title_lang", sa.String(8), nullable=False, server_default="zh"),
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sa.Column("prefix_keys", sa.ARRAY(sa.Text), nullable=False),
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sa.Column("published_at", sa.DateTime(timezone=True), nullable=True),
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sa.Column(
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"created_at",
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sa.DateTime(timezone=True),
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nullable=False,
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server_default=sa.text("now()"),
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),
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)
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op.create_index(
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"ix_search_title_suggestions_prefix",
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"search_title_suggestions",
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["prefix_keys"],
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postgresql_using="gin",
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)
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op.create_index(
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"ix_search_title_suggestions_article",
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"search_title_suggestions",
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["article_id"],
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)
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op.create_index(
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"ix_search_title_suggestions_published",
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"search_title_suggestions",
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["published_at"],
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)
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op.execute(
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"""
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CREATE OR REPLACE FUNCTION rebuild_title_suggestions() RETURNS TRIGGER AS $$
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DECLARE
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src_text text;
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src_lang text;
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max_len int := 50;
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BEGIN
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DELETE FROM search_title_suggestions WHERE article_id = NEW.id;
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IF NEW.title_zh IS NOT NULL AND length(NEW.title_zh) > 0 THEN
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src_text := NEW.title_zh;
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src_lang := 'zh';
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ELSIF NEW.title IS NOT NULL AND length(NEW.title) > 0 THEN
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src_text := NEW.title;
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src_lang := 'src';
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ELSE
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RETURN NEW;
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END IF;
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src_text := substring(src_text, 1, max_len);
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INSERT INTO search_title_suggestions
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(article_id, title_lang, prefix_keys, published_at)
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SELECT NEW.id, src_lang,
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ARRAY(SELECT substring(src_text, 1, n)
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FROM generate_series(1, length(src_text)) AS n),
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NEW.published_at;
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RETURN NEW;
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END;
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$$ LANGUAGE plpgsql;
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"""
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)
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op.execute(
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"""
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CREATE TRIGGER trg_articles_rebuild_title_suggestions
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AFTER INSERT OR UPDATE OF title_zh, title, published_at ON articles
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FOR EACH ROW EXECUTE FUNCTION rebuild_title_suggestions();
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"""
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)
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