perf(posts): remove content_md from list/search SQL, read stored word counts

src/api/posts/helpers.rs

@@ -63,7 +63,7 @@ pub(super) async fn row_to_post_list(
 
 /// 将数据库行转换为轻量列表项 DTO。
 ///
-/// 不包含 `content_md`/`content_html`，但会临时读取 `content_md` 以计算字数与阅读时长。
+/// 不包含 `content_md`/`content_html`；字数与阅读时长直接读取已持久化的列。
 /// 同步函数，不依赖数据库连接。
 #[cfg(feature = "server")]
 pub(super) fn row_to_post_list_item(row: &tokio_postgres::Row) -> PostListItem {
@@ -79,9 +79,8 @@ pub(super) fn row_to_post_list_item(row: &tokio_postgres::Row) -> PostListItem {
         .filter(|t| !t.is_empty())
         .collect();
 
-    // 临时读取 content_md 计算字数与阅读时长，不存入 DTO。
-    let content_md: String = row.get("content_md");
-    let word_count = count_words(&content_md);
+    let word_count: i32 = row.get("word_count");
+    let reading_time: i32 = row.get("reading_time");
 
     PostListItem {
         id,
@@ -96,8 +95,8 @@ pub(super) fn row_to_post_list_item(row: &tokio_postgres::Row) -> PostListItem {
         deleted_at: row.try_get("deleted_at").ok(),
         tags,
         cover_image: row.get("cover_image"),
-        reading_time: (word_count / 200).max(1),
-        word_count,
+        reading_time: reading_time.max(1) as u32,
+        word_count: word_count.max(0) as u32,
     }
 }
 
@@ -150,6 +149,17 @@ pub(super) async fn row_to_post_full(
         None
     };
 
+    // 读取正文与已持久化的字数/阅读时长；若列尚未回填（旧数据为 0），则现场计算。
+    let content_md: String = row.get("content_md");
+    let stored_word_count: i32 = row.get("word_count");
+    let stored_reading_time: i32 = row.get("reading_time");
+    let (word_count, reading_time) = if stored_word_count > 0 && stored_reading_time > 0 {
+        (stored_word_count as u32, stored_reading_time as u32)
+    } else {
+        let wc = count_words(&content_md);
+        (wc, (wc / 200).max(1))
+    };
+
     let content_html: Option<String> = row.get("content_html");
     let toc_html_row: Option<String> = row.get("toc_html");
 
@@ -157,7 +167,6 @@ pub(super) async fn row_to_post_full(
     let (content_html, toc_html) = if let Some(html) = content_html {
         (html, toc_html_row)
     } else {
-        let content_md: String = row.get("content_md");
         let rendered = crate::api::markdown::render_markdown_enhanced(&content_md);
         (
             rendered.html,
@@ -169,9 +178,6 @@ pub(super) async fn row_to_post_full(
         )
     };
 
-    let content_md: String = row.get("content_md");
-    let word_count = count_words(&content_md);
-
     Post {
         id,
         author_id: row.get("author_id"),
@@ -187,7 +193,7 @@ pub(super) async fn row_to_post_full(
         deleted_at: row.try_get("deleted_at").ok(),
         tags,
         cover_image: row.get("cover_image"),
-        reading_time: (word_count / 200).max(1),
+        reading_time,
         word_count,
         toc_html,
         prev_post,

src/api/posts/list.rs

@@ -82,8 +82,9 @@ pub async fn list_published_posts(
         let rows = client
             .query(
                 "SELECT
-                    p.id, p.author_id, p.title, p.slug, p.summary, p.content_md,
-                    p.status, p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.id, p.author_id, p.title, p.slug, p.summary, p.status,
+                    p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.word_count, p.reading_time,
                     COALESCE(array_agg(t.name) FILTER (WHERE t.name IS NOT NULL), '{}') as tags
                  FROM posts p
                  LEFT JOIN post_tags pt ON p.id = pt.post_id
@@ -139,8 +140,9 @@ pub async fn list_posts(page: i32, per_page: i32) -> Result<PostListResponse, Se
         let rows = client
             .query(
                 "SELECT
-                    p.id, p.author_id, p.title, p.slug, p.summary, p.content_md,
-                    p.status, p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.id, p.author_id, p.title, p.slug, p.summary, p.status,
+                    p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.word_count, p.reading_time,
                     COALESCE(array_agg(t.name) FILTER (WHERE t.name IS NOT NULL), '{}') as tags
                  FROM posts p
                  LEFT JOIN post_tags pt ON p.id = pt.post_id
@@ -198,8 +200,9 @@ pub async fn list_deleted_posts(
         let rows = client
             .query(
                 "SELECT
-                    p.id, p.author_id, p.title, p.slug, p.summary, p.content_md,
-                    p.status, p.published_at, p.created_at, p.updated_at, p.cover_image, p.deleted_at,
+                    p.id, p.author_id, p.title, p.slug, p.summary, p.status,
+                    p.published_at, p.created_at, p.updated_at, p.cover_image, p.deleted_at,
+                    p.word_count, p.reading_time,
                     COALESCE(array_agg(t.name) FILTER (WHERE t.name IS NOT NULL), '{}') as tags
                  FROM posts p
                  LEFT JOIN post_tags pt ON p.id = pt.post_id
@@ -251,8 +254,9 @@ pub async fn get_posts_by_tag(tag_name: String) -> Result<PostListResponse, Serv
         let rows = client
             .query(
                 "SELECT
-                    p.id, p.author_id, p.title, p.slug, p.summary, p.content_md,
-                    p.status, p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.id, p.author_id, p.title, p.slug, p.summary, p.status,
+                    p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.word_count, p.reading_time,
                     COALESCE(array_agg(t2.name) FILTER (WHERE t2.name IS NOT NULL), '{}') as tags
                  FROM posts p
                  JOIN post_tags pt ON p.id = pt.post_id

src/api/posts/read.rs

@@ -75,6 +75,7 @@ pub async fn get_post_by_slug(slug: String) -> Result<SinglePostResponse, Server
                 "SELECT
                     p.id, p.author_id, p.title, p.slug, p.summary, p.content_md, p.content_html, p.toc_html,
                     p.status, p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.word_count, p.reading_time,
                     COALESCE(array_agg(t.name) FILTER (WHERE t.name IS NOT NULL), '{}') as tags,
                     prev.title as prev_title, prev.slug as prev_slug,
                     next.title as next_title, next.slug as next_slug

src/api/posts/rebuild.rs

@@ -75,10 +75,19 @@ pub async fn rebuild_content_html(rebuild_all: bool) -> Result<RebuildResult, Se
                 Some(rendered.toc_html)
             };
 
+            let word_count = crate::utils::text::count_words(&content_md);
+            let reading_time = (word_count / 200).max(1);
+
             match client
                 .execute(
-                    "UPDATE posts SET content_html = $1, toc_html = $2 WHERE id = $3",
-                    &[&rendered.html, &toc_html, &id],
+                    "UPDATE posts SET content_html = $1, toc_html = $2, word_count = $3, reading_time = $4 WHERE id = $5",
+                    &[
+                        &rendered.html,
+                        &toc_html,
+                        &(word_count as i32),
+                        &(reading_time as i32),
+                        &id,
+                    ],
                 )
                 .await
             {

src/api/posts/search.rs

@@ -57,8 +57,9 @@ pub async fn search_posts(query: String) -> Result<PostListResponse, ServerFnErr
         let rows = client
             .query(
                 "SELECT
-                    p.id, p.author_id, p.title, p.slug, p.summary, p.content_md,
-                    p.status, p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.id, p.author_id, p.title, p.slug, p.summary, p.status,
+                    p.published_at, p.created_at, p.updated_at, p.cover_image,
+                    p.word_count, p.reading_time,
                     COALESCE(array_agg(t.name) FILTER (WHERE t.name IS NOT NULL), '{}') as tags,
                     word_similarity(p.search_text, $2) AS sml
                  FROM posts p