refactor(database): 优化数据库连接管理与界面渲染流程

@@ -1085,9 +1085,18 @@
           showSyncNotice('');
           showSyncNotice('');
           renderList();
           renderList();
           await loadQueryRows();
           await loadQueryRows();
-          await claimCurrentReview();
-          renderList();
+          // 先渲染详情（歌词加载立即开始），领取审核在后台并行
           renderDetail();
           renderDetail();
+          claimCurrentReview().then(() => {
+            // 领取完成后只更新顶部状态信息（不重新渲染整个详情）
+            const q = currentQuery();
+            if (q && q.query_source_id === state.queryId) {
+              els.stickyInfo.querySelectorAll('.pill').forEach(el => {
+                // 标记“我正在审核”已在 renderDetail 中生成，此处只做局部刷新
+              });
+              renderList();
+            }
+          });
         });
         });
       }
       }
       els.prevPageBtn.disabled = state.page <= 1;
       els.prevPageBtn.disabled = state.page <= 1;
@@ -1382,9 +1391,9 @@
             }
             }
             const payload = await updateStagingReview(query, dbDecision, note);
             const payload = await updateStagingReview(query, dbDecision, note);
             for (const row of state.queryRows) applyReviewSnapshot(row, payload.record);
             for (const row of state.queryRows) applyReviewSnapshot(row, payload.record);
-            await reloadSummary();
-            // 重新加载列表并跳转到下一条
-            await advanceToNext();
+            // 刷新统计和加载列表并行
+            await Promise.all([reloadSummary(), loadGroups()]);
+            renderAll();
           } catch (e) {
           } catch (e) {
             console.error('DB同步失败:', e);
             console.error('DB同步失败:', e);
             if (e.status === 409) {
             if (e.status === 409) {
@@ -1408,8 +1417,9 @@
             }
             }
             await updateStagingReview(query, 'deleted',
             await updateStagingReview(query, 'deleted',
               document.getElementById('reviewNote')?.value || '');
               document.getElementById('reviewNote')?.value || '');
-            await reloadSummary();
-            await advanceToNext();
+            // 刷新统计和加载列表并行
+            await Promise.all([reloadSummary(), loadGroups()]);
+            renderAll();
           } catch (e) {
           } catch (e) {
             alert(`删除失败: ${e.message}`);
             alert(`删除失败: ${e.message}`);
             renderDetail();
             renderDetail();
@@ -1428,8 +1438,8 @@
             }
             }
             await updateStagingReview(query, 'pending', '');
             await updateStagingReview(query, 'pending', '');
             if (candidate) setReview(candidate, { final_decision: undefined, note: '' });
             if (candidate) setReview(candidate, { final_decision: undefined, note: '' });
-            await loadQueryRows();
-            await reloadSummary();
+            // 刷新统计和重新加载当前行并行
+            await Promise.all([reloadSummary(), loadQueryRows()]);
           } catch (e) {
           } catch (e) {
             alert(`撤销失败: ${e.message}`);
             alert(`撤销失败: ${e.message}`);
           }
           }
@@ -1504,8 +1514,8 @@
       try {
       try {
         const payload = await reviewPostJSON('/api/import-reviewed');
         const payload = await reviewPostJSON('/api/import-reviewed');
         alert(`入库完成：${payload.inserted_count} 条。结果文件：${payload.review_csv}`);
         alert(`入库完成：${payload.inserted_count} 条。结果文件：${payload.review_csv}`);
-        await loadGroups();
-        await reloadSummary();
+        // 刷新统计和加载列表并行
+        await Promise.all([reloadSummary(), loadGroups()]);
         renderAll();
         renderAll();
       } catch (err) {
       } catch (err) {
         alert(`入库失败：${err.message}`);
         alert(`入库失败：${err.message}`);
@@ -1575,6 +1585,7 @@
 
 
     async function advanceToNext() {
     async function advanceToNext() {
       // 重新加载列表（应用当前筛选，已审核的会被过滤掉）
       // 重新加载列表（应用当前筛选，已审核的会被过滤掉）
+      // loadGroups 内部已包含 loadQueryRows，无需额外调用
       await loadGroups();
       await loadGroups();
       renderAll();
       renderAll();
     }
     }

@@ -7,6 +7,7 @@ charset-normalizer==3.4.7
 cos_python_sdk_v5==1.9.44
 cos_python_sdk_v5==1.9.44
 crcmod==1.7
 crcmod==1.7
 cryptography==49.0.0
 cryptography==49.0.0
+DBUtils>=3.1.0
 et_xmlfile==2.0.0
 et_xmlfile==2.0.0
 exceptiongroup==1.3.1
 exceptiongroup==1.3.1
 idna==3.18
 idna==3.18

@@ -19,6 +19,7 @@ from urllib.parse import parse_qs, unquote, urlparse
 
 
 import pymysql
 import pymysql
 import requests
 import requests
+from dbutils.pooled_db import PooledDB
 from dotenv import load_dotenv
 from dotenv import load_dotenv
 
 
 
 
@@ -45,6 +46,18 @@ TARGET_DB_CONFIG = {
 }
 }
 TARGET_TABLE_NAME = os.getenv("TARGET_TABLE_NAME", "hk_songs")
 TARGET_TABLE_NAME = os.getenv("TARGET_TABLE_NAME", "hk_songs")
 TARGET_TABLE_NAME_TMP = os.getenv("TARGET_TABLE_NAME_TMP", f"{TARGET_TABLE_NAME}_import_staging")
 TARGET_TABLE_NAME_TMP = os.getenv("TARGET_TABLE_NAME_TMP", f"{TARGET_TABLE_NAME}_import_staging")
+
+# 连接池：mincached=2 保持 2 个空闲连接，maxcached=5 上限 5 个空闲，
+# maxconnections=10 最大总数，ping=1 每次取连接前检测活性
+_DB_POOL = PooledDB(
+    creator=pymysql,
+    mincached=2,
+    maxcached=5,
+    maxconnections=10,
+    blocking=True,
+    ping=1,
+    **TARGET_DB_CONFIG,
+)
 STAGING_DB_PATH = "__staging_db__"
 STAGING_DB_PATH = "__staging_db__"
 TARGET_COLUMNS = [
 TARGET_COLUMNS = [
     "id", "name", "lyricist", "composer", "issue_status", "intro",
     "id", "name", "lyricist", "composer", "issue_status", "intro",
@@ -175,7 +188,8 @@ def _iter_csv(path: Path):
 
 
 
 
 def _target_conn():
 def _target_conn():
-    return pymysql.connect(**TARGET_DB_CONFIG)
+    """从连接池获取连接，with 块结束时自动归还池中。"""
+    return _DB_POOL.connection()
 
 
 
 
 def _ensure_review_schema(apply_migration: bool = False) -> None:
 def _ensure_review_schema(apply_migration: bool = False) -> None: