perf(P1): 批量插入性能悬崖 — insert 循环内逐行 prefetchKeys（每行 await drainChain 排空后台链），compaction 在链上数秒时每行阻塞数秒 → kv 后端 10 万行插入 353s；改为批级预加载本批 PK 一次，实测 353s→12.5s（28 倍）/ opfs 25s；新增 kv/opfs 双后端 10 万行回归（性能护栏+索引完整+崩溃恢复），aria-cache 测试同步适配显式 flush

tests/engine/aria-prod-load.test.ts

@@ -290,4 +290,83 @@ describe('AriaEngine — 生产负载验证', () => {
     expect(await engine2.find('big', { table: 'big', where: { tag: 't3' } })).toHaveLength(5000);
     await engine2.close();
   }, 180000);
+
+  it('10 万行 kv 后端（含索引）：完整查询 + 崩溃恢复（v0.6.1-perf 回归）', async () => {
+    const dbName = uniqueDB();
+    const engine = new AriaEngine({
+      storageBackend: 'kv',
+      memtableSizeThreshold: 512 * 1024,
+      checkpointInterval: 30000,
+      walSyncMode: 'full',
+    });
+    await engine.open(dbName, 1);
+    await engine.createTable(SCHEMA());
+
+    const TOTAL = 100000;
+    const t0 = Date.now();
+    for (let batch = 0; batch < TOTAL / 1000; batch++) {
+      const rows = [] as Record<string, unknown>[];
+      for (let i = 0; i < 1000; i++) {
+        const idx = batch * 1000 + i;
+        rows.push({ id: `k${idx}`, val: idx, tag: `t${idx % 10}`, name: `User${idx}` });
+      }
+      await engine.insert('big', rows);
+    }
+    const insertMs = Date.now() - t0;
+    // 性能护栏：修复前 353s（batch 32 起每批 8~11s 性能悬崖），修复后 <30s
+    console.log(`10万行 kv 插入耗时: ${insertMs}ms`);
+    expect(insertMs).toBeLessThan(60000);
+    expect(await engine.count('big')).toBe(TOTAL);
+
+    // 全部 10 个 tag 索引查询完整
+    for (let t = 0; t < 10; t++) {
+      const viaIdx = await engine.find('big', { table: 'big', where: { tag: `t${t}` } });
+      expect(viaIdx.length).toBe(10000);
+    }
+
+    // 崩溃恢复
+    await (engine as any).backend.close();
+    (engine as any).opened = false;
+    const engine2 = new AriaEngine({
+      storageBackend: 'kv',
+      memtableSizeThreshold: 512 * 1024,
+      checkpointInterval: 30000,
+      walSyncMode: 'full',
+    });
+    await engine2.open(dbName, 1);
+    expect(await engine2.count('big')).toBe(TOTAL);
+    expect(await engine2.find('big', { table: 'big', where: { tag: 't7' } })).toHaveLength(10000);
+    await engine2.close();
+  }, 180000);
+
+  it('10 万行 opfs 后端（含索引）：完整查询（v0.6.1-perf 回归）', async () => {
+    const engine = new AriaEngine({
+      storageBackend: 'opfs',
+      memtableSizeThreshold: 512 * 1024,
+      checkpointInterval: 30000,
+      walSyncMode: 'full',
+    });
+    await engine.open(uniqueDB(), 1);
+    await engine.createTable(SCHEMA());
+
+    const TOTAL = 100000;
+    const t0 = Date.now();
+    for (let batch = 0; batch < TOTAL / 1000; batch++) {
+      const rows = [] as Record<string, unknown>[];
+      for (let i = 0; i < 1000; i++) {
+        const idx = batch * 1000 + i;
+        rows.push({ id: `k${idx}`, val: idx, tag: `t${idx % 10}`, name: `User${idx}` });
+      }
+      await engine.insert('big', rows);
+    }
+    const insertMs = Date.now() - t0;
+    console.log(`10万行 opfs 插入耗时: ${insertMs}ms`);
+    expect(insertMs).toBeLessThan(90000);
+    expect(await engine.count('big')).toBe(TOTAL);
+    for (let t = 0; t < 10; t++) {
+      const viaIdx = await engine.find('big', { table: 'big', where: { tag: `t${t}` } });
+      expect(viaIdx.length).toBe(10000);
+    }
+    await engine.close();
+  }, 180000);
 });