IndexedDB 滚动归档与时间窗口清理实践

概述滚动归档提升主库轻量性。本文示例按时间窗口迁移与清理。迁移与清理function openDB(name) { return new Promise((resolve, reject) => { const r = indexedDB.open(name, 1); r.onupgradeneeded = () => { const db = r.result; if (!db.objectStoreNames.contains('main')) db.createObjectStore('main', { keyPath:'id' }); if (!db.objectStoreNames.contains('archive')) db.createObjectStore('archive', { keyPath:'id' }); }; r.onsuccess = () => resolve(r.result); r.onerror = () => reject(r.error); }); } async function rollArchive(cutoffTs) { const db = await openDB('roll'); const tx = db.transaction(['main','archive'],'readwrite'); const m = tx.objectStore('main'); const a = tx.objectStore('archive'); const req = m.openCursor(); await new Promise((res, rej) => { req.onsuccess = e => { const c = e.target.result; if (c) { const v = c.value; if ((v.updatedAt || 0) < cutoffTs) { a.put(v); m.delete(c.primaryKey); } c.continue(); } else res(); }; req.onerror = () => rej(req.error); }); await new Promise((res, rej) => { tx.oncomplete = res; tx.onerror = () => rej(tx.error); }); db.close(); }