Function openReadonlyDatabase

apps/desktop/main/worker/query/session/core.ts:30–39

(sessionId: string)

 * 打开数据库（只读模式，不使用缓存）
 */
export function openReadonlyDatabase(sessionId: string): Database.Database | null {
  const dbPath = getDbPath(sessionId)
  try {
    const db = new Database(dbPath, { readonly: true })
    db.pragma('journal_mode = WAL')
    return db
  } catch {
    return null
  }
}