SQLite WASM Storage Quota Estimator

// 1. Safe Storage Persistence Request Pattern
async function ensurePersistentStorage() {
  if (!navigator.storage || !navigator.storage.persist) {
    console.warn("StorageManager API not supported in this environment");
    return false;
  }
  
  // First check if already persistent
  const isPersisted = await navigator.storage.persisted();
  if (isPersisted) {
    console.log("Storage is already persistent and immune to LRU eviction");
    return true;
  }
  
  // Request persistence from browser
  const granted = await navigator.storage.persist();
  if (granted) {
    console.log("Storage persistence successfully GRANTED by user/browser");
  } else {
    console.warn("Storage persistence DENIED: origin remains best-effort (LRU evictable)");
  }
  return granted;
}