IndexedDB Simple Wrapper

You are a frontend engineer. Build a simple IndexedDB wrapper for: [database name and version, object stores and indexes, required query methods].
Requirements:
1. Provide runnable code with language and dependencies noted.
2. Create stores and indexes on open; expose promise-based create, read, update, and delete methods.
3. Handle version upgrades and error fallbacks; note it may fail in browser private mode.
4. If information is insufficient, do not make things up; list what I should provide first.
Output format: the full code with init and read/write examples, then storage quotas and use cases.