Potentially closes 1319
## Note
- `persistor.purge` returns a promise, we should wait for the resolved results before reloading, instead of just adding an arbitrary `setTimeout`.
- Perhaps the `setTimeout` method is to ignore a super-long or hanged purge (not sure), but it wouldn't be right since it would end up in a limbo state.
- Log errors to get clues for future.
- Reduced code by moving the reload to `finally`.
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