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Similar to this question, is IndexedDB guaranteed to be persistent ? ie. Safari will not reclaim disk space if the device is low on memory.
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Even though IndexedDB is a fully functional client-side database for the web, it is not a persistent storage by default. IndexedDB without StorageManager is just a “best-effort” database that can be erased in situations of low disk space on a device.
Thus, it's IndexedDB is actually provided by Safari even on Chrome, Opera or Firefox, see issue #110. If your application must target iPhone 6 or below, it is recommended to include the indexedDB shim before requiring/including Dexie. js. iPhone 7 users will have a Safari engine of version >= 10.3.
The short answer is IndexedDB is vulnerable to malware and physical takeover attacks. It's better than many options because cryptography is done outside the browser execution environment, but it's not totally secure.
More specifically, IndexedDB data is stored in the browser profile folder.
Safari have "No Eviction policy", meaning it will not automatically clean the IndexDB on low disk pressure, without user doing it manually.
IndexDB is one of the fast evolving feature and you can expect to have a different eviction policy any time with no announcement. You should always build with fall back options.
Chrome has explicit persistent storage option which will guarantee no eviction, on user approval for persistent storage and we can expect Safari to do the same sometime, based on their track record of following Chrome in implementing PWA features(though its taking years with super bad documentation).
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