Password or PIN protection for opening app (local data encryption)

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See this post in another topic on why there is no in-app encryption of the database:

Researching a 'Zero-Trust' storage layer for deltachat-core-rust — thoughts?

For some background, we already have password protection using SQLCipher and have deprecated it because of way too many problems with it. We implemented this as an experiment, but it has limitations: We store blobs (images, files and other media) in a blob directory rather than inside the database. It is not encrypted even when the database is encrypted. iOS has special handling for SQLite files, allowing to keep them locked when the process is suspended. Encrypted with SQLCipher databases ar…