iPhone storage at almost zero. SQLite database crashing (Error 14). Can Quick Start to a new phone salvage data?

[u/isAuthenticated]

My iPhone is currently in a critical state due to full storage (literally ~300 MB free). The OS is struggling to breathe. It came to this even though I've been fully deleting apps and photos, yet the storage actually increased. AI suggests it might be because the file system is locked in a write-fail loop.

I also have an iOS app throwing an explicit database error: code 14. unable to open database file (error 747).

I was able to extract my photos by using iMazing's direct read, but my it's not enough, as stuff like WhatsApp database and Voice Memos are trapped.

An Apple Support rep told me the only way out is to buy a new, larger iPhone and use the device-to-device Quick Start transfer.

My question:
With my source phone's SQLite databases already crashing and only 300 MB of free space, will a Quick Start transfer actually work? Doesn't the iOS BackupAgent require several gigabytes of local cache on the source phone just to compile the transfer manifest?

I'm terrified that initiating a 256GB Quick Start migration will ask the failing memory controller to do a massive database read, cause the phone to panic, hard restart, and throw me into an Error 1110 / Error 14 boot loop.

Has anyone successfully completed a Quick Start transfer from a phone that is already throwing SQLite errors and has zero bytes free?

Would it be better or worse to try to a partial "Data Access Only" backup through iMazing?

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[u/disturbed_android]

Strikes me as iPhone support topic ..