How do I stop anyone deleting filed accounts?

Open this screen in Saral/accounts/settings?tab=Document Protection

Accounts → Settings → Document Protection: the deletion lock. Switched on, every delete on Signed Accounts is refused and the page says so at the top. Anyone may lock; only an Owner unlocks, and must give a reason.

Not what you needed? Inside Saral, ask Kuku (Alt+K) — if it cannot answer, “Ask a human” sends the question to Saral support with the chat attached.