Function classify_unclassified 

pub async fn classify_unclassified(
    pool: &PgPool,
    vault: &Vault,
) -> AppResult<u64>

Classifies the files that have no format yet (files from before the format registry, or after format was reset to NULL). Returns how many were classified.

Invariants

• Permission: none (maintenance task of the server, no actor).
• Locks: none (the updates only touch rows whose format is still NULL).
• Audit / notifications / webhooks: none.
• Atomic: one transaction per file (file row and its default-typed versions).