Delete Bexio Account

Delete one bexio integration account from a company (accountant/owner).

Drops the credentials and the sync link. Documents already imported stay — booked ones included — and only lose their link to the account.

A later reconnect re-walks the whole backlog. The row being deleted IS the sync cursor (last_seen_updated_at / last_seen_id / backfill_floor), so a fresh account starts from the floor exactly as reset_bexio_cursor does — burning API quota, tripping rate-limit throttling, and re-ingesting invoices the tenant may since have removed — and every invoice the old account already imported, a second time next to the kept one, since the dedup key includes the account. Delete-then-reconnect is therefore not a cheap round trip; prefer fixing the existing account. (An earlier version of this docstring claimed the opposite, and FastMCP serves it verbatim as the tool description an agent acts on.)