Takes over the books a user kept elsewhere — a FEC, an XML audit file, an export of journal items, a journal report, a transaction journal, a trial balance, or the export of odoo or xero or quickbooks-online or pennylane or sage-50 or exact-online by name — whole or not at all. Each file is read by the reader of its source; every account of the old chart is matched to one of this company's chart and every old journal to a journal of the company. The codes give a candidate (the same code, the same digits without the padding zeros, or the longest beginning of three digits or more), and what the files say of the old account — its type, its name, the side of its balance — is held against what the chart says the candidate is, never a country: only the same code, not contradicted, is `exact`; anything else is `suggested` with its reason, or `none`. Each old journal is proposed from what its entries touch, never its name — the opening (entries on the first day of a year, balance accounts only), sales, purchases, bank, else the general journal — with its reason under journal_reasons. Call it with dry_run first: it returns the correspondence proposed, the suggestions under mapping.suggested, what is unanswered, and — when everything is answered — what the database would write, rehearsed and rolled back. Show the user every suggested line and its reason first; nothing is posted while one is unconfirmed. Settle each by writing its code under mapping.accounts, or, once the user has read and approved them all, pass accept_suggestions. Every entry is posted through post_entry(); a trial balance becomes the opening entry, on the first day of a year or the day inside it the books were taken over, and the open items beside it (open_items) posted documents that statement matching finds. Imported lines carry no tax and feed no VAT box. The same files twice are refused. The files travel as text, up to 256 KiB in all: a larger export is imported from the terminal with `ekwo import`, which reads it from the disk. Ask the user before the real call.