Refreshing from QuickBooks Online

1. In QuickBooks Online, run Reports › General Ledger (or Transaction Detail by Account) for the period, with the Customer column shown, and Export to CSV.
2. Run python qbo_to_finicast.py export.csv ledger.csv to flatten QuickBooks' grouped layout into one row per ledger line.
3. Import ledger.csv into the ledger table in upsert mode. Row ids come from each line's contents, so re-importing an overlapping month updates rather than duplicates.

Every report here reads the ledger through the two mapping tables below: accounts (cost code, P&L line and cash category for each QuickBooks account) and customers (QuickBooks Customer:Project to job). A new account or job needs one row in a mapping table, nothing else.