Monthly FIPE price of (fipe_code, year): FIPE's own tables plus the price history back to Dez/2007 (migration 053) — ONE fuel's line, the listing's fuel when FIPE prices it (fipe_series.py explains the rule; mixing fuels drew a zigzag).

A model year FIPE does not price falls back to the 0 km rows the old loader stamped with that year (zero_km: true) — exactly what this showed before the switch; fipe_years.py.

Beside it (migration 058, fipe_outlook.py): market, the monthly median asking price of our ads for this code and year, and forecast, the next 6 months of FIPE with an 80% band — neither for a 0 km stand-in. A plain def: its database work blocks, and as a coroutine it froze the worker for every visitor while it ran.