Models and engines tables have many duplicate names (e.g. 24 ASTRA rows,
210 F-150 rows, 398 "5.7L 350CID V8" rows). Changed get_models() and
get_engines() to use GROUP BY UPPER(name) instead of DISTINCT on id+name
so each model/engine appears only once in the navigation lists.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Implement console/db.py with Database class providing all data access
methods for the console application, plus 36 passing tests in
console/tests/test_db.py covering vehicle navigation, parts catalog,
search, VIN cache, stats, manufacturers, and admin CRUD operations.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
