Properties with underscores in their name cannot be indexed

Steps to reproduce

1. create a model with a property name that contains an underscore in it (e.g. short_name).
2. set that property to be indexed (e.g. "index": true)
3. call pg.autoupdate() (e.g. where app.datasources.pg);

Current Behavior

1. The index is added
2. Then the index is dropped

Expected Behavior

1. The index is added

Additional information

The bug shown here is a bad regular expression in migration.js (on or about line 777):
const propNameRegEx = new RegExp('^' + self.table(model) + '_([^_]+)_idx');

The simple fix is:
const propNameRegEx = new RegExp('^' + self.table(model) + '_(.*)(?:_idx)$');

Inizia in migration.js intorno alla riga 777 e riproduci la configurazione del modello segnalata con una proprietà contenente underscore, quindi chiama pg.autoupdate(). Verifica che l’indice esistente rimanga dopo la migrazione e che il nome della proprietà venga associato correttamente quando contiene underscore.