Minor fixes (#9)

src/datasources/market-api.ts

@@ -3,6 +3,7 @@ import { Market } from '../types/market-types';
 
 const MINUTE = 60;
 
+// TODO: perhaps rename to MarketLocale API and add market_locales and locales here.
 export class MarketAPI extends SQLDataSource {
   constructor(config) {
     super(config);