Use internal logger instead of debug/console for logging

Resolve #4104
Resolve #1966
Resolve #1937

src/db/mongodb.ts

@@ -18,6 +18,7 @@ export default db;
  * MongoDB native module (officialy)
  */
 import * as mongodb from 'mongodb';
+import Logger from '../misc/logger';
 
 let mdb: mongodb.Db;
 
@@ -37,3 +38,5 @@ const nativeDbConn = async (): Promise<mongodb.Db> => {
 };
 
 export { nativeDbConn };
+
+export const dbLogger = new Logger('db');