create-table.js

var server = require('../server');
var ds = server.dataSources.db;
var lbTables = 
[
'User', 'AccessToken', 'ACL', 'RoleMapping', 'Role', 
 'AnswersForAQuestion','ApplicationUser','Question','Quiz','UsersQuizs'
];
ds.automigrate(lbTables, function(er) {
  if (er) throw er;
  console.log('Loopback tables [' + lbTables + '] created in ', ds.adapter.name);
  ds.disconnect();
});

datasource.json

{
  "mdb": {
    "name": "mdb",
    "connector": "memory"
  },
  "db": {
    "host": "127.0.0.1",
    "port": 5432,
    "database": "EIC_DB",
    "password": "Admin!@#456",
    "name": "db",
    "user": "postgres",
    "connector": "postgresql",
    "min": 5,
    "max": 200,
    "idleTimeoutMillis": 60000
  },
  "eicsfiles": {
    "name": "eicsfiles",
    "connector": "loopback-component-storage",
    "provider": "filesystem",
    "root": "./server/storage"
  }
}