Error at Query.run when using postman and sequelize

Question

I am receiving this console error when trying to run my postman POST to see if it transfers over into my database.

Server started at http://localhost:5000
Error
    at Query.run (C:\Users\donal\videos\Web-Developement\videojs\vc-be\server\node_modules\sequelize\lib\dialects\postgres\query.js:50:25) 
    at C:\Users\donal\videos\Web-Developement\videojs\vc-be\server\node_modules\sequelize\lib\sequelize.js:313:28
    at processTicksAndRejections (node:internal/process/task_queues:96:5)
    at async PostgresQueryInterface.insert (C:\Users\donal\videos\Web-Developement\videojs\vc-be\server\node_modules\sequelize\lib\dialects\abstract\query-interface.js:297:21)
    at async model.save (C:\Users\donal\videos\Web-Developement\videojs\vc-be\server\node_modules\sequelize\lib\model.js:2424:35)
    at async Function.create (C:\Users\donal\videos\Web-Developement\videojs\vc-be\server\node_modules\sequelize\lib\model.js:1336:12)     
    at async C:\Users\donal\videos\Web-Developement\videojs\vc-be\server\controllers\auth.js:12:18

Here is my code below:

const { Op } = require("sequelize");
const { User } = require('../sequelize');
const bcrypt = require("bcryptjs");
const jwt = require("jsonwebtoken");
const asyncHandler = require('../middlewares/asyncHandler');

// exports.signup = asyncHandler(async (req, res, next) => {
//  console.log('this function works');
// });

exports.signup =  asyncHandler(async (req, res, next) => {
    const user = await User.create(req.body);

    await user.save();

    res.status(200).json({ success: true, data: token });

    console.log('this function works');
    
}); 

and my schema for my database:

const { Sequelize } = require('sequelize');

module.exports = (sequelize, DataTypes) => {
    return sequelize.define("User", {
      id: {
        type: DataTypes.UUID,
        allowNull: false,
        primaryKey: true,
        defaultValue: Sequelize.UUIDV4,
      },
      firstname: {
        type: DataTypes.STRING,
        allowNull: false,
      },
      lastname: {
        type: DataTypes.STRING,
        allowNull: false,
      },
      username: {
        type: DataTypes.STRING,
        allowNull: false,
        unique: true,
      },
      email: {
        type: DataTypes.STRING,
        allowNull: false,
        unique: true,
        validate: {
          isEmail: true,
        },
      },
      password: {
        type: DataTypes.STRING,
        allowNull: false,
        validate: {
          min: 6,
        },
      },
      avatar: {
        type: DataTypes.STRING,
        defaultValue:
          "https://images-wixmp-ed30a86b8c4ca887773594c2.wixmp.com/f/b0b4c759-ad9c-4425-a9f4-ab89e2fd9837/de8cefl-35c0bc59-59b9-42ab-b19f-5c73828bb78e.png?token=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1cm46YXBwOjdlMGQxODg5ODIyNjQzNzNhNWYwZDQxNWVhMGQyNmUwIiwiaXNzIjoidXJuOmFwcDo3ZTBkMTg4OTgyMjY0MzczYTVmMGQ0MTVlYTBkMjZlMCIsIm9iaiI6W1t7InBhdGgiOiJcL2ZcL2IwYjRjNzU5LWFkOWMtNDQyNS1hOWY0LWFiODllMmZkOTgzN1wvZGU4Y2VmbC0zNWMwYmM1OS01OWI5LTQyYWItYjE5Zi01YzczODI4YmI3OGUucG5nIn1dXSwiYXVkIjpbInVybjpzZXJ2aWNlOmZpbGUuZG93bmxvYWQiXX0.81ixeN9b4cfDmfBlskK9CUyAMDtRhYNU7lfwTI8WI5Q",
      },
      cover: {
        type: DataTypes.STRING,
        defaultValue:
          "https://pbs.twimg.com/profile_images/1410507368622919685/AU_Zqm1J_400x400.jpg",
      },
      channelDescription: {
        type: DataTypes.STRING,
      },
      isAdmin: {
        type: DataTypes.BOOLEAN,
        allowNull: false,
        defaultValue: false,
      },
    });
  };

I am new to sequelize and axios. Still trying to figure out why I am getting this error. If anyone can give me some pointers, I'd appreciate it.

I have also included the request.body, to see if there is something wrong with it. Request.Body

UPDATE: I have changed the syntax to isolate the error, it still shows query.run, it now returns the error 500 whenever I use this specific syntax:

exports.signup = async (req, res, next) => {
    try {
        const { username, email, password, firstname, lastname } = req.body;


        //create user document and save in database
        const user = await User.create({
            username,
            email,
            password,
            firstname,
            lastname,
        });

        await user.save();

       

        res.status(201).send(
            'successfully sent!'
        )
    } catch (err) {
        return res.status(500).send('Error occured. Please try again');
    }

};

UPDATE: I have added a picture of the databases, making sure to see if there's any errors there.