信用分期系统，源码搭建,信用分期系统如何实现贷款审批流程？

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from flask import Flask,render_template, request, redirect, url_for fromflask_sqlalchemy import SQLAlchemy app =Flask(__name__) app.config['SQLALCHEMY_DATABASE_URI']= 'sqlite:///credit_installment.db' db =SQLAlchemy(app) class User(db.Model):id = db.Column(db.Integer,primary_key=True) username =db.Column(db.String(80), unique=True,nullable=False) password =db.Column(db.String(120), nullable=False)class LoanApplication(db.Model):id = db.Column(db.Integer,primary_key=True) user_id = db.Column(db.Integer,db.ForeignKey('user.id'), nullable=False)amount = db.Column(db.Float, nullable=False) term =db.Column(db.Integer, nullable=False) status =db.Column(db.String(20), nullable=False)@app.route('/')def index(): returnrender_template('index.html')@app.route('/login',methods=['POST']) deflogin(): username =request.form['username'] password =request.form['password'] user =User.query.filter_by(username=username, password=password).first()if user: returnredirect(url_for('loan_application'))else: return '用户名或密码错误'@app.route('/loan_application',methods=['GET', 'POST'])def loan_application(): ifrequest.method == 'POST': user_id =request.form['user_id'] amount =float(request.form['amount']) term =int(request.form['term']) application =LoanApplication(user_id=user_id, amount=amount, term=term,status='待审批') db.session.add(application)db.session.commit() return '贷款申请已提交，等待审批'else: returnrender_template('loan_application.html')if __name__ == '__main__':app.run(debug=True)