input: 
  from flask import Flask, request
  from flask_sqlalchemy import SQLAlchemy
  
  app = Flask(__name__)
  app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////tmp/test.db'
  db = SQLAlchemy(app)
  
  class Record(db.Model):
      id = db.Column(db.Integer, primary_key=True)
      name = db.Column(db.String(120), unique=True)
  
  db.create_all()
  
  @app.route('/records', methods=['GET'])
  def get_records():
      records = Record.query.all()
      return {'records': [record.name for record in records]}
  
  @app.route('/records', methods=['POST'])
  def create_record():
      record = Record(name=request.json['name'])
      db.session.add(record)
      db.session.commit()
      return {'id': record.id}
  
  @app.route('/records/<int:id>', methods=['PUT'])
  def update_record(id):
      record = Record.query.get(id)
      record.name = request.json['name']
      db.session.commit()
      return {'message': 'Record updated'}
  
  @app.route('/records/<int:id>', methods=['DELETE'])
  def delete_record(id):
      Record.query.filter_by(id=id).delete()
      db.session.commit()
      return {'message': 'Record deleted'}
  
  if __name__ == '__main__':
      app.run(debug=True)
  
output:     
      record = Record.query.get(id)
      if record:
          db.session.delete(record)
          db.session.commit()
          return {'message': 'Record deleted'}
      else:
          return {'message': 'Record not found'}, 404
  