1. Update the Model: In your model (tools/models.py), add the charge and proportion fields to the ProteinChargeCalculator model:

   # tools/models.py
   from django.db import models
   
   class ProteinChargeCalculator(models.Model):
       content = models.TextField()
       created_at = models.DateTimeField(auto_now_add=True)
       charge = models.FloatField()  # New field for charge
       proportion = models.FloatField()  # New field for proportion
   
   #python3 manage.py makemigrations
   #python3 manage.py migrate

2. Update the Form: In your form (tools/forms.py), include the new fields in the ProteinChargeCalculatorForm:

   # tools/forms.py
   from django import forms
   from .models import ProteinChargeCalculator
   
   class ProteinChargeCalculatorForm(forms.ModelForm):
       class Meta:
           model = ProteinChargeCalculator
           fields = ['content', 'charge', 'proportion']  # Include charge and proportion
           widgets = {
               'content': forms.Textarea(attrs={'placeholder': 'Enter your message'})
           }

3. Update the View: In your view (tools/views.py), modify the code to work with the ProteinChargeCalculator model and form:

   # tools/views.py
   from django.shortcuts import render, redirect
   from .forms import ProteinChargeCalculatorForm
   from .models import ProteinChargeCalculator
   
   def chargeandprop(aa_seq):
       """Calculates protein net charge and charged AA proportion
       """
       protseq = aa_seq.upper()
       charge = -0.002
       cp = 0
       aa_charge = {'C': -0.045, 'D': -0.999, 'E': -0.998, 'H': 0.091,
                   'K': 1, 'R': 1, 'Y': -0.001}
       for aa in protseq:
           charge += aa_charge.get(aa, 0)
           if aa in aa_charge:
               cp += 1
       prop = float(cp) / len(aa_seq) * 100
       return charge, prop
   
   def protein_charge_calculator_view(request):
       if request.method == 'POST':
           form = ProteinChargeCalculatorForm(request.POST)
           if form.is_valid():
               content = form.cleaned_data['content']
               charge, prop = chargeandprop(content)
               ProteinChargeCalculator.objects.create(content=content, charge=charge, proportion=prop)
               return redirect('tools:protein_charge_calculator_view')
       else:
           form = ProteinChargeCalculatorForm()
   
       calculators = ProteinChargeCalculator.objects.all()
   
       return render(request, 'tools/protein_charge_calculator_form.html', {'form': form, 'calculators': calculators})

4. Update the Template: In your template (templates/tools/protein_charge_calculator_form.html), include the new fields in the form and display them for saved calculations:

   <!-- templates/tools/protein_charge_calculator_form.html -->
   {% extends "base.html" %}
   
   {% block title %}Protein Charge Calculator{% endblock %}
   
   {% block content %}
   <div class="container">
     <h1 class="text-center">Protein Charge Calculator</h1>
     <form method="post" action="{% url 'tools:protein_charge_calculator_view' %}">
       {% csrf_token %}
   
       {{ form.content.errors }}
       {{ form.content }}

        {{ form.charge }}

        <label for="{{ form.proportion.id_for_label }}">Proportion:</label>
        {{ form.proportion }}

      </form>

      <h2 class="text-center">Saved Calculations:</h2>
      <ul class="list-group">
        {% for calculator in calculators %}
          <li class="list-group-item">
            {{ calculator.content }} - Charge: {{ calculator.charge }} - Proportion: {{ calculator.proportion }} - {{ calculator.created_at }}
          </li>
        {% endfor %}
      </ul>
    </div>
    {% endblock %}

5. Update the URLs: In your urls.py file (assuming you have a urls.py file in your tools app), update the URL patterns to use the new view function:

   # tools/urls.py
   from django.urls import path
   from . import views
   
   urlpatterns = [
       path('protein_charge_calculator/', views.protein_charge_calculator_view, name='protein_charge_calculator_view'),
       # ... your other URLs
   ]