Three days to two seconds. Same contract. Zero errors.

class ContractGenerator:
    def generate(self, listing, template_type):
        """Generate a contract PDF from verified data."""
        template = ContractTemplate.objects.get(
            type=template_type,
            is_active=True,
        )

        # Pull variables from verified database records
        context = {
            'company': listing.company,
            'address': listing.company.billing_address,
            'terms': listing.agreed_terms,
            'pricing': listing.pricing_schedule,
            'clauses': template.get_active_clauses(),
            'generated_at': timezone.now(),
        }

        # Validate all variables before rendering
        template.validate_context(context)

        # Render HTML → PDF
        html = render_to_string(
            template.django_template_path,
            context,
        )
        pdf = weasyprint.HTML(string=html).write_pdf()

        # Store with audit trail
        return Contract.objects.create(
            listing=listing,
            template_version=template.version,
            clause_versions=template.clause_version_map(),
            pdf_hash=hashlib.sha256(pdf).hexdigest(),
            pdf_file=ContentFile(pdf, name=f'{listing.slug}.pdf'),
        )

{# base_service_agreement.html #}
{# All 16 contract types inherit from this base #}

<h1>Service Agreement</h1>
<p>Between {{ company.name }} and Pushing Pixels.</p>

{% block scope %}
  <h2>§1 Scope of Services</h2>
  <p>{{ terms.scope_description }}</p>
{% endblock %}

{% block compensation %}
  <h2>§2 Compensation</h2>
  <p>Monthly rate: €{{ pricing.monthly_rate|floatformat:2 }}</p>
{% endblock %}

{# §3-§12: shared standard clauses #}
{% for clause in clauses %}
  <h2>§{{ clause.number }} {{ clause.title }}</h2>
  {{ clause.body|safe }}
{% endfor %}