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Templates are Jinja2-based documents for emails, notifications, and dynamic content. Key properties:
PropertyDescription
namespace / nameUnique identifier
titleOptional title template (e.g., email subject)
html_contentJinja2 HTML template
text_contentOptional plain-text fallback
variable_schemaJSON Schema for validating template variables
HTML output is auto-escaped to prevent XSS. Missing variables cause errors (strict mode). Management endpoints: 
POST   /api/v1/templates                                   # Create template
GET    /api/v1/templates                                   # List templates
GET    /api/v1/templates/{id}                              # Get by ID
GET    /api/v1/templates/by-name/{namespace}/{name}        # Get by name
PATCH  /api/v1/templates/{id}                              # Update
DELETE /api/v1/templates/{id}                              # Delete
Runtime endpoints: 
POST   /templates/{id}/render        # Render template with variables
POST   /templates/{id}/send          # Render and send as email