adding last updated code

web/app/main.py

 # route for about page
 @main.route('/about')
 def about():
+    # get last updated date
+    last_updated = get_last_date()
     with open('content/about.md', 'r') as f:
         main_text = f.read()
         main_text = markdown.markdown(main_text)
     with open('content/colophon.md', 'r') as f:
         sidebar_text = f.read()
         sidebar_text = markdown.markdown(sidebar_text)
-    return render_template('about.html', main_text=main_text, sidebar_text=sidebar_text)
+    return render_template('about.html', main_text=main_text, sidebar_text=sidebar_text, last_updated=last_updated)
 
 # route for events page
 @main.route('/practice_seminars')

web/app/resources.py

     else:
         book_cover = {'thumbnail': openl_url}
         book.update(book_cover)
-    return book
+    return book
+
+# function to retrieve last updated date from the database
+def get_last_date():
+    resource = Resource.query.order_by(Resource.created.asc()).filter_by(published=True).first()
+    return resource.created.isoformat()

web/app/templates/about.html

 
     <div id="colophon" class="cell-margin text lg:my-16">
         {{ sidebar_text | safe }}
+
+        <hr>Database last updated: {{ last_updated[0:10] }}
     </div>
 </div>
 

web/content/colophon.md

 
 Special thanks to Gary Hall, Rebekka Kiesewetter, Marcell Mars, Toby Steiner, and Samuel Moore, and everyone who has provided feedback on our research or shared suggestions of examples to feature, including the participants of COPIM’s experimental publishing workshop, and Nicolás Arata, Dominique Babini, Maria Fernanda Pampin, Sebastian Nordhoff, Abel Packer, and Armanda Ramalho, and Agatha Morka.
 
-Our appreciation also goes out to the [Next Generation Library Publishing Project](https://educopia.org/next-generation-library-publishing/) for sharing an early catalogue-in-progress version of [SComCat](https://www.scomcat.net/) with us which formed one of the inspirations behind the Compendium.
+Our appreciation also goes out to the [Next Generation Library Publishing Project](https://educopia.org/next-generation-library-publishing/) for sharing an early catalogue-in-progress version of SComCat with us which formed one of the inspirations behind the Compendium.
 ___
 
-Copyright © 2023 [COPIM](https://copim.ac.uk/).
+Copyright © 2023–2024 [COPIM](https://copim.ac.uk/).
 
 Design © 2023 [Joel Galvez](https://joelgalvez.com/selected).