Reindex subsequent quotes on deletion

quotes-api/README.md

@@ -112,3 +112,5 @@ DELETE /quotes/:id
 ```BASH
 curl --request DELETE --header 'X-Quotes-API-Key: $API_KEY' 'https://ladylilia.com/quotes/api/quotes/666'
 ```
+
+*Note: all subsequent quotes are reindexed*

quotes-api/app.py

@@ -109,6 +109,10 @@ class QuoteResource(flask_restful.Resource):
             flask_restful.abort(404, message='Quote {0} does not exist'.format(id))
         db.session.delete(quote)
         db.session.commit()
+        q = db.session.query(Quote).filter(Quote.id > id)
+        for quote in q.all():
+            quote.id -= 1
+            db.session.commit()
         return None, 204