Documented the market system properly, squashed some bugs

core/models.py

@@ -86,10 +86,7 @@ class Account(models.Model):
             name += " (sandbox)"
         return name
 
-    def save(self, *args, **kwargs):
-        """
-        Override the save function to update supported symbols.
-        """
+    def update_info(self, save=True):
         client = self.get_client()
         if client:
             response = client.get_instruments()
@@ -99,6 +96,14 @@ class Account(models.Model):
             self.supported_symbols = supported_symbols
             self.instruments = response
             self.currency = currency
+        if save:
+            self.save()
+
+    def save(self, *args, **kwargs):
+        """
+        Override the save function to update supported symbols.
+        """
+        self.update_info(save=False)
         super().save(*args, **kwargs)
 
     def get_client(self):