Implement ADMIN_MODIFY_DB logs

When an admin requests /admin/umbrella/edit and the request succeeds, an
ADMIN_MODIFY_DB log is kept. `Database.update` will keep track of the
updated columns.

1 files changed, 9 insertions, 1 deletions

diff --git a/jimbrella/admin_log.py b/jimbrella/admin_log.py
index 8b5bb09..622abec 100644
--- a/jimbrella/admin_log.py
+++ b/jimbrella/admin_log.py
@@ -106,7 +106,15 @@ class AdminLog:
                     "{name} missed the due for umbrella #{key}. " + tenant_info
                 )
             elif event == "ADMIN_MODIFY_DB":
-                description = "{admin_name} changed {column} of umbrella #{serial} from {past_value} to {new_value}."
+                if not entry["past_value"]:
+                    description = "{admin_name} set {column} of umbrella #{serial} to {new_value}."
+                elif not entry["new_value"]:
+                    description = "{admin_name} cleared {column} of umbrella #{serial} (was {past_value})."
+                else:
+                    description = (
+                        "{admin_name} changed {column} of umbrella #{serial} "
+                        "from {past_value} to {new_value}."
+                    )
 
             friendly_logs.append(
                 {