Comment about date format

urlchecker_db.py

@@ -18,6 +18,8 @@ class LogDB:
         # All other tables point to it to be able to group some info
         class Status(BaseModel):
             text = peewee.TextField()
+            # date is in UTC
+            # https://www.sqlite.org/lang_datefunc.html
             timestamp = peewee.TimestampField(
                 constraints=[peewee.SQL("DEFAULT now")]
             )