[PRM-134-v2] removed unindexed attributes

Author: steph-torres-nhs

infrastructure/dynamo_db.tf

@@ -433,21 +433,9 @@ module "alarm_state_history_table" {
       name = "TimeCreated"
       type = "N"
     },
-    {
-      name = "History"
-      type = "S"
-    },
     {
       name = "LastUpdated"
       type = "N"
-    },
-    {
-      name = "ChannelId"
-      type = "S"
-    },
-    {
-      name = "SlackTimetamp"
-      type = "S"
     }
   ]