Revert previous changes to range_key/LSI

Author: stevebux

infrastructure/terraform/components/api/ddb_table_letter_queue.tf

@@ -3,16 +3,16 @@ resource "aws_dynamodb_table" "letter_queue" {
   billing_mode = "PAY_PER_REQUEST"
 
   hash_key  = "supplierId"
-  range_key = "queueTimestamp"
+  range_key = "letterId"
 
   ttl {
     attribute_name = "ttl"
     enabled        = true
   }
 
   local_secondary_index {
-    name            = "letterId-index"
-    range_key       = "letterId"
+    name            = "queueTimestamp-index"
+    range_key       = "queueTimestamp"
     projection_type = "ALL"
   }