diff --git a/terraform/gcp/modules/mysql/mysql.tf b/terraform/gcp/modules/mysql/mysql.tf
index 15f0e00ee..c79f144c0 100644
--- a/terraform/gcp/modules/mysql/mysql.tf
+++ b/terraform/gcp/modules/mysql/mysql.tf
@@ -143,10 +143,12 @@ resource "google_sql_database_instance" "sigstore" {
   }
 }
 
+/*
 moved {
   from = google_sql_database_instance.trillian
   to   = google_sql_database_instance.sigstore
 }
+*/
 
 resource "google_sql_database_instance" "read_replica" {
   for_each = toset(var.replica_zones)
diff --git a/terraform/gcp/modules/sigstore/sigstore.tf b/terraform/gcp/modules/sigstore/sigstore.tf
index 845335aca..05597bc6d 100644
--- a/terraform/gcp/modules/sigstore/sigstore.tf
+++ b/terraform/gcp/modules/sigstore/sigstore.tf
@@ -346,7 +346,7 @@ module "ctlog_shards" {
 
   for_each = var.ctlog_shards
 
-  instance_name = format("%s-ctlog-%s", var.cluster_name, each.key)
+  instance_name = each.value["instance_name"] != "" ? each.value["instance_name"] : format("%s-ctlog-%s", var.cluster_name, each.key)
 
   project_id = var.project_id
   region     = var.region
@@ -354,10 +354,7 @@ module "ctlog_shards" {
   cluster_name = var.cluster_name
 
   database_version = each.value["mysql_db_version"]
-
-  // NB: This is commented out so that we pick up the defaults
-  // for the particular environment consistently.
-  //mysql_tier              = var.mysql_tier
+  tier             = each.value["mysql_tier"] != "" ? each.value["mysql_tier"] : var.mysql_tier
 
   replica_zones = var.mysql_replica_zones
   replica_tier  = var.mysql_replica_tier
diff --git a/terraform/gcp/modules/sigstore/variables.tf b/terraform/gcp/modules/sigstore/variables.tf
index 6ea17c432..3fedc7978 100644
--- a/terraform/gcp/modules/sigstore/variables.tf
+++ b/terraform/gcp/modules/sigstore/variables.tf
@@ -342,6 +342,8 @@ variable "dns_domain_name" {
 variable "ctlog_shards" {
   type = map(object({
     mysql_db_version = string
+    mysql_tier       = string
+    instance_name    = optional(string)
   }))
 
   description = "Map of CTLog shards to create. If keys are '2022' and '2023', it would create 2 independent CTLog Cloud MySql instances named sigstore-staging-ctlog-2022 and sigstore-staging-ctlog-2023."