Fix Dynu inventory by removing unsupported regexreplace usage

infrastructure/terraform/dynu/README.md

@@ -73,6 +73,37 @@ These are generated outputs meant for operator review before use in production.
 
 ## Troubleshooting
 
+### Plan shows a large wall of `+` values under outputs
+
+Cause:
+
+Terraform is planning to save **new output values** to state (for example, live records from `data.dynu_dns_records.root`). This is not creating DNS records by itself.
+
+How to verify:
+
+- Output-only changes appear under `Changes to Outputs`.
+- Real DNS changes appear as `dynu_dns_record` resource create/update/delete actions.
+
+Use:
+
+```bash
+terraform apply -refresh-only
+```
+
+to persist refreshed data source and output values only.
+
+### Error: `There is no function named "regexreplace"`
+
+Cause:
+
+`regexreplace` is not a Terraform function. Resource-name slugification should not be implemented in Terraform HCL for this workflow.
+
+Fix:
+
+- Keep `inventory.tf` focused on reading live records via `data.dynu_dns_records.root`.
+- Keep Terraform outputs simple (for example, `<domain_id>/<record_id>` mappings).
+- Let `scripts/generate-brownfield-records.py` generate Terraform-safe resource names with Python `tf_name(record)`.
+
 ### Error: `'"'"'dynu_dns_records'"'"'`
 
 Cause:

infrastructure/terraform/dynu/inventory.tf

@@ -1,16 +1,3 @@
 data "dynu_dns_records" "root" {
   hostname = var.dynu_root_domain
 }
-
-locals {
-  dynu_dns_record_name_map = {
-    for record in data.dynu_dns_records.root.records :
-    format(
-      "%s_%s",
-      can(regex("^[a-z]", regexreplace(replace(lower(format("%s_%s", record.hostname, record.record_type)), "*", "wildcard"), "[^a-z0-9]+", "_")))
-      ? trim(regexreplace(replace(lower(format("%s_%s", record.hostname, record.record_type)), "*", "wildcard"), "[^a-z0-9]+", "_"), "_")
-      : format("record_%s", trim(regexreplace(replace(lower(format("%s_%s", record.hostname, record.record_type)), "*", "wildcard"), "[^a-z0-9]+", "_"), "_")),
-      record.id
-    ) => record
-  }
-}

infrastructure/terraform/dynu/outputs.tf

@@ -39,9 +39,9 @@ output "dynu_dns_hostnames" {
 }
 
 output "dynu_dns_record_import_ids" {
-  description = "Map of generated Terraform resource names to provider import IDs in domain_id/record_id format."
+  description = "Map of Dynu DNS record identity to provider import IDs in domain_id/record_id format."
   value = {
-    for name, record in local.dynu_dns_record_name_map :
+    for record in data.dynu_dns_records.root.records :
-    name => format("%s/%s", record.domain_id, record.id)
+    format("%s/%s/%s", record.hostname, record.record_type, record.id) => format("%s/%s", record.domain_id, record.id)
   }
 }