diff --git a/terraform/acm.tf b/terraform/acm.tf
index 90781fb..ebdf6c0 100644
--- a/terraform/acm.tf
+++ b/terraform/acm.tf
@@ -14,7 +14,13 @@
 #   3. Run terraform apply. Until step 2 completes, this data source finds no
 #      ISSUED certificate and the plan fails closed.
 data "aws_acm_certificate" "orders" {
+  count       = var.attach_custom_domain ? 1 : 0
   domain      = var.domain_name
   statuses    = ["ISSUED"]
   most_recent = true
 }
+
+moved {
+  from = data.aws_acm_certificate.orders
+  to   = data.aws_acm_certificate.orders[0]
+}
diff --git a/terraform/alarms.tf b/terraform/alarms.tf
index 4541885..49132ee 100644
--- a/terraform/alarms.tf
+++ b/terraform/alarms.tf
@@ -12,7 +12,7 @@
 # here for throttle coverage.
 
 locals {
-  alarm_functions = {
+  alarm_functions = local.is_prod ? {
     "submit-order" = {
       function_name       = aws_lambda_function.submit_order.function_name
       duration_threshold  = 8000
@@ -49,7 +49,7 @@ locals {
       duration_timeout    = "60s"
       duration_datapoints = 1
     }
-  }
+  } : {}
 }
 
 resource "aws_cloudwatch_metric_alarm" "lambda_errors" {
@@ -65,7 +65,7 @@ resource "aws_cloudwatch_metric_alarm" "lambda_errors" {
   threshold           = 0
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     FunctionName = each.value.function_name
@@ -85,7 +85,7 @@ resource "aws_cloudwatch_metric_alarm" "lambda_throttles" {
   threshold           = 0
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     FunctionName = each.value.function_name
@@ -106,7 +106,7 @@ resource "aws_cloudwatch_metric_alarm" "lambda_duration" {
   threshold           = each.value.duration_threshold
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     FunctionName = each.value.function_name
@@ -118,6 +118,8 @@ resource "aws_cloudwatch_metric_alarm" "lambda_duration" {
 # ---------------------------------------------------------------------------
 
 resource "aws_cloudwatch_metric_alarm" "orders_read_throttle" {
+  count = local.is_prod ? 1 : 0
+
   alarm_name          = "${local.project}-orders-read-throttle"
   alarm_description   = "orders table read requests were throttled in the last 5 minutes."
   namespace           = "AWS/DynamoDB"
@@ -128,7 +130,7 @@ resource "aws_cloudwatch_metric_alarm" "orders_read_throttle" {
   threshold           = 0
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     TableName = aws_dynamodb_table.orders.name
@@ -136,6 +138,8 @@ resource "aws_cloudwatch_metric_alarm" "orders_read_throttle" {
 }
 
 resource "aws_cloudwatch_metric_alarm" "orders_write_throttle" {
+  count = local.is_prod ? 1 : 0
+
   alarm_name          = "${local.project}-orders-write-throttle"
   alarm_description   = "orders table write requests were throttled in the last 5 minutes."
   namespace           = "AWS/DynamoDB"
@@ -146,7 +150,7 @@ resource "aws_cloudwatch_metric_alarm" "orders_write_throttle" {
   threshold           = 0
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     TableName = aws_dynamodb_table.orders.name
@@ -158,6 +162,8 @@ resource "aws_cloudwatch_metric_alarm" "orders_write_throttle" {
 # ---------------------------------------------------------------------------
 
 resource "aws_cloudwatch_metric_alarm" "api_5xx" {
+  count = local.is_prod ? 1 : 0
+
   alarm_name          = "${local.project}-order-api-5xx"
   alarm_description   = "OrderApi returned one or more 5xx responses in 5 minutes."
   namespace           = "AWS/ApiGateway"
@@ -168,7 +174,7 @@ resource "aws_cloudwatch_metric_alarm" "api_5xx" {
   threshold           = 0
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     ApiId = aws_apigatewayv2_api.order_api.id
@@ -178,6 +184,8 @@ resource "aws_cloudwatch_metric_alarm" "api_5xx" {
 # Threshold raised and 2-of-3 datapoints, to absorb the routine 401s the
 # token-based admin authorizer produces without paging.
 resource "aws_cloudwatch_metric_alarm" "api_4xx" {
+  count = local.is_prod ? 1 : 0
+
   alarm_name          = "${local.project}-order-api-4xx"
   alarm_description   = "OrderApi 4xx responses exceeded 20 in 5 minutes (beyond routine auth noise)."
   namespace           = "AWS/ApiGateway"
@@ -189,7 +197,7 @@ resource "aws_cloudwatch_metric_alarm" "api_4xx" {
   threshold           = 20
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     ApiId = aws_apigatewayv2_api.order_api.id
@@ -197,6 +205,8 @@ resource "aws_cloudwatch_metric_alarm" "api_4xx" {
 }
 
 resource "aws_cloudwatch_metric_alarm" "api_latency" {
+  count = local.is_prod ? 1 : 0
+
   alarm_name          = "${local.project}-order-api-latency"
   alarm_description   = "OrderApi p99 latency exceeded 3000ms."
   namespace           = "AWS/ApiGateway"
@@ -208,9 +218,34 @@ resource "aws_cloudwatch_metric_alarm" "api_latency" {
   threshold           = 3000
   comparison_operator = "GreaterThanThreshold"
   treat_missing_data  = "notBreaching"
-  alarm_actions       = [data.aws_sns_topic.site_alerts.arn]
+  alarm_actions       = [data.aws_sns_topic.site_alerts[0].arn]
 
   dimensions = {
     ApiId = aws_apigatewayv2_api.order_api.id
   }
 }
+
+moved {
+  from = aws_cloudwatch_metric_alarm.orders_read_throttle
+  to   = aws_cloudwatch_metric_alarm.orders_read_throttle[0]
+}
+
+moved {
+  from = aws_cloudwatch_metric_alarm.orders_write_throttle
+  to   = aws_cloudwatch_metric_alarm.orders_write_throttle[0]
+}
+
+moved {
+  from = aws_cloudwatch_metric_alarm.api_5xx
+  to   = aws_cloudwatch_metric_alarm.api_5xx[0]
+}
+
+moved {
+  from = aws_cloudwatch_metric_alarm.api_4xx
+  to   = aws_cloudwatch_metric_alarm.api_4xx[0]
+}
+
+moved {
+  from = aws_cloudwatch_metric_alarm.api_latency
+  to   = aws_cloudwatch_metric_alarm.api_latency[0]
+}
diff --git a/terraform/cloudfront.tf b/terraform/cloudfront.tf
index 60b7f25..d11ec46 100644
--- a/terraform/cloudfront.tf
+++ b/terraform/cloudfront.tf
@@ -191,12 +191,15 @@ resource "aws_cloudfront_distribution" "form" {
 
   viewer_certificate {
     cloudfront_default_certificate = !var.attach_custom_domain
-    acm_certificate_arn            = var.attach_custom_domain ? data.aws_acm_certificate.orders.arn : null
+    acm_certificate_arn            = var.attach_custom_domain ? data.aws_acm_certificate.orders[0].arn : null
     ssl_support_method             = var.attach_custom_domain ? "sni-only" : null
     minimum_protocol_version       = var.attach_custom_domain ? "TLSv1.2_2021" : null
   }
 
   lifecycle {
+    # prevent_destroy cannot interpolate. Keep it on so a tagged apply cannot
+    # destroy the live distribution; tear down a leftover dev distribution
+    # from the AWS console.
     prevent_destroy = true
   }
 }
diff --git a/terraform/data.tf b/terraform/data.tf
index 0733a3f..a21a972 100644
--- a/terraform/data.tf
+++ b/terraform/data.tf
@@ -6,13 +6,20 @@ data "aws_caller_identity" "current" {}
 check "correct_account" {
   assert {
     condition     = data.aws_caller_identity.current.account_id == local.account_id
-    error_message = "This configuration targets account ${local.account_id}, but the credentials resolve to ${data.aws_caller_identity.current.account_id}."
+    error_message = "This configuration targets account ${local.account_id} (${var.environment}), but the credentials resolve to ${data.aws_caller_identity.current.account_id}."
   }
 }
 
 # Alarm sink owned by seahaven-org-baseline, not by this configuration.
+# Looked up only in prod because CloudWatch alarms are skipped in dev.
 data "aws_sns_topic" "site_alerts" {
-  name = "site-alerts"
+  count = local.is_prod ? 1 : 0
+  name  = "site-alerts"
+}
+
+moved {
+  from = data.aws_sns_topic.site_alerts
+  to   = data.aws_sns_topic.site_alerts[0]
 }
 
 # Shared CloudFront WAF WebACL (audit M-17), published to Parameter Store by the
@@ -40,3 +47,24 @@ check "google_client_id_present" {
     error_message = "SSM parameter ${local.google_client_id_param} is missing or empty; create it out of band before apply."
   }
 }
+
+check "dev_has_no_paychex" {
+  assert {
+    condition     = local.is_prod || var.checkcomponents_queue_url == ""
+    error_message = "checkcomponents_queue_url must be empty in non-prod so aggregate-orders cannot send to the prod Paychex queue."
+  }
+}
+
+check "checkcomponents_pair" {
+  assert {
+    condition     = (var.checkcomponents_queue_url == "") == (var.checkcomponents_queue_arn == "")
+    error_message = "checkcomponents_queue_url and checkcomponents_queue_arn must both be set or both be empty."
+  }
+}
+
+check "dev_has_no_custom_domain" {
+  assert {
+    condition     = local.is_prod || !var.attach_custom_domain
+    error_message = "attach_custom_domain must be false in non-prod; use the CloudFront distribution domain."
+  }
+}
diff --git a/terraform/dynamodb.tf b/terraform/dynamodb.tf
index 32634b8..55fbe91 100644
--- a/terraform/dynamodb.tf
+++ b/terraform/dynamodb.tf
@@ -1,14 +1,18 @@
 # Single-table store for orders, roster entries and weekly settings.
 #
-# Deletion protection and point-in-time recovery are both on: this table holds
-# the only copy of submitted orders, and a rebuild would lose payroll history.
+# Deletion protection and point-in-time recovery are on in prod: this table
+# holds the only copy of submitted orders, and a rebuild would lose payroll
+# history. Dev is disposable (PITR and deletion protection off).
+# lifecycle.prevent_destroy cannot interpolate, so it stays true in both
+# environments. Destroy a leftover dev table from the AWS console after
+# setting deletion_protection_enabled = false in a follow-up apply.
 resource "aws_dynamodb_table" "orders" {
   name         = local.table_name
   billing_mode = "PAY_PER_REQUEST"
   hash_key     = "PK"
   range_key    = "SK"
 
-  deletion_protection_enabled = true
+  deletion_protection_enabled = local.is_prod
 
   attribute {
     name = "PK"
@@ -26,7 +30,7 @@ resource "aws_dynamodb_table" "orders" {
   }
 
   point_in_time_recovery {
-    enabled = true
+    enabled = local.is_prod
   }
 
   lifecycle {
diff --git a/terraform/events.tf b/terraform/events.tf
index 4c1abd5..736fc68 100644
--- a/terraform/events.tf
+++ b/terraform/events.tf
@@ -62,7 +62,7 @@ resource "aws_cloudwatch_event_rule" "schedule" {
   name                = "${local.project}-${each.key}"
   description         = each.value.description
   schedule_expression = each.value.schedule
-  state               = "ENABLED"
+  state               = local.is_prod ? "ENABLED" : "DISABLED"
 }
 
 resource "aws_cloudwatch_event_target" "schedule" {
diff --git a/terraform/hcp_iam.tf b/terraform/hcp_iam.tf
index b49e8c8..0c04085 100644
--- a/terraform/hcp_iam.tf
+++ b/terraform/hcp_iam.tf
@@ -4,14 +4,14 @@
 # Live seahaven-hcptf-iam-management DenySelfMutation blocks DetachRolePolicy
 # and PutRolePolicy on hcptf-* (including this role). Import apply sequence:
 #   1. seahaven-org-baseline scripts/create-hcptf-bootstrap-roles.sh
-#        --account prod --allow-workspace meal-order-manager-prod
+#        --account prod|dev --allow-workspace meal-order-manager-<env>
 #   2. Point this workspace's TFC_AWS_* at hcptf-bootstrap /
 #      hcptf-bootstrap-plan (workspace vars, never a project set).
 #   3. One Manual apply (import + detach seahaven-hcptf-iam-management +
 #      put scoped inline).
 #   4. Point TFC_AWS_* back at hcptf-meal-order-manager / hcptf-meal-order-manager-plan.
 #   5. Re-run the script without --allow-workspace to pin trust back to
-#      iam-bootstrap-prod only.
+#      iam-bootstrap-<env> only.
 # seahaven-lambda-execution-boundary remains seahaven-lambda-execution-boundary-meal-order-manager.
 
 import {
@@ -70,7 +70,7 @@ data "aws_iam_policy_document" "hcptf_apply_trust" {
       test     = "StringEquals"
       variable = "app.terraform.io:sub"
       values = [
-        "organization:seahaven:project:seahaven-prod:workspace:meal-order-manager-prod:run_phase:apply",
+        "organization:seahaven:project:${local.hcp_project}:workspace:${local.hcp_workspace}:run_phase:apply",
       ]
     }
   }
@@ -97,7 +97,7 @@ data "aws_iam_policy_document" "hcptf_plan_trust" {
       test     = "StringEquals"
       variable = "app.terraform.io:sub"
       values = [
-        "organization:seahaven:project:seahaven-prod:workspace:meal-order-manager-prod:run_phase:plan",
+        "organization:seahaven:project:${local.hcp_project}:workspace:${local.hcp_workspace}:run_phase:plan",
       ]
     }
   }
diff --git a/terraform/iam.tf b/terraform/iam.tf
index a40d6a3..c55e82e 100644
--- a/terraform/iam.tf
+++ b/terraform/iam.tf
@@ -252,11 +252,14 @@ data "aws_iam_policy_document" "aggregate_orders" {
     resources = [aws_lambda_function.slack_notifier.arn]
   }
 
-  statement {
-    sid       = "CheckcomponentsSend"
-    effect    = "Allow"
-    actions   = ["sqs:SendMessage"]
-    resources = [var.checkcomponents_queue_arn]
+  dynamic "statement" {
+    for_each = var.checkcomponents_queue_arn != "" ? [var.checkcomponents_queue_arn] : []
+    content {
+      sid       = "CheckcomponentsSend"
+      effect    = "Allow"
+      actions   = ["sqs:SendMessage"]
+      resources = [statement.value]
+    }
   }
 }
 
diff --git a/terraform/locals.tf b/terraform/locals.tf
index 4ddaa1f..d63dc38 100644
--- a/terraform/locals.tf
+++ b/terraform/locals.tf
@@ -1,6 +1,9 @@
 locals {
-  project    = "meal-order-manager"
-  account_id = "011934824531"
+  project       = "meal-order-manager"
+  is_prod       = var.environment == "prod"
+  account_id    = local.is_prod ? "011934824531" : "710827005802"
+  hcp_project   = "seahaven-${var.environment}"
+  hcp_workspace = "${local.project}-${var.environment}"
 
   # Lambda execution roles under /tf-managed/ carry the per-workload ceiling
   # (PLAT-52). githubdeploy-meal-order-manager-weekly-menu must not.
diff --git a/terraform/logs.tf b/terraform/logs.tf
index d53f453..1097f89 100644
--- a/terraform/logs.tf
+++ b/terraform/logs.tf
@@ -7,11 +7,11 @@ resource "aws_cloudwatch_log_group" "function" {
   for_each = local.function_packages
 
   name              = "/aws/lambda/${local.project}-${replace(each.key, "_", "-")}"
-  retention_in_days = 60
+  retention_in_days = local.is_prod ? 60 : 14
 }
 
 # Longer than the Lambda groups on purpose, for request-level forensics.
 resource "aws_cloudwatch_log_group" "api_access" {
   name              = "/aws/apigateway/${local.project}"
-  retention_in_days = 90
+  retention_in_days = local.is_prod ? 90 : 14
 }
diff --git a/terraform/providers.tf b/terraform/providers.tf
index 2e67825..36ac9ec 100644
--- a/terraform/providers.tf
+++ b/terraform/providers.tf
@@ -3,9 +3,10 @@ provider "aws" {
 
   default_tags {
     tags = {
-      Project   = "meal-order-manager"
-      ManagedBy = "terraform"
-      Workspace = "meal-order-manager-prod"
+      Project     = "meal-order-manager"
+      Environment = var.environment
+      ManagedBy   = "terraform"
+      Workspace   = "meal-order-manager-${var.environment}"
     }
   }
 }
diff --git a/terraform/terraform.tfvars.example b/terraform/terraform.tfvars.example
index 0930a9b..46b0311 100644
--- a/terraform/terraform.tfvars.example
+++ b/terraform/terraform.tfvars.example
@@ -1,25 +1,30 @@
-# Values for the meal-order-manager-prod HCP Terraform workspace.
+# Workspace variable reference for meal-order-manager HCP workspaces.
 # Set these as workspace variables; this file is a reference, not an input.
 
+# HCP workspace stage. Selects account 011934824531 (prod) or 710827005802 (dev).
+# Required. meal-order-manager-prod must set "prod" in the same cut as this
+# variable is added so a prod plan does not target seahaven-dev.
+environment = "prod"
+
 # Region every resource is created in.
 aws_region = "us-east-1"
 
 # Custom domain for the order form. An ISSUED ACM certificate for this domain
-# must already exist in us-east-1 (see acm.tf). Attach only at DNS cutover.
-domain_name           = "orders.seahaven.com"
-attach_custom_domain  = false
+# must already exist in us-east-1 (see acm.tf). Keep false in dev.
+domain_name          = "orders.seahaven.com"
+attach_custom_domain = false
 
 # ARN of the out-of-band Secrets Manager secret holding the Slack bot token.
 # Only the ARN is used; the value never enters Terraform state.
 slack_bot_secret_arn = "arn:aws:secretsmanager:us-east-1:011934824531:secret:meal-order-manager/slack-bot-token-XXXXXX"
 
 # Slack channel that receives meal order notifications. Written to
-# /meal-order-manager/slack-channel-id.
+# /meal-order-manager/slack-channel-id. Use a sandbox channel in dev.
 slack_channel_id = "C00000000000"
 
 # Portal Cognito pools and public app clients accepted by the meals API.
 # The primary pair is required. extra_trust lists additional pools so
-# portal-dev and portal-prod tokens can both call this prod meals stack.
+# portal-dev and portal-prod tokens can both call this meals stack.
 portal_cognito_issuer   = "https://cognito-idp.us-east-1.amazonaws.com/us-east-1_EXAMPLE"
 portal_cognito_audience = "examplepublicappclientid"
 portal_cognito_extra_trust = [
@@ -28,3 +33,9 @@ portal_cognito_extra_trust = [
     audience = "exampleprodappclientid"
   },
 ]
+
+# paychex-checkcomponents SQS. Defaults in variables.tf are the prod queue.
+# meal-order-manager-dev must set both to empty so aggregate-orders cannot
+# SendMessage to prod Paychex.
+# checkcomponents_queue_url = ""
+# checkcomponents_queue_arn = ""
diff --git a/terraform/variables.tf b/terraform/variables.tf
index fef5bc9..90d95b9 100644
--- a/terraform/variables.tf
+++ b/terraform/variables.tf
@@ -4,6 +4,16 @@ variable "aws_region" {
   default     = "us-east-1"
 }
 
+variable "environment" {
+  description = "HCP workspace stage. Selects account and workspace name."
+  type        = string
+
+  validation {
+    condition     = contains(["dev", "prod"], var.environment)
+    error_message = "environment must be \"dev\" or \"prod\"."
+  }
+}
+
 variable "domain_name" {
   description = "Custom domain served by the CloudFront distribution when attach_custom_domain is true. An ISSUED ACM certificate for this domain must already exist in us-east-1 (see acm.tf)."
   type        = string
diff --git a/terraform/versions.tf b/terraform/versions.tf
index 5136781..749b0fa 100644
--- a/terraform/versions.tf
+++ b/terraform/versions.tf
@@ -20,7 +20,7 @@ terraform {
     organization = "seahaven"
 
     workspaces {
-      name = "meal-order-manager-prod"
+      tags = ["app:meal-order-manager"]
     }
   }
 }