Reduce connections in diagram

templates/infrastructure.d2.j2

@@ -15,16 +15,25 @@ external: {
     }
 }
 
-{% for host in hosts %}
-{{ host.key }}: {
-}
-
-{{ host.key }}.backup -> external.restic {
-    style: {
-        stroke: "#0f0"
-        stroke-dash: 3
+classes: {
+    zero_grid: {
+        grid-columns: 3
+        grid-gap: 0
+    }
+    monitored: {
+        style: {
+            fill: "#1E9025"
+        }
+    }
+    backup: {
+        style: {
+            fill: "#0f0"
+        }
     }
 }
+
+{% for host in hosts %}
+{{ host.key }}
 {% endfor %}{# host #}
 
 {% for svc in svcs %}
@@ -36,32 +45,25 @@ external: {
 }
 
 {% for backup in svc.backup or [] %}
-{{ svc.key }} -> {{ svc.host_key }}.backup: {{ backup.name }} {
-    style: {
-        stroke: "#0f0"
-        stroke-dash: 3
-    }
-}
-{% endfor %}{# backup #}
+{{ svc.key }}.'{{ backup.name }}'.class: backup
+{% endfor %}
 
 {% if svc.monitoring %}
-{{ monitoring_key }} -> {{ svc.key }}: {
-    style.stroke: "#1E9025"
-}
+{{ svc.key }}.monitored.class: monitored
 {% endif %}
 
 {% if svc.database %}
 {{ svc.key }} -> {{ db_key }}: {
     style.stroke: "#336791"
 }
-{{ db_key }}.{{ svc.name }}
+{{ db_subkey }}.{{ svc.name }}
 {% endif %}
 
 {% if svc.auth %}
 {{ svc.key }} -> {{ auth_key }}: {
     style.stroke: "#FD4B2D"
 }
-{{ auth_key }}.{{ svc.name }}
+{{ auth_subkey }}.{{ svc.name }}
 {% endif %}
 
 {% if svc.s3 %}
@@ -78,14 +80,11 @@ external.scaleway.s3.{{ svc.name }}
 {{ svc.key }} -> {{ mail_key }}: {
     style.stroke: "#C9B81F"
 }
-{{ mail_key }}.{{ svc.name }}
+{{ mail_subkey }}.{{ svc.name }}
 {% endif %}
 
 {% endfor %}{# svc #}
 
 {% for svc in grid_svcs %}
-{{ svc }}: {
-    grid-columns: 3
-    grid-gap: 0
-}
+{{ svc }}.class: zero_grid
 {% endfor %}