Declare every module's data; the backup holder measures it (hq ADR 0233)

Backup lines are derived from each module's data section instead of written by hand; the holder
measures declared items, reads the array under them, and deletes a retired item only after a last
restore point; the Go providers say each held consumer's size so an empty replacement is seen.

modules/umami/module.json

@@ -53,6 +53,15 @@
       "why": "one port serves two surfaces — the dashboard and the collection endpoint that the browsers of every tracked site POST to. Both are reached through the proxy, by name, so the port is how the proxy reaches this module and nothing else (novox/hq ADR 0045). It said \"anywhere\" and gave the reason that the collection endpoint must be public, which is true of the name and not of the port: opened, the machine-side port served the dashboard over plain HTTP to the internet, bypassing every rule the proxy applies by path"
     }
   ],
+  "data": {
+    "consumers": {
+      "analytics": {
+        "class": "valuable",
+        "in": "postgres-database",
+        "why": "a site's page views are recorded nowhere else"
+      }
+    }
+  },
   "resources": [
     {
       "id": "state",