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/influxdb/module.json

@@ -40,6 +40,29 @@
   "grants": {
     "influxdb-api": "${dir:grants}"
   },
+  "data": {
+    "own": [
+      {
+        "id": "data",
+        "path": "${dir:data}",
+        "class": "valuable",
+        "why": "every consumer's time series"
+      },
+      {
+        "id": "config",
+        "path": "${dir:config}",
+        "class": "valuable",
+        "why": "the server's own configuration and its operator token, made at its first start"
+      }
+    ],
+    "consumers": {
+      "influxdb-api": {
+        "class": "valuable",
+        "in": "data",
+        "why": "a consumer's measurements are the only copy"
+      }
+    }
+  },
   "resources": [
     {
       "id": "mesh-state",
@@ -135,12 +158,5 @@
         }
       }
     ]
-  },
-  "contributions": [
-    {
-      "seat": "node-backup",
-      "kind": "backup",
-      "content": "path ${dir:data}\npath ${dir:config}\n"
-    }
-  ]
+  }
 }