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/supabase/module.json

@@ -58,6 +58,34 @@
   "binds": {
     "route": "${dir:state}/route.json"
   },
+  "data": {
+    "own": [
+      {
+        "id": "db",
+        "path": "${dir:db-data}",
+        "class": "valuable",
+        "why": "every table; copied as live files, which may not restore \u2014 a dump is wanted"
+      },
+      {
+        "id": "storage",
+        "path": "${dir:storage}",
+        "class": "valuable",
+        "why": "uploaded objects"
+      },
+      {
+        "id": "functions",
+        "path": "${dir:functions}",
+        "class": "valuable",
+        "why": "the edge functions' code"
+      },
+      {
+        "id": "db-config",
+        "path": "${dir:db-config}",
+        "class": "rebuildable",
+        "why": "the database's configuration, seeded again"
+      }
+    ]
+  },
   "resources": [
     {
       "id": "state",