fix: resolve discovery, plugins, and vault issues

nodejs/models/plugin_instance.js

@@ -58,6 +58,7 @@ class PluginInstance extends Model {
     lastRunAt: { type: 'integer' },
     lastStatus: { type: 'string' },
     lastError: { type: 'text' },
+    lastLog: { type: 'text' },
     // Audit stamps (set by the route handler, not by an ORM hook).
     created_by: { type: 'string' },
     created_on: { type: 'integer' },

nodejs/models/resource.js

@@ -96,11 +96,13 @@ class Resource extends Model {
       return false;
     }
     
+    let maxUpdated = 0;
     resObjs.forEach(r => {
       r.metadata.isProduction = checkProd(r.id);
+      if (r.updated_on && r.updated_on > maxUpdated) maxUpdated = r.updated_on;
     });
 
-    return { resources: resObjs, edges };
+    return { resources: resObjs, edges, updated_on: maxUpdated || Date.now() };
   }
 
   // Stamp `resolvedAddress` on each resource: its own address/ip if it has one,