add empty logs

@@ -32,6 +32,10 @@ class ApiCache {
 
         this.memcached.items( ( err, result ) => {
             if( err ) console.error( err );
+
+            if (result.length === 0) {
+                this._log('empty items')
+            }
             // for each server... 
             result.forEach(itemSet => {
 
@@ -39,6 +43,10 @@ class ApiCache {
                     keys.pop(); // we don't need the "server" key, but the other indicate the slab id's
                 
                 var len = keys.length;
+
+                if (keys.length === 0) {
+                    this._log('empty item set');
+                }
                     
                 keys.forEach(stats => {
                     

@@ -158,7 +158,7 @@ const p = {
             projectId: pid
         }).sort({
             buildTime: -1
-        }).exec();
+        }).limit(30).exec();
         buildings.forEach(b => {
             b.updatedAt = moment(b.updatedAt).format('YYYY-MM-DD HH:mm:ss');
         });