default to using order by desc on created_at (if no order specified)

lib/dbwrap.js

@@ -147,6 +147,10 @@ function wrap(db, dir, dbsMap) {
 
     dir.indices.forEach(normalizeColumn);
     DB._indices = dir.indices;
+    DB._indicesMap = {};
+    DB._indices.forEach(function (col) {
+      DB._indicesMap[col.name] = col;
+    });
 
     function simpleParse(row) {
       if (!row) {
@@ -251,12 +255,16 @@ function wrap(db, dir, dbsMap) {
 
       if (params) {
         if (params.orderBy) {
-          sql += " ORDER BY \"" + db.escape(snakeCase(params.orderBy) + "\" ");
+          sql += " ORDER BY \"" + db.escape(snakeCase(params.orderBy)) + "\" ";
           if (params.orderByDesc) {
-            sql += 'DESC ';
+            sql += "DESC ";
           }
+        } else if (DB._indicesMap.updated_at) {
+          sql += " ORDER BY \"updated_at\" DESC ";
+        } else if (DB._indicesMap.created_at) {
+          sql += " ORDER BY \"created_at\" DESC ";
         }
-        if (params.limit) {
+        if (isFinite(params.limit)) {
           sql += " LIMIT " + parseInt(params.limit, 10);
         }
       }