add domain and some changes

common/docs/UsefulCommands.txt

@@ -40,3 +40,11 @@ pass: g@ll3r&15
 replacing files names/extensions:
 for f in *; do mv "$f" "`echo $f | sed s/Vehicle/Vehicle.jpg/`"; done
 
+[fixing-npm-permissions ]
+https://docs.npmjs.com/getting-started/fixing-npm-permissions
+
+[mongo commands]
+- deleting old documents: db.getCollection('[collection]').remove({"[create-timestamp-field]": { "$lte": [epoch timestamp milli]}})
+  e.g: delete every report older then 1519298608000
+  db.getCollection('reports').remove({"created": { "$lte": 1519298608000}})
+