Firebase observe with type .childAdded retrieves all my information every time. Please assist

Question

According to Firebase docs:

ChildAdded is triggered once for each existing child and then again every time a new child is added to the specified path

Answer 1

A few ways to do this:

• Use ref.queryLimitedToLast(1) when you start. See Firebase, only get new children.
• keep track of the most recent key you've got in your local storage and then query with queryOrderByKey().queryStartingAtValue(latestKey)
• Add a timestamp to the items and then queryOrderByChild("timestamp").queryStartingAt(now) for items with timestamp >= now. See how to discard initial data in a Firebase DB