Build an application that consumes/accepts a CSV (Comma Separated Values) file of N-Rows. Each Row is comprised of:

• object_id: is a unique identifier for a specific object.
• object_type: denotes the object type.
• timestamp: needs no explanation
• object_changes: serialized json comprised of properties that changed at timestamp, and their accompanying values.

Here's an example CSV:

object_id,object_type,timestamp,object_changes
1,Order,1484730554,"{\"customer_name\":\"Jack\",\"customer_address\":\"Trade St.\",\"status\":\"unpaid\"}"
2,Order,1484730623,"{\"customer_name\":\"Sam\",\"customer_address\":\"Gecko St.\",\"status\":\"unpaid\"}"
1,Product,1484731172,"{\"name\":\"Laptop\",\"price\":2100,\"stock_levels\":29}"
1,Order,1484731481,"{\"status\":\"paid\",\"ship_date\":\"2017-01-18\",\"shipping_provider\":\"DHL\"}"
2,Product,1484731671,"{\"name\":\"Microphones\",\"price\":160,\"stock_levels\":1500}"
1,Invoice,1484731920,"{\"order_id\":7,\"product_ids\":[1,5,3],\"status\":\"unpaid\",\"total\":2500}"
1,Invoice,1484732821,"{\"status\":\"paid\"}"

after the application consumes the CSV, the user should be able to query the system for the states of objects consumed at a specific point in time. Examples:

1- What's the state of Order Id=1 At timestamp=1484733173 ? {"customer_name"=>"Jack", "customer_address"=>"Trade St.", "status"=>"paid", "ship_date"=>"2017-01-18", "shipping_provider"=>"DHL"}

2- What's the state of Order Id=1 At timestamp=1484722542 ? {} # Object Didn't Exist at that time.

3- What's the state of Order Id=1 At timestamp=1484731400 ? {"customer_name"=>"Jack", "customer_address"=>"Trade St.", "status"=>"unpaid"}

The Application Should be deployed online (choose whichever provider you like, AWS, Heroku, DigitalOcean, ..etc), and the code hosted on github.