Created question in FIWARE Q/A platform on 22-02-2022 at 09:02
Please, ANSWER this question AT https://stackoverflow.com/questions/71218728/how-to-create-different-record-for-every-update-in-fiware-draco

Question:
How to create different record for every update in FIWARE-Draco?

Description:
I just started using FIWARE and I'm having trouble with the data I want to persist on MongoDB using Draco. I am using a Python script that creates my context data with a specific id (by a POST request to Orion) and then updates certain attributes of this data (by a PATCH request to update multiple attributes) by using FIWARE Orion Context Broker.
While I can't see any problem when I observe the JSON data from this script, HTTP requests and Apache NiFi flow, MongoDB keeps only the last updated version of this data in the related collection. Because of this, I cannot perform time series functions. However I can see the "creDate" and "modDate" metadatas in attributes. But I need different records for every update to receive them.
Here is te subscription request body from Postman Client. fiware-service and fiware-servicepath headers are also included in my requests:
{
"description": "Notify Draco of all context changes",
"subject": {
"entities": [

{ "idPattern": ".*" }

]
},
"notification": {
"http":

{ "url": "http://hostIP:5050/v2/notify" }

},
"throttling": 5
}

Here is what I get in MongoDB collection, attrNames has been made dummy for the question:
{
"_id":

{ "id": "urn:ngsi-ld:entitiy:001", "type": "Log", "servicePath": "/" }

,
"attrNames": [
"a",
"b",
"c",
"d",
"e",
"f",
"g",
"h",
"i",
"j"
],
"attrs": {
"a":

{ "type": "Datetime", "creDate": 1645514416, "modDate": 1645514416, "value": "17/09/2021", "mdNames": [] }

,
"b":

{ "value": "12:00:21.0", "type": "Datetime", "mdNames": [], "creDate": 1645514416, "modDate": 1645514597 }

,
"c":

{ "value": 666.47, "type": "Integer", "mdNames": [], "creDate": 1645514416, "modDate": 1645514640 }

,
"d":

{ "value": 175.55, "type": "Integer", "mdNames": [], "creDate": 1645514416, "modDate": 1645514597 }

,
"e":

{ "value": 24.27, "type": "Integer", "mdNames": [], "creDate": 1645514416, "modDate": 1645514597 }

,
"f":

{ "value": 999.28, "type": "Integer", "mdNames": [], "creDate": 1645514416, "modDate": 1645514597 }

,
"g":

{ "type": "Integer", "creDate": 1645514416, "modDate": 1645514416, "value": 85.87, "mdNames": [] }

,
"h":

{ "type": "Integer", "creDate": 1645514416, "modDate": 1645514416, "value": -0.01, "mdNames": [] }

,
"i":

{ "type": "Integer", "creDate": 1645514416, "modDate": 1645514416, "value": 37.41, "mdNames": [] }

,
"j":

{ "value": 1111.47, "type": "Integer", "mdNames": [], "creDate": 1645514416, "modDate": 1645514640 }

},
"creDate": 1645514416,
"modDate": 1645514640,
"lastCorrelator": "679e1cba-93b0-11ec-be0f-0242ac120102"

I've gone through all the docs but either couldn't find the solution or am I missing something in the architectural logic. How should I go about the issue?
Thanks!