Visualize ETL distributed intergration

Validate jobs list, load from variables and should be a list.
Prepare the database driver and import necessary libraries to the runtime environment.
ETL Job group, each item identify a specific workflow on the current DAG schedule:
Extract tasks group:
...

{
"define": [ {
"tag": "",
"extract": {
"from": {
"type": "",
"env": ""
},
"query": {
"collection": "",
"aggregate": "",
"strptime": "",
"timezone": ""
...