What kind of integration you need?

Just authentication, or even user synchronization?

or something else?

VSCode itself has some limitations and due to this, not so easy to add an ability to show some angular page. But anyway, much more you’ll achieve if you do it as an extra extension to VSCode, instead of still using Source control classes.

Added an article about GitHub Codespaces with an ability to edit ObjectScript with running IRIS inside. With an extra option to run own browser version of VSCode anywhere in the cloud on your own conditions.

By Setting in Business Service which it will be tied to. But I think, it will be simple, like check that latest data where create date more than current plus n seconds

Looks like, that you have some data generated, which you should care about, but with some delay. So, how about creating some custom adaptor, which would look at that data, check for conditions and do the task. So, just only need an index by creation time.

Why not to place it to some GitHub repo or at least gist?

github.dev, is just a simple VSCode but in the cloud. It may get a coloring if it would allow at least our main extensions for ObjectScript, which in fact provide a basic coloring. GitHub.com itself uses coloring from another source, which in fact almost the same as for VSCode.

I'll look at github.com, and maybe I will find a solution, how to get coloring there somehow. And thinking about Codespaces feature as well.

fixed, set pool duration to unlimited, and activated it

I think this may happen, due to some issues with availability of some internal services.

In any way it’s now possible using VSCode for development with InterSystems versions 2016.2 and later. So, I would recommend using it instead. Documentation 

As I know, there is no way to have a schedule for the whole production. Just only services can have scheduled.

With working hours 8:00-18:00, will be something like this.

START:WEEK-*-01T08:00:00,STOP:WEEK-*-01T18:00:00,START:WEEK-*-02T08:00:00,STOP:WEEK-*-02T18:00:00,START:WEEK-*-03T08:00:00,STOP:WEEK-*-03T18:00:00,START:WEEK-*-04T08:00:00,STOP:WEEK-*-04T18:00:00,START:WEEK-*-05T08:00:00,STOP:WEEK-*-05T18:00:00

JSON is binary in a low level, so, the same as for $listbuild, I think only one way to go, and it is from begin to end

USER>set json = [0,1,2]                                                                                     

USER>set json = [0,1,2], iter = json.%GetIterator()

USER>while iter.%GetNext(.key, .val){ write !,"[",key,"]=",val do:key=0 json.%Remove(key) }

[0]=0
[1]=2
USER>zw json
json=[1,2]  ; <DYNAMIC ARRAY>

And even with %Remove will not reach subsequent items

Be careful with multiple %Remove, it moves the index. So, the next %Remove in a row, will remove the wrong item. 

I would not recommend using it this way, due to many limitations and issues in it. Just make it on your own.

What the issue you faced?

Class User.Rest Extends %CSP.REST
{

XData UrlMap [ XMLNamespace = "http://www.intersystems.com/urlmap" ]
{
<Routes>
<Route Url="/:resource/(.*)" Method="GET" Call="GetResource" Cors="true"/>
<Route Url="/ping" Method="GET" Call="Ping" Cors="true"/>
</Routes>
}

ClassMethod Ping() As %String
{
  Write {"pong": true}.%ToJSON()
  Return $$$OK
}

ClassMethod GetResource(pResource As %String, pId As %String) As %Status
{
  Write {"resource": (pResource), "id": (pId)}.%ToJSON()
  Return $$$OK
}

}

With this REST class, I can do queries like this http://localhost:52773/rest/patient/test/123/456, with no issues it returns {"resource":"patient","id":"test/123/456"}

Nowadays I would look to Rust, which is good replacement for C, and should as fast as C.