Adding suppliers showing integration with S/4

[danjoa]

No description provided.

[chgeo]

Cool to see David's DKOM code and spaceflight coming back.

That's still quite something to digest and deserves a lot of explaining, e.g how to juggle the different launch scenarios and processes . Need to explain that in the consumption guide.

[danjoa]

Still work in progress ... :)
Partly because it uses some convenient shortcuts we just added to be published with upcoming release, like this one:

class DatabaseService {
  ...
  /** Convenience shortcut to check whether an entity instance exists */
  async exists (entity,key) {
     return this.run (SELECT(1).from(entity,key))
  }
}

Rationale for that one: I'm afraid many would just do something like this:

let exists = db.read('Books',201)
if (exists) ...

But this would do a SELECT * which might read tens or hundreds of element data unnecessarily

[CLAassistant]

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