Additional routes

Description

Currently there aren't any routes to receive a single entity.

For a simpler data retrieving in frontends (current use case) this would be great.

Proposal

New routes:

• /Datasources({datasource_id})
• /Things({thing_id})
• /Datastream({datastream_id})
• /Observations({observation_id})

The payload would be the same as already defined by the schema.

Update

We did some exploration on our tsmdl-api instance and found out that the aforementioned routes aren't really possible to implement, due to the fact that each datasource is an own db schema.

Nevertheless, routes to get a single entity are needed. Here is a solution which worked for us:

• GET /Datasources(datasource_id)
• GET /Datasources(datasource_id)/Things(thing_id)
• GET /Datasources(datasource_id)/Things(thing_id)/Datastreams(datastream_id)