No ID on observations received from event bus

[alexrobin]

Currently, the ID is assigned when an observation is added to a database but streaming obs are obtained from the event bus BEFORE they get inserted into a DB (for latency reason).

Several possible solutions:

• Always insert the obs first before it is forwarded to even bus (would reduce streaming performance)
• Have separate module to generate IDs, independently of any database

Same applies to streaming commands.