STA Version 2 Implementation Plan

Implement the V2 data model (mostly done)
- Validate the prototype against the spec
- Add requirements classes
Implement the V2 API
- Implement Endpoint URL /v2.0
- Implement new Functions: https://hylkevds.github.io/23-019/23-019.html#query_functions
  - interval()
  - cast()
  - any
- Landing page
  - Supported functions
  - MQTT bindings
  - HTTP bindings
- MQTT Request-Response bindings
  - Upgrade Moquette to latest version for MQTT5 support
  - Create request processor
    - Per-client queue
    - Configurable per-client max parallel requests
    - Configurable total max parallel requests
  - Check Handling of maximum message size
- MQTT Subscribe bindings
- Conversion of v1.1 database to v2.0
  - Create new tables in an empty schema
    - Using normal procedure
  - Copy data using a (background) script
    - Triggered from the database status page (or a new page?)
      - Show active processes on this page
      - Show progress log messages
      - If no lock, button for starting process
    - Create a table for status messages and locking
    - Procedure:
      - Copy sequence values
      - Datastream sequence from DS + MDS
        
        Allow +X value
      - Copy Things, Locations, Sensors, ObservedProperties
      - Copy Features
      - Copy Datastreams
        
        If Obs all use the same Feature, link Feature to DS.
        
        Generate resultType from observationType and ObservedProperty
      - Copy MultiDatastreams to Datastreams
        
        Generate resultType from multiObservationTypes and ObservedProperties
      - Copy Observations in batches of 10k, per DS / MDS
        
        If all Obs of a DS have the same Feature, don't link Feature
- Expose a v1.1 end-point on a v2.0 database
  - Figure out how to translate Datastreams
    - Links to Feature
    - Generate observationType

hylkevds/STA Version 2 Implementation Plan.md