Feature/device model improvements

[thanaParis]

Improving device model to use more concise sequelize and better represent the specification:

• Model.findOrCreate and Model.upsert used instead of separate operations
• Removed Evse from unique index for component and variable attributes to reflect specification
  • OCPP 2.0.1 Part 1 - Architecture & Topology, section 4.1: "Each distinct component instance is uniquely identified by an (optional) componentInstance addressing key. When no componentInstance is provided, then the default or only instance of a component is referenced."
• Made relation between Components and Variables many-to-many to reflect specification
  • OCPP 2.0.1 Part 1 - Architecture & Topology, section 4.2: "Although many components can have associated variables that are, by their nature, specific to the component type (e.g. ConnectorType for a Connector component), there are a minimal set of standardized variables that are used to provide standardized high level event notification and state/status reporting (e.g. Problem, Active) on a global and/or selective basis, and also to report component presence, availability, etc. during the inventorying/discovery process (e.g. Available, Enabled)."
• Added default Variable & VariableAttribute assignment to component creation
  • OCPP 2.0.1 Part 1 - Architecture & Topology, section 4.2: " A Charging Station is not required to report the base variables: Present, Available and Enabled when they are readonly and set to true. When a Charging Station does not report: Present, Available and/or Enabled the Central System SHALL assume them to be readonly and set to true."
• Bugfixes:
  • tbc check in NotifyReportEvent handling moved to after db update, to prevent Pending boot status from being cleared if device model does not load correctly
  • VariableStatus.value string max length set to 4000 to match VariableAttribute.value
  • docker-compose.yml adjusted so that Directus waits for postgres to be healthy before starting, preventing Directus from crashing repeatedly on startup