- rename common package to database
- move all code not related to database to new helper package
- add more test in database package to improve code coverage
- add a new (own) package for AMQP client
- revise documentation for swaggo
- clean up testdata, serializers and responses
- add validators for signal endpoints
- revise signal endpoint implementations
- add validators for widgets
- revise implementation of widget endpoints
- clean up testdata, serializers and response
- improve documentation for swaggo
- clean up testdata, serializers and responses
- add validators for dashboards
- revise documentation of dashboard endpoints for swaggo
- revise endpoint implementations