[FEATURE]: Allow to combine data sources

[vingerha]

Describe the solution you'd like My area is served by 5+ transport providers, each with their own gtfs source. Especially for setting up local-stops, this means that I have to do this for each of the providers individually and need to refresh each setup individually too. When I base it on my cell-phone location, the refresh/automation has to run for each setup/source. Having all required in one db-source will make that easier to maintain on the front-end side too

Describe alternatives you've considered Alternative: my use case is based on 4 sources, this may be exceptional so not sure if it is worth adding (quite a bit) complexity and instead just live with multiple automations combined in one or more cards

Proposed approach Based on HA that runs the automations

• add a service call to make one of the sources 'main' (fixed name), i.e. rename an existing source
• add a service call to add non-main source to main, each time deleting that souce afterwards
• add a service call to reset: i.e. delete selected db/source or 'anything' (if none selected)

[vingerha]

Closing as difficult to maintain with different refresh schedules of the various sources, i.e. in my use-case I would have to refresh weekly just because 1 source is refreshed weekly, others are mothly. As this is only 'my' use case so far, no further need known ...hence closing