Reduce startup time of service

[Joelius300]

reduce startup time of service (takes >10s to import all libraries and then ~1s to fetch everything, calculate the forecast, and write it to the db). Could analyze what modules are loaded after all the imports in main.py. See if TYPE_CHECKING helps in modules that import a lot just for typing.

Ps. similarly, the cli stuff should wait with heavy imports until the cli params are validated