HFI Calc: All users see same information - the basics

[Sybrand]

As a Z/RWCO I want everyone to see the same information So That there is no uncertainty and collaboration between Z/RWCOs is supported on prep morning

Additional Context

• Changes to values such as FOP and are visible to all users.
• Prep period is NOT persisted/saved - every time you go to the page, you have to select the period.
• User's won't see changes other users are making until they re-load.
• If multiple users are making changes at the same time, they may be over-writing each others changes.
• There is a follow up ticket (HFI Calc: All users see same information vs. local changes  #1634) that addresses many UX issues.

Acceptance Criteria

• Given I change a value in one of the select fields (fuel type, fire start), Then when I press the save button, the change will be persisted for all users.
• Given I check/unhcheck a station, Then when I press the save button, the change will be persisted for all users.
• Given a value in a select field has been saved, Then when I load data, I see the modified value.
• Given a station has been check/unchecked and save has been clicked, Then when I load data, I see the modified value.

Additional tasks

• Add more tests (don't have good tests to validate calculations at the moment)
• Have to address the date nightmare on the front end. Too much jumping between different date time formats!!!
• Some refactoring (moving code out of hfi router, to app.hfi module)
• Other code cleanup

Definition of Done

• Ready to Demo in Sprint Review
• Does what I have made have appropriate test coverage?
• Documentation and/or scientific documentation exists and can be found
• Peer Reviewed by 2 people on the team
• Manual testing of all PRs in Dev and Prod
• Merged

[nmathava]

Hey team! Please add your planning poker estimate with ZenHub @conbrad @JulianForeman @Sybrand