Cannot enter cost per kWh to more than 2 decimal places

[bigjools]

Describe the bug

When entering a cost per kWh in the charge-cost page, I need to use 4 decimal places as my supplier charges in fractions of cents. For example, if I enter 0.1446, it responds with:
Please enter a valid value. The two nearest valid values are 0.14 and 0.15.

Expected behavior

I should be able to precisely enter my charge cost rates.

How to reproduce it (as minimally and precisely as possible):

1. Go to a charge session
2. Click on "cost" to set the cost
3. Set the drop-down to per-kwh and enter the cost to more than 2 decimal places
4. See error

Relevant entries from the logs

Screenshots

Environment

• TeslaMate version: 1.21.6
• Type of installation: Docker
• OS TeslaMate is installed on: Ubuntu
• User OS & Browser: Ubuntu / Chrome
• Others:

[bigjools]

This is possibly related to #1064

[Ed-M72]

@bigjools - Would you mind upgrading and testing with 1.22.0 please. In my testing v1.22.0 has the ability to save to 4 decimal places.

[bigjools]

Sadly not working, it still has the same error.

[bigjools]

Ok I see where the problem is - you can set this to 4 places on the geofence page, but not when you click through from the charges cost link in the Grafana dashboard.

[AkshayRao27]

When responding to #4454, I remembered that this ticket existed and wanted to ask if this is something that can be reconsidered.

Some charging providers have minute-based prices that have three decimals. These prices are valid throughout Austria, and sometimes, even in other countries. An example of such a provider is WienEnergie, the Energy Provider for the city of Vienna: