This is in regards Azure accounts on the 12 months trial that come with free services.

The free services include a SQL Server Database using the DTU model in tier S0. The exact terms are stated here:

CodePudding user response：

"2.54/31 (1/Day)"

That means you've used 2.54 of the 31 free days of Azure SQL Database S0 that you get for free each month. But since S0 is a provisioned service tier, this is not a variable, usage-based meters like many of the other billing meters. More details here.