In that file I found this (name replaced):
DatabaseType=MSSQLOdbc
DatabaseConnectionString=Driver={SQL Server Native Client 11.0};Server=$servername\$instancename;Database=era_db;Trusted_Connection=yes
I do remember referencing this article, https://support.eset.com/en/kb6913-use-windows-authentication-for-connection-to-sql-server-database-in-eset-security-management-center, just after the installation was complete. There is no mention of the account. However the service account running the ESMC server does have read, write, and owner permission on the database.