An Azure relational database service.
Error 40613 = the database can't be brought online; almost always Azure-side, so IP/firewall/DNS aren't the issue. At 12+ hours it's stuck or a platform incident.
You can try in order:
Resource Health (Portal then AdvoTime then Resource Health) tells you if it's a platform issue.
Manual failover - fixed an identical case:
Invoke-AzSqlDatabaseFailover -ResourceGroupName <rg> -ServerName sansoft-at -DatabaseName AdvoTime
Test master / another DB on the server - isolates DB-specific vs. server-wide.
Open support with tracing ID AA587236-93BF-4371-9507-E74259E5269D if the above fails.