Seaquel
SQL Server error code

SQL Server error 945

SQL Server raises error 945 at severity 16, which marks a problem with the query or data that you can correct.

Database '%.*ls' cannot be opened due to inaccessible files or insufficient memory or disk space. See the SQL Server errorlog for details.
Msg945
NameDB_IS_SHUTDOWN
Severity16
Group0–999

What it means

The database could not be accessed because files or other resources are missing.

Source: Database Engine events and errors