That's a good question,
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I ran the query shown below against the SolarWinds database looking for columns with the name credential:
SELECT t.name AS table_name,
SCHEMA_NAME(schema_id) AS schema_name,
c.name AS column_name
FROM sys.tables AS t
INNER JOIN sys.columns c ON t.OBJECT_ID = c.OBJECT_ID
WHERE c.name LIKE '%credential%'
ORDER BY schema_name, table_name;
I did the same thing, using the word password instead. So far, none of the columns found contained the Windows credentials. Since SolarWinds does not publish schema for their database, it seems that we'll need to wait for someone very knowledgeable in the SolarWinds database to jump in. Of course, you can also open a ticket w/SolarWinds customer support instead. I wish I could have been more helpful. Best wishes.