One of our production databases has been altered over the weekend. In particular a table containing user data has been updated across the board, altering usernames. This should not have happened and we are trying to find out when it happened and who did it.
Our regular DBA is not here and although I do SQL Server DB development I'm not sure what can be done in this situation. It seems like the database and transaction logs have only been retained for the past two days so the oldest available backup includes the unwanted changes committed.
Is there any way to find out when these updates occurred and under what credentials this happened?