My turn to got database corruption in Daz Studio

I made a huge mistake when installing tons of Daz Studio content: I left the Daz Studio application running.  I didn't know that this was the most common reason why Daz Studio database get corrupted, but now it's too late.

The result was that no matter what I researched in Daz Studio 4.6.x, I got no result regardless of whether I serached file or database within the Content Library.  Smart Content window also showed no result.  I tried Rebuild database, but it has no effect, as I continued to get empty content.

After almost 2 hours of frustration, I did the desperate move: I upgraded the software to 4.7, but explicitly set the content folder to "C:\Users\Public\Documents\My DAZ 3D Library".  That however, did NOT solve the database and search problem.  Eventually I had to install the new CMS system PostgreSQL CMS, And then after I started the application, file search in Content Library worked.  But Smart Content windows shows nothing.  I then went into "DB Maintenance", and then select Reimport Content, and bingo, the process slowly imported a lot of data, and now I am able to search using Smart Content.