Hi, there!
I have good experience in FaceBook API in my last projects.
#1 issue is related to your database. I guess after importing or removing issue, you save the database's record and no change. So if you are going to import and remove the same file, you can't do it without any changes in your record.
#2 issue has to check the project and your requirement.
#3 I have some experience in saas project.
As the result, I'm sure I'm the best candidate for your project.
Please ping me to discuss your project.
Thanks for reading.
John.