Being "Blotted Out" .....

...... of the book of the living," Psalm 69:28.

Please help me to understand what the psalmist (apparently David) was trying to tell his readers.

Was/Is there, in fact, a "book of the living"?

Is such a "book" a literal book as we mortals perceive a book to be, i.e., with bound covers and pages?

In what language is a person's name written therein?

Is this book the same as other book(s) such as is mentioned in Revelation 13, 17, and 20?

If one's name can, in fact, be blotted out of this/these book(s) "of the living," how does this harmonize with the doctrine of salvation by grace and/or "eternal security" and/or the "Preservation of the Elect" and/or "OSAS"?

When exactly was this book written?

Can there ever be any "revisions" to this book, and, if so, on what basis/bases would such "revisions" be made..... and by whom would they be made?

Please understand that the above questions are asked in all humble sincerity.

I have been asked these questions in the past, and, more than likely, will be asked in the future.

Possibly some of my fellow BB posters have been asked some (or all) of them as well.

I will look forward to reading your replies to any/all of these questions, especially those with specific Bible references.

Thank you.