The gateway stores the text of the content uploaded.
Assuming a five-char average per word and 500 words per page, it is estimated that 1 page of content should take 5kb.
The system stores both the original text and a vector representation (chunk) of the content, which is approximately 2kb per page.
Total 7kb per page or in other words 1M can contain around 140 pages of content
Depending on how many pages of content - you can calculate the estimated size of DB needed for the