You have (or will before releasing) properly split this db, i.e. each user will have their own front end (fe) that is linked to the back end (be) tables? Or were you planning on something else? I'm thinking no if you have to ask about data being affected by updates.
While there are probably several ways to manage this process, what would be common to all of them is that the only thing that might be occasionally updated is the fe, due to a new query, form or report, for example. We need to know what your plan is re: splitting.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.