Is there some way to use a static site generator with a flat file database utilising standard CRUD functionality? To me, using a static site generator and hand

Is there some way to use a static site generator with a flat file database utilising standard CRUD functionality? To me, using a static site generator and handing off database to another service like firebase or other sas, although works really well and has many benefits is still an external dependency I would rather live without. It also somewhat defeats the point of using a statit site gen for my use case anyway. This is the main thing stopping me from switching from php/mysql.