Bit hard to tell without some idea of the structure of the data, but my experience has been storing blobs in the database is only a good idea if those objects a

Bit hard to tell without some idea of the structure of the data, but my experience has been storing blobs in the database is only a good idea if those objects are completely self contained i.e. entire files. If you write a small program to check the integrity of your blobs i.e. that the structure of the json didn't change over time, you may be able to infer a relational table schema that isolates those bits that really need to be blobs. Too leave it too long invites long term compatibility issues if somebody changes the structure of your json objects.