Change Details

Part of [[ https://linear.app/comm/issue/ENG-4269/implement-the-database-schema | ENG-4269 ]]. Depends on D8457.

Part of [[ https://linear.app/comm/issue/ENG-4269/implement-the-database-schema | ENG-4269 ]]. Replaced HTTP handlers logic with calls to the `BlobService` class Depends on D8457.

Part of [[ https://linear.app/comm/issue/ENG-4269/implement-the-database-schema | ENG-4269 ]]. Replaced HTTP handlers logic with calls to the `BlobService` class Depends on D8457.