Change Details

Part of [[ https://linear.app/comm/issue/ENG-4269/implement-the-database-schema | ENG-4269 ]]. Depends on D8450.

Part of [[ https://linear.app/comm/issue/ENG-4269/implement-the-database-schema | ENG-4269 ]]. Added methods to manage holder assignments - design described in-depth in the notion doc attached to the parent linear issue Depends on D8450.

Part of [[ https://linear.app/comm/issue/ENG-4269/implement-the-database-schema | ENG-4269 ]]. Added methods to manage holder assignments - design described in-depth in the notion doc attached to the parent linear issue Depends on D8450.