Need suggestions for admin panel implementation

HI All,

I need to create the admin panel for my existing application where I need data manipulation from existing models(CRUD operation) , but also additional features should be support, like file conversions,S# upload and some more custom features those are not related to models. I know Active admin is on fire now but I would like to know whether it is good to go with Active admin or to implement from scratch, let me know your suggestion for this.

Also I want to know what is the better approach to build the admin interface I mean having separate application for admin with shared database or single application for normal & admin users.

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