Hey guys! Neat idea for a project. Have you seen Handsontable? http://handsontable.com thought maybe you'd be interested in their interface
I was thinking of writing something to combine that with PostgREST ( https://github.com/begriffs/postgrest )
I did a similar thing using ExtJS: http://timwis.com/ext-postgrest-crud/ (you may have to hit refresh a couple times - I'm new to ExtJS and there must be some ajax call that doesn't finish quickly enough sometimes)
I was building off of the pre-made components that ExtJS comes with (example: http://examples.sencha.com/extjs/6.0.0/examples/kitchensink/#cell-editing ). They're pretty slick, but you have to completely adhere to the ExtJS paradigm to use them, so handsontable started to look more appealing
handsontable is definitely something i've been looking at
i've been breaking down the components of flatsheet and making separate modules for them (and doing some substantial rewrites) over here: http://github.com/editdata
the general plan is to officially rename from flatsheet to editdata early next year, too