Tweak postgres db memory params

[mahalakshme]

prod db performance - CPU is busy, disk is busy but we have a lot of unused RAM. We should probably do a spike to tweak postgres memory params like work_mem, shared_buffers etc for our usage (since the defaults are more suited to low resource environments)

[vinayvenu]

Current values
shared_buffers - 1GB
work_mem - 4mb. This is typically required to be increased once we go to around the 100th page of a sync.