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Merge branch 'master' of github.com:hxx/yiyuan
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create model Client
create model Department
create model Product
create model City
create model Area
create model Hospital
table for many to many association between areas and hospitals
associations among models
enable to generate Entity-Relation diagram
save generated erd file
create model ServiceLog
create model Order
associations among models
update entity-association diagram
add description and price fields to Product
create model User
create model Carer and inheritance from User