package Ġcom . g ig aw ork s . tech . calculator . cache Ċ Ċ import Ġandroidx . room . Database Ċ import Ġandroidx . room . Room Database Ċ import Ġcom . g ig aw ork s . tech . calculator . cache . dao . History Dao Ċ import Ġcom . g ig aw ork s . tech . calculator . cache . model . History Entity Ċ Ċ @ Database ( entities Ġ= Ġ[ History Entity :: class ], Ġversion Ġ= Ġ 1 , Ġexport Schema Ġ= Ġfalse ) Ċ abstract Ġclass ĠDatabase Ġ: ĠRoom Database () Ġ{ ĊĊĠĠĠ Ġabstract Ġfun Ġhistory Dao (): ĠHistory Dao Ċ Ċ }