package Ġcom . fs ck . k 9 m _ m . storage Ċ Ċ import Ġcom . fs ck . k 9 m _ m . mail store . Lock able Database Ċ import Ġcom . fs ck . k 9 m _ m . mail store . Migrations Helper Ċ import Ġcom . fs ck . k 9 m _ m . mail store . Schema Definition Factory Ċ Ċ class ĠK 9 Schema Definition Factory Ġ: ĠSchema Definition Factory Ġ{ ĊĠĠĠ Ġoverride Ġval Ġdatabase Version Ġ= ĠStore Schema Definition . DB _ VERSION ĊĊĠĠĠ Ġoverride Ġfun Ġcreate Schema Definition ( migrations Helper : ĠM igrations Helper ): ĠLock able Database . Schema Definition Ġ{ ĊĠĠĠĠĠĠĠ Ġreturn ĠStore Schema Definition ( migrations Helper ) ĊĠĠĠ Ġ} Ċ } Ċ