proc isExistsIndex(rdb: MysqlConnections; table: Table; column: Column): Future[
    bool] {....stackTrace: false, raises: [Exception, ValueError], tags: [
    TimeEffect, RootEffect, WriteDirEffect, ReadDirEffect, ReadIOEffect,
    WriteIOEffect], forbids: [].}

proc isExistsUnique(rdb: MysqlConnections; table: Table; column: Column): Future[
    bool] {....stackTrace: false, raises: [Exception, ValueError], tags: [
    TimeEffect, RootEffect, WriteDirEffect, ReadDirEffect, ReadIOEffect,
    WriteIOEffect], forbids: [].}