follow the id naming principle, children start with 2_, parents start with 1_
remove delete function of relationships, parents and children
add location history interface
set most to history, and return all data of current day by default
optimize imports
revise children and parents default id generation algorithm
add power status interface
retrieve power status from link records
handle error scenario of finding device
change parentheses of verification code
fix teacher package download links
update url length from 128 to 512
update prod_init.sql
do not attempt to connect more child after user create both child and parent
fix edit parents save button label display issue
add check in history interface
school config interface for creating and query
add no card relationship creating interface
hide card number column while no backend system
accept config item while school updating