Store signin data in DB and use random codes

dev.fish

@@ -3,9 +3,6 @@ set oldsum (cat (find . \( -name '*.rb' -o -name '*.js' \) | sort) | md5sum)
 if not test -e infinsweeper.db
   sqlite3 infinsweeper.db < schema.sql
 end
-if not test -e db.json
-  echo "{\"account_num\":0,\"pass_num\":0,\"signed_in_users\":{}}" > db.json
-end
 pkill ruby
 ruby main.rb -p8080 &
 echo "" > $pipe_path