ER図に枠線をつけた
Revert b8af41d..1f99ad2

This rolls back to commit b8af41dd7329b8b002b2594939028fbb8949d1e5.
Revert 1f99ad2..5508325

This rolls back to commit 1f99ad2342abe530c851b076530773a75849eee8.