@startuml

skinparam linetype ortho

entity "records" {
	id: primary
	--
	date: varchar(10) [YYYY-MM-DD]
	start: varchar(5) [HH:MM]
	end: varchar(5) [HH:MM]

	created: timestamp
	modified: timestamp
	modified_to: records::id
}

entity "estimates" {
	id: primary
	--
	date: varchar(7) [YYYY-MM]
	estimate: real
	
	created: timestamp
	modified: timestamp
	modified_to: estimates::id
}

@enduml