Account 


					
		
		
  * has one owner (user)
  * has many users
  * has many customers
  * has many invoices
  * has many labels

				
		

		

	
	





Invoice 





	
	

		

		

			
				
				

					
		
		
  * belongs to a customer
  * belongs to an account
  * has and belongs to many labels

				
		

		

	
	





Customer 





	
	

		

		

			
				
				

					
		
		
  * belongs to an account
  * has many invoices
  * has many and belongs to labels

				
		

		

	
	





User 





	
	

		

		

			
				
				

					
		
		
  * belongs to an account
  * might belong to an account as an owner

				
		

		

	
	





Label 





	
	

		

		

			
				
				

					
		
		
  * has and belongs to many invoices
  * has and belongs to many customers
  * Belongs to an account