| ID | 
				 int4 | 
				 10 | 
				  | 
				 √ | 
				 null | 
				 
				  				 
				  | 
				 
				  					 
				  | 
				 Category ID  | 
				
				 | owneruser | 
				 int4 | 
				 10 | 
				 √ | 
				  | 
				 null | 
				 
				  				 
				  | 
				 
				  
				   
					| 
						users.ID
					 | 
					
						fk_categories_owneruser C
					 | 
				    
				   					 
				  | 
				 Owner user ID (PUBLIC if owneruser=null and ownergroup=null)  | 
				
				 | ownergroup | 
				 int4 | 
				 10 | 
				 √ | 
				  | 
				 null | 
				 
				  				 
				  | 
				 
				  
				   
					| 
						groups.ID
					 | 
					
						fk_categories_ownergroup C
					 | 
				    
				   					 
				  | 
				 Owner group ID (PUBLIC if owneruser=null and ownergroup=null)  | 
				
				 | creator | 
				 int4 | 
				 10 | 
				 √ | 
				  | 
				 null | 
				 
				  				 
				  | 
				 
				  
				   
					| 
						users.ID
					 | 
					
						fk_categories_creator N
					 | 
				    
				   					 
				  | 
				 Creator user ID (defaults to authenticated user on creation)  | 
				
				 | creationdate | 
				 int8 | 
				 19 | 
				  | 
				  | 
				 date_part('epoch'::text, now()) | 
				 
				  				 
				  | 
				 
				  					 
				  | 
				 Creation date and time as a Unix time stamp (defaults to current date and time on creation)  | 
				
				 | entity | 
				 text | 
				 2147483647 | 
				  | 
				  | 
				 null | 
				 
				  				 
				  | 
				 
				  					 
				  | 
				 Canonical entity  | 
				
				 | name | 
				 text | 
				 2147483647 | 
				  | 
				  | 
				 null | 
				 
				  				 
				  | 
				 
				  					 
				  | 
				 Name  |