CheckExistence possible missing values

[danieldegroot2]

Tables of some of the CheckExistence values and possible missing values, though ones at bottom have much lower frequency.
(sidenote: 'size' is some subjective value based on the function and physical appearance.)

amenity	subset	size	frequency (years)	usable	notes
(lifecycle tags)		0	❓	n/a (redundant)	covered by construction quest
parking	demolished	2	❓	-	*_parking (and *=yes), (*:)/(*_)rental(:*)=*, etc.
parking_space	demolished	1	❓	-
bench	demolished	3	6	-
place_of_worship	moved/demolished (memorials)	1	❓	-
waste_basket	moved/demolished	1	6	-
recycling	moved/demolished	2	6	-
toilets	disused/demolished	3	6		(Check frequency is sufficient to be included, check it is not too spammy)
post_box	disused/demolished	2	4	-
drinking_water	disused	2	6	-
vending_machine	disused	2	4	-
waste_disposal	moved/demolished	1	❓	-	similar to waste_basket and recycling
atm	disused	2	2	-
charging_station	small vehicles	1	❓	-
telephone	disused/replaced/demolished	3	2	-
bbq	demolished	2	4	-
public_bookcase	demolished	1	2	-
grit_bin	demolished	1	4 ( #2726 )	-
clock	disused/demolished	1	4	-
bicycle_repair_station	demolished	2	❓	-	Ref #6397 / #6398
lounger	demolished	3	6	-
ticket_validator	demolished	1	4	-	(Check frequency is sufficient to be included, check it is not too spammy)
compressed_air	demolished	2	❓	-
sanitary_dump_station	demolished	1	❓	n/a (unlikely)	similar to waste_basket and recycling
waste_dump_site	demolished	0	❓	n/a (unlikely)
smoking_area	demolished	1	❓	-	There is 'smoking-free public spaces' movement in some countries. Smoking area might be replaced by indoor/outdoor smoking area, or smoking no longer allowed anywhere.
chair	demolished	3	❓	n/a (too hard)	see also amenity=seat
photo_booth	demolished	2	❓	n/a (unlikely)
table	demolished	3	❓	-	similar to bench, see also leisure=picnic_table
polling_station	removed	1	❓	-	(multi-)yearly occurence
binoculars	demolished	2	❓	n/a (usually permanent)
mobile_library	removed	1	❓	n/a (usually website only)
give_box	demolished	1	❓	-	similar to public_bookcase and recycling
device_charging_station	demolished	1	❓	-	powerbank rental and (*:)/(*_)rental(:*)=*, etc.
nameplate	replaced/demolished	1	❓	n/a (discouraged)	see also advertising=flag, man_made=sign etc.
library_dropoff	demolished	1	❓	-	similar to public_bookcase and recycling
food_sharing	demolished	1	❓	-	similar to public_bookcase and recycling
checkpoint	demolished	0	❓	n/a (too hard)	see also barrier=border_control and amenity=security_control and checkpoint=*
bicycle_wash	demolished	3	❓	-	see also *_wash
piano	demolished	3	❓	-

emergency	subset	size	frequency (years)	usable	notes
fire_hydrant	demolished	1	❓	n/a (spammy)
defibrillator	disused/demolished	1	❓	n/a (too hard, might be indoors)	similar to life_ring. though note there is already 'Where is this defibrillator located?' quest.
life_ring	disused/demolished	1	4	-	(Check frequency is sufficient to be included, check it is not too spammy)
first_aid_kit	disused/demolished	1	❓	n/a (too hard, might be indoors)	similar to life_ring
bleed_control_kit	disused/demolished	1	❓	n/a (too hard, might be indoors)	similar to life_ring
...	...	...	...	...

highway; some POIs like bus_stop might be (temporarily) disused, moved or demolished.

barrier; some POIs might be demolished. (similar to traffic_calming)

leisure; some POIs like fitness_station might be demolished (though unlikely).

etc.