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Note that the API returns tags as a simple table, meaning any modifications to it will not propagate back to the game. Thus, to modify a set of tags, the whole table needs to be written back to the respective property.

script.on_event(defines.events.on_built_entity, function(event)
	if event.entity and event.entity.name == "signal-logger" then
		local tags = event.entity.tags or {}
		tags.logger_name = tags.logger_name or ""
		tags.signals = tags.signals or {}
		event.entity.tags = tags
		game.print(event.entity.tags and "entity.tags present" or "entity.tags absent")
	end
end)

The tags associated with this entity ghost. nil if this is not an entity ghost or when the ghost has no tags.

FeelusM wrote: Sat Oct 25, 2025 11:21 pm Or I should save it in `storage.some_data[entity.unit_number]` and write boilerplate code for transferring it between `storage` and `ghost_entity.tags` for numerous events?

FeelusM wrote: Sun Oct 26, 2025 1:29 pm Where should I store data between deconstruction and cancelling deconstruction (Ctrl+Z)

• on_cancelled_deconstruction
• on_marked_for_deconstruction
• on_player_deconstructed_area
• on_pre_ghost_deconstructed

How should I set ghost_entity.tags? (On which event?…)

How to understand which real former entity corresponds to the restored ghost? (real former entity and restored ghost have different `unit_number`s)

• ghost_has_flag
• ghost_name
• ghost_localised_name
• ghost_localised_description
• ghost_type
• ghost_prototype
• ghost_unit_number