Hi! You only listen to on_built_entity and on_entity_died. However, you will miss entities that are placed by bots or script, or mined by the player etc. I think you should listen to the following events instead:

Build events:

• on_built_entity
• on_entity_cloned
• on_robot_built_entity
• script_raised_built
• script_raised_revive

Removal events:

• on_entity_destroyed
• on_entity_died
• on_player_mined_entity
• on_robot_mined_entity
• script_raised_destroy

Some of these may use different event data, so you can reuse your existing event handlers with slight adjustments. Here's an example from the handler for build-events in one of my mods:

  -- We use the same function for different events, so we must cover all different
  -- key names to get the entity!
  local vehicle = event.created_entity or -- on_built_entity/on_robot_built_entity
                  event.destination or    -- on_entity_cloned
                  event.entity            -- script_raised_*

Hi, Pi-C! Thank you, I've implemented the Build events for the next version. In the case of Removal events, the use-case is only if the car is actually killed by damage and leaves behind a corpse, so I think that is working as-is.

Hi, Pi-C! Thank you, I've implemented the Build events for the next version.

Thanks!

In the case of Removal events, the use-case is only if the car is actually killed by damage and leaves behind a corpse, so I think that is working as-is.

Yes, looks like it. I thought you'd need this to clean up your tables, but this seems to be taken care of by your metatables.