Convert stg_metering_history to incremental OR handle nulls

[bisset-a]

Would it be possible to convert stg_metering_history to be an incremental materialisation? Noticed that Snowflake has updated these views in the past, causing us to have missing data.

Or are we able to add column
{{ dbt_utils.generate_surrogate_key(['service_type', 'entity_id', 'start_time', 'name']) }} as metering_history_key,
to this model so that nulls are handled and we can change to incremental if we please? Thank you!!!