ServiceMetricDeltaOutput
One metric's movement for a service.
delta is null when either side has no figure, which is not a delta of
0 — render an empty cell rather than "no change", or a service whose ARR
was never recorded reads as one that did not move.
- impactType: stringenumrequired
Impact label. 'new' is not returned yet: it needs opening balances in revenue_item_financial_snapshots, which are a post-deploy step, and until they exist 'no snapshot before the period' cannot tell a brand-new service from an untouched old one.
valuesnewchurnupselldownsellnoChange - currentType: numbernullable
Value now
- deltaType: numbernullable
current - previous; null when either side is absent
- previousType: numbernullable
Value at the period start

