Loyalty · The lock-in · Element
The expiry
When the lock-in ends.
The part
What it is
Contracts expire, integrations get replaced, and a competitor eventually builds the migration tool. The date matters because it is when preference has to carry the relationship.
Customers with weak preference and lock-in expiring in the same quarter are a specific, forecastable risk.
The smallest level
The attributes it carries
Each attribute is one of the framework’s shared types. What a date is, and how it is written, is defined once for the whole model — the note here says what it means in this particular place.