Platform Data Model
Two-layer model
Section titled “Two-layer model”Stratum is intentionally split into:
- a catalog layer for metadata, access, and workflow state
- an analytical layer for wafer, die, and test-result payloads
This keeps product workflows responsive without treating every analytical query as a transactional concern.
Free tier vs server-side product
Section titled “Free tier vs server-side product”The free stdf.io path is local and browser-first.
The server-side product adds:
- account and product structure
- saved lots and snapshots
- notebooks and collaboration
- settings and overrides
- shareable, reviewable analysis artifacts
Core analytical grain
Section titled “Core analytical grain”The main analytical grains are:
- lot
- wafer
- die
- test result
Most linked analysis flows are different projections of those same grains.
Why this matters to users
Section titled “Why this matters to users”If two views disagree, the first question should be whether they are actually looking at the same:
- lot
- snapshot
- wafer scope
- selection
- scenario limits
The data model is what makes those contexts propagate coherently.
