Twin state is a projection of an event log rather than a table somebody updates. That one decision is what lets a reading arriving six hours late land in the window it belongs to instead of overwriting the present.
A subscription over a filtered, sorted, limited query can return exact enter, leave, move and update deltas if the in-engine window is kept an exact prefix of the source-ordered result. Gives the cushion and keyset refill construction, its correctness argument, and the sharded case it does not yet cover.
FabriqGroveState, a versioned event and an outbox row committed in one transaction, then relayed to derived projections. States precisely what the construction guarantees and what it does not, and compares bounded divergence detection against the unbounded exposure of handler-side dual writes, analytically rather than by measurement.
FabriqGroveSupervised failure prediction assumes a labelled dataset that maintained industrial assets do not produce. Characterises four distinct sources of label corruption, and sets out three practical responses and the validation evidence each one can actually support, ordered by experience rather than by measurement.
FabriqSentinelEquipment hierarchies are trees and plants are not. Shared headers, site utilities and shared spares each break the tree, and the standard responses either duplicate nodes or misrepresent connectivity. Proposes retaining the hierarchy as one edge type inside a multi-relational graph.
FabriqWhat it costs to keep an industrial digital twin honest when observations arrive late, duplicated and out of order. Derives a per-channel reorder window from measured lateness, argues that staleness must be a value in the type rather than an absence, and states the cases where interpolation is a defect. The lateness measurements themselves are not reproduced.
FabriqGrove