Single Source of Truth / Availability
Kind: tension
Record: tension:availability-single-source-of-truth
Canonical: Schema
"single-source-of-truth" (contracts-core layer) is traded against "Availability" (correctness-core layer) — a principle cannot be scope-separated from a quality, metric, or cost it competes with; resolve by measuring "Availability" and choosing an explicit operating point.
Listed in Tensions, after Canonicalization / Lossless Preservation and before Single Source of Truth / Decentralization.