Method buildDeltaEntries

apps/sim/lib/logs/execution/logger.ts:1326–1354

(alreadyBilled: Map<string, number>)

      // (delta 0 at terminal) and only genuinely new usage is charged. A future
      // change that relabels historical spans would break this invariant.
      const buildDeltaEntries = (alreadyBilled: Map<string, number>) => {
        const entries: Array<{
          category: 'model' | 'fixed' | 'tool'
          source: 'workflow'
          description: string
          cost: number
          eventKey: string
          metadata?: ModelUsageMetadata | null
        }> = []
        for (const line of targets) {
          const billed = alreadyBilled.get(`${line.category}::${line.description}`) ?? 0
          const delta = line.target - billed
          if (delta <= COST_EPSILON) continue
          entries.push({
            category: line.category,
            source: 'workflow',
            description: line.description,
            cost: delta,
            eventKey: stableEventKey({
              executionId: executionId ?? '',
              category: line.category,
              description: line.description,
              billedBefore: billed.toFixed(8),
            }),
            ...(line.metadata !== undefined ? { metadata: line.metadata } : {}),
          })
        }
        return entries
      }

      if (executionId) {
        // Serialize concurrent completion boundaries for this execution so the