She scrolled the Matrix. No mention of historian issues. That meant it was either a new problem or an undocumented one. She called an old colleague—Dominic, who now worked at a Wonderware (no, AVEVA, she corrected herself) integrator in Baton Rouge.

She smiled, knowing she’d just added her own entry to the ghost in the machine.

“The one where engineers annotate their own findings. Look at the entry for InTouch 10.1 SP3 with Historian 9.0 on NTFS volumes larger than 2TB. There’s a handwritten note—I swear it’s handwritten in the PDF—that says: ‘SQLite timestamp mismatch. Set registry key: HLM\Software\Wonderware\Historian\UseSystemTime=1.’ ”

Two: The legacy SCADA system—Wonderware InTouch 10.1—was older than some of her interns.

Three: The new edge servers she’d just unboxed ran Windows 11 IoT Enterprise.

Marta let out a breath she didn’t know she’d been holding.

She looked at the test bench. The InTouch graphics glowed steady. The tags read true. The bourbon line’s virtual mash was cooking perfectly.

The Wonderware InTouch Compatibility Matrix.