Now the runtime was trying to replay every unacknowledged alarm since January simultaneously. The ghost tags were the system hallucinating past events.

Source: WinCC RTE. Event ID: 7036. "History logging: replay queue overflow. Update 1 pending."

"The server's CPU is at 95%," said Lena, the night shift operator, pointing to a diagnostic tool. "For no reason. It's like the database is stuck in a loop."

Aris sighed, pushing his glasses up his nose. The cement plant had been running on WinCC 7.0 for three years. The SP3 update had been a disaster last spring—trend archives corrupted, a six-hour outage, and the shift manager yelling about "digital termites."

The temperature curve froze entirely. Lena swore. Aris watched the server's hard drive LED blink frantically—not reading, but reorganizing . Every second felt like an hour.

Lena laughed. "You want to install something now ? The kiln is at 1500 degrees!"

At 100%, a new dialog: "Update successful. Archive replay queue cleared. 12,847 orphaned alarms deleted."