Chapter 318: Deviation

4:20 AM. The cold glow of the monitoring dashboard hadn't dimmed yet. Lin Chen dragged the raw shards of Batch_Med_20240412 into his local sandbox. The hash check passed, but the source of the timestamp deviation still had to be pinpointed. He pulled up the server migration logs from three years ago. Dragging the scrollbar down, dense lines of INFO and WARNING stretched out like a dried riverbed. He compared them line by line until the cursor halted on an anomalous entry: [2021-04-12 14:33:07] WARN: Disk I/O latency spike. Temp mount to /dev/sdb1.

That afternoon, the server room's AC outdoor unit had failed, triggering a temperature alarm that forced automatic throttling. To keep the ongoing data cleaning task running, he had manually severed the write queues for non-core nodes and temporarily mounted the medical data shards onto a backup drive. The mount command executed 0.003 seconds slower than the standard protocol. It wasn't data corruption; it was physical latency. A read/write stutter from an aging mechanical hard drive under low-temperature throttling. He opened his incident log notebook, flipped to a blank page, and wrote: Root Cause of Deviation: Hardware throttling triggered by server room temperature control failure. Manual mounting of backup storage caused clock synchronization delay. Not data contamination; classified as historical environmental fault-tolerance record. The pen tip paused. He added a line: Appendix: Serial number of the backup drive from that year, screenshot of the migration work order, temperature alarm threshold.

9:00 AM. Lights flickered on across the office one by one. The clatter of keyboards, the roll of chair casters, and the hiss of the coffee machine extracting espresso gradually filled the space. Su Man walked over with two Americanos, placing one beside him. "Engineer Li is pushing for it. For the 2 PM alignment meeting, the post-investment team is bringing an external data compliance consultant." Lin Chen unscrewed his thermos and took a sip of warm water. "The consultant is looking at processes, not code. Compile the migration logs, throttling alarm records, and manual intervention approval forms into a binder. Arrange them chronologically. One page, one fact." Su Man nodded. "Should I align our talking points with Legal beforehand?" "No need," Lin Chen said. "No beating around the bush. Answer exactly what's asked. The deviation is a fact, but a fact isn't a flaw. Lay out the fault-tolerance strategy from back then clearly, and attach the archival process we implemented afterward." Su Man glanced at him, asked nothing more, and turned to pull up the meeting checklist.

11:30 AM. The front desk signed for an SF Express cold-chain box. Lin Chen walked over and tore it open. The dry ice hadn't fully sublimated; white vapor seeped along the cardboard edges, carrying a biting chill. Inside were two boxes of sodium valproate extended-release tablets. The temperature control label showed a steady 2–8°C throughout transit, the curve flat. He took photos, scanned them into inventory, and sent a confirmation receipt back to the county hospital's pharmacy department. His phone screen lit up with a voice message from his mother, Wang Guiying. He tapped play. In the background came the rustle of Xiaoman turning picture book pages, along with the ticking of an old wall clock. "Got the medicine. Xiaoman said he didn't have any cramps today and slept soundly. You're busy over there, don't keep staying up late. Does your foot still hurt?" Lin Chen held down the voice button, keeping his voice low. "Mom, make sure he takes it on schedule. I'm wrapping up here soon. I'll come back this weekend." He hung up. He placed the medicine boxes in the bottom drawer, next to a pair of old running shoes with worn-down soles. The old injury in his left ankle throbbed faintly in the AC's cold draft. He stood up, paced twice around his workstation, slowly shifting his weight to his right foot, then back to his left. The pain was dull, like an old thread buried in the flesh—not sharp, but tugging at the nerves. He sat back down and continued parsing the logs.

1:00 PM. The conference room whiteboard was covered in timelines and version nodes. Lin Chen spread the printed compliance materials across the table. Su Man double-checked the table of contents. "Engineer Li brought two people. One's looking at architecture, the other at data flow. The consultant might ask about cross-validation for clinical annotation." Lin Chen flipped to the third page. "The annotation team is a group of retired physicians from the provincial hospital. Every medical record undergoes double-blind review, with a disagreement rate kept under two percent. During raw data cleaning, we stripped out unstructured noise but preserved all original fields with physician annotations. If the audit wants to see it, we'll give them the full desensitized sample set." Su Man jotted it down: "If we can't win a price war, we compete on transparency." Lin Chen didn't respond. He stared at the Batch_Med_20240412 node on the whiteboard. The ninety-day countdown wasn't about who could hide things best; it was about who could withstand scrutiny. Capital wanted certainty, not perfection.

2:00 PM sharp. Engineer Li pushed the door open right on time. Behind him followed a consultant in glasses and a young man clutching a laptop. The pleasantries were brief. Li cut straight to the point: "Director Lin, the timestamp deviation caught by the probes requires a technical explanation. Additionally, did the weight adjustments to the medical data ever impact the model's recall rate in vertical scenarios?" Lin Chen slid the materials over. "The deviation stems from a hardware-level clock delay caused by the server room's temperature control failure three years ago. Here are the migration work order and throttling alarm records from that time. The data itself was never compromised. The weight adjustments were based on secondary verification by the annotating physicians, part of normal iteration. Recall rate fluctuations stayed within 0.5%, smoothed out via A/B testing." The consultant pushed up his glasses, flipping through the work order. "The manual intervention didn't go through the automated approval workflow?" "It was an emergency disaster recovery measure," Lin Chen said, his tone steady. "The system logs have a complete record. We supplemented the archival process afterward. Every operation is traceable." Li said nothing, his fingers tapping lightly twice on the table. The young man typed rapidly. The only sounds in the room were the rustling of paper and the clacking of keys. Afternoon sunlight slanted through the window, falling on the chalk dust of the whiteboard, suspended particles slowly churning in the beam of light.

3:40 PM. The meeting ended. Li gathered the materials, leaving a parting remark before heading out: "The post-investment team will issue a preliminary assessment. Next Monday afternoon, President Zhao will personally hear the report." The door closed. The office fell quiet again. Su Man exhaled in relief, but her brow remained furrowed. "They didn't find any faults, but they didn't soften either. Zhao Qiming wanting to hear it himself means they're still pressing down on the valuation." Lin Chen wiped the whiteboard clean. Chalk dust settled on his cuffs; he didn't mind. "Normal. Capital isn't in a rush to pay out; they're waiting for us to show weakness." He returned to his desk and opened his incident log notebook. On a fresh page, he wrote just one line: Audit passed. Deviation classified as historical disaster recovery record. Next step: Prepare presentation materials for Zhao Qiming. Core focus: Unit inference cost and clinical scenario delivery rate.

The pen tip had barely lifted when a new message popped up on Enterprise WeChat. Sender: Engineer Li. Attachment: a PDF titled Supplementary Due Diligence Checklist: Clinical Efficacy Validation Report for Medical Vertical Model (Requires Third-Party Institution Seal). Lin Chen opened it. The final line of the checklist was bolded and highlighted in red: Please submit by 18:00 this Friday. Failure to do so will be deemed as raising doubts regarding data compliance. He stared at the line. Friday. Three days. A third-party clinical validation report, going through the ethics committee of a Grade-A tertiary hospital and external institutional procedures, would take at least two weeks at the fastest. The third page of the ledger hadn't even been turned, yet the wind was already blowing in. He closed the PDF, pulled up the contact list for the head of the provincial hospital's annotation team. His finger hovered over the call button, paused for two seconds, and pressed down.