Chapter 227: Audit Logs

7:10 a.m.

When the access card opened the door to the provincial hospital's Information Department server room, it gave a soft beep. The voice-activated lights in the corridor did not come on. Only the cold blue glow of cabinet indicators cast a regular grid across the wall. Lin Chen set his backpack on the anti-static floor. As his left foot touched down, numbness climbed from his ankle upward, as if it had been wrapped in a layer of soaked, heavy cotton. He did not rub it. He only adjusted his balance, shifting the load on his right leg half an inch toward the outside of the sole.

The server room held steady at twenty-two degrees Celsius. He took off his coat, leaving only a faded gray long-sleeved shirt. He opened his laptop and plugged in the network cable. The IP range for the internal proxy had already been configured. Using the network topology diagram he had printed the night before, he checked the VLAN divisions one by one. The regulatory platform's audit interface ran on an independent gigabit link, directly connected to the Provincial Health Commission's log collection server. That meant every query in the system, every memory allocation, even every abnormal retry, would be recorded and uploaded in real time. There was no gray zone for "local debugging," and no buffer of "get it running first, optimize later."

He inserted a USB drive and mounted the offline rollback package. The script's underlying logic had been stripped of every nonessential module. Heartbeat checks had been changed to local disk writes, and telemetry probes had been completely disabled. He typed the final configuration command and hit Enter. A green OK appeared in the terminal. He glanced at the time: 7:42. Seventy-eight minutes remained until nine. In that span, he had to finish mounting the data sources, validating permissions, and running three simulated stress tests.

At 8:20, Engineer Wang from Information pushed the door open, thermos in hand, eyelids slightly swollen.

"Engineer Lin, you're early." Wang set the cup on a cabinet and leaned closer to the screen. "The president and Director Li from neurosurgery will be here at nine sharp. The data source is on the PACS server. I sent you the path. The format is DICOM with a private encapsulation; the headers are mixed with vendor identifiers from old equipment. Can your parser handle that?"

"It can." Lin Chen did not look up. His fingers moved quickly over the keyboard, calling up the data preview window. "Redundant header fields are already filtered with regular expressions. If an unrecognized identifier appears, it will be skipped and logged. It won't block the main flow."

Wang nodded and asked no more questions. A hospital's Information Department did not care about technical details; it cared only that nothing went wrong. He pulled over a chair and sat down to scroll through his phone. In the server room there remained only the low hum of the fans and the occasional tap of keys. Lin Chen's left foot began to swell faintly. Every ten minutes he stood to move his ankle, slowly shifting his center of gravity between both legs. The pain was dull but distinct. He treated it like a parameter to monitor—neither resisting it nor magnifying it.

At 8:50, footsteps sounded in the corridor. The strike of leather heels on terrazzo drew closer: the hospital president, the neurosurgery director, the Information Department director, and Su Man. Su Man wore a sharply tailored dark suit and carried a folder. When she saw Lin Chen, her eyes paused for one second on his pale face before moving away. She turned to the president.

"Leader, this is Engineer Lin from our team, responsible for the low-level adaptation. The parser has passed three rounds of stress testing. Today we'll be running real, desensitized cases."

The president said nothing, only nodded. Director Li from neurosurgery walked to the main console and laid a paper medical record on the desk.

"These are three complex cerebral vascular malformation cases admitted last week. The imaging data includes motion artifacts, and the slice thicknesses are uneven. If your system can delineate the lesion boundaries, then it has clinical value. Don't give us a showpiece. What we need is clean data that can go straight into surgical planning software."

Lin Chen stood. His left foot pressed against the floor; the pain was sluggish but present. He took a deep breath and pressed Enter.

The progress bar on the screen began to advance slowly. Lines of logs rolled through the terminal: [INFO] Loading DICOM sequence... [INFO] Filtering vendor identifiers... [INFO] Motion artifact correction algorithm started...

The server room was very quiet. Lin Chen watched the monitoring panel. CPU usage held steady at 42%, and the memory curve remained smooth. The regulatory platform's audit log interface was connected; the number of bytes reported in real time ticked upward in the upper-right corner. He knew that at that moment, another system in the Provincial Health Commission's backend was synchronously capturing the same data. Any memory leak or deadlock would directly trigger a red alert.

The first data set finished parsing. Time elapsed: one minute, fourteen seconds. The three-dimensional reconstruction of the lesion unfolded on the secondary screen, its edges clear, the artifacts effectively suppressed. Director Li leaned closer, his brow easing slightly.

"The slice-thickness differences are handled well. The artifacts didn't cut away the vessel wall."

Lin Chen did not answer. His fingers hovered above the keyboard, ready to load the second case.

The second data set was larger. When the progress bar reached 68%, the memory curve on the monitoring panel suddenly jumped by one notch. Lin Chen's pupils tightened. It was not a leak; it was garbage collection backing up. The raw data contained misaligned pixel blocks, and while the parser attempted interpolation, temporary caches were being generated. If the buildup continued, an OOM would be triggered in three minutes.

He did not panic. His fingers switched rapidly to the backup terminal and entered the preset degradation command: [CMD] Enable streaming block processing. Lower cache threshold to 70%.

The memory curve dropped at once. The progress bar continued forward. A yellow warning appeared in the audit log: [WARN] Streaming degradation triggered. Performance loss 12%.

Standing nearby, Su Man unconsciously tightened her grip on the edge of the folder. She knew what that warning meant. In the eyes of regulators, a yellow warning was a defect.

Director Li did not look at the logs, only at the reconstruction.

"As long as it produces results. Clinicians don't look at the process."

The third data set loaded. The progress bar ran smoothly to the end. Time elapsed: two minutes, three seconds. All three data sets had been parsed, generating STL files that met the surgical planning software standard. The system packaged them automatically and pushed them to the hospital's internal test terminal.

The president looked at his watch. 9:47. He turned to the Information Department director.

"The data is clean, and the process is compliant. It can enter the next stage of evaluation. Engineer Lin, your system's stability is good."

Lin Chen gave a slight nod.

"Thank you, Leader." His voice was a little dry. He closed the monitoring panel and began clearing temporary files. His left foot had completely lost sensation; he could only rely on his right leg for support as he slowly sat down.

Su Man came over and handed him a bottle of warm water.

"The advance payment will arrive this afternoon. The hospital will go through its internal procurement process, but you'll need to provide Level 3 classified protection certification and a complete audit compliance report. Engineer Wang from Information will send you the template this afternoon."

Lin Chen took the water, twisted it open, and drank. The warm water slid down his throat, pressing down the spasm in his stomach.

"Send me the template. I'll have the report out in three days."

After the president and the others left, only he and Wang remained in the server room. Wang packed up his things and, before leaving, patted him on the shoulder.

"Young man, solid technical skills are a good thing. But in a place like a hospital, compliance matters more than technology. That audit log system of yours has already been filed with the Health Commission. From now on, every update has to be reported in advance. Taking projects as an individual won't work."

The door closed. Lin Chen leaned back in his chair and shut his eyes. The ringing in his ears was faint, like a distant tide. He took out his phone; the screen lit up. Old Zhao's text had finally arrived:

"I saw the demonstration results. Hospital recognition means the product has clinical value. But the advance payment can only be 30% for now. The remaining 70% will wait until you obtain the medical device software registration certificate. Also, I reviewed the exclusive agreement Su Man proposed. It can be signed, but your company entity needs to be changed. Personal nominee holding won't work. Hospital procurement only recognizes corporate accounts and legal-person qualifications."

Lin Chen stared at those lines.

Company entity change. Legal-person qualifications. Medical device registration certificate.

He slowly sat upright. From his backpack he pulled out his notebook of mistakes and turned to a new page. The pen tip touched down, ink spreading into the paper.

"Article 227: Clinical acceptance passed, but the compliance threshold has risen. An individual identity cannot carry hospital procurement. Getting the technology running is only the first step; qualifications, entity status, and cash flow are the next wall. Next steps: register a company, apply for software copyright, connect with a third-party testing institution. The capital chain must cover the registration cycle. The zero-tolerance demonstration is over. The game of rules has only begun."

He closed the notebook and packed his computer into his backpack. When he stood, his left foot remained numb, but his back was straight. He pushed open the server room door and walked into the corridor. Outside the window, sunlight had fully spread across the hospital lobby's glass curtain wall, refracting into a dazzling glare.

His phone vibrated again. Su Man had sent a voice message. In the background were wind and traffic.

"Lin Chen, I just left the hospital. I've asked Legal to prepare the materials for company registration. But there's a problem. Medical device software registration requires clinical ethics approval and a third-party test report. The cycle will be at least six months. Old Zhao's advance payment won't support cash flow for half a year. What are you planning to do?"

Lin Chen stopped. People came and went through the corridor: family members pushing wheelchairs, patients holding lab slips, nurses hurrying by. The noise wrapped around him, but he heard clearly.

He pressed the voice button, his tone calm.

"Find a testing institution that can take urgent orders. Use today's desensitized hospital data for predictive testing. We can't wait for the registration certificate, but clinical demand can wait. We'll first obtain trial approval and run through a closed payment loop. As for the money, I'll break it down."

He sent the message, put away his phone, and kept walking. His left foot still hurt when it landed, but his steps did not falter. He knew that from this moment on, he was no longer merely someone who wrote code. He had to learn how to build a bridge through the cracks in the rules.