Without a persistent object cache, WordPress stores every transient as two rows in wp_options, and an expired row is deleted only when get_transient() requests that exact key or when the daily delete_expired_transients cron event runs. Plugins that write per-request or per-user keys leave hundreds of thousands of rows that are never read again, and the … Read more
An unreversed annual card fee (plus GST) gets added to the statement’s Minimum Amount Due, so paying only your actual spends leaves a shortfall that the issuer reports to the credit bureau as an overdue amount with a days-past-due (DPD) flag, and reversing the fee later in the bank’s ledger does not rewrite the DPD … Read more
rsync exits with code 23 when it completes the transfer but fails to read, write, or set attributes on one or more files, and the “(see previous errors)” suffix means the actual cause is in an earlier line of the output, not in the final summary message. Root Cause Diagnosis Code 23 is a partial-transfer … Read more
Expired transients accumulate in the wp_options table when they are never read after expiry (WordPress only deletes an expired transient on access, plus a scheduled cleanup that does not always keep up), and the resulting bloat slows the autoloaded-options query and the admin-ajax.php requests that depend on it until PHP-FPM or the proxy hits its … Read more
Playwright’s npx playwright install (or postinstall download) fails behind a corporate proxy because the browser binaries are fetched by Playwright’s own Node.js downloader from cdn.playwright.dev (with fallbacks to playwright.download.prss.microsoft.com and playwright-akamai.azureedge.net), not by npm, so npm’s proxy settings are not applied to it. The downloader only honors the HTTPS_PROXY/HTTP_PROXY environment variables, and it fails with … Read more
Root Cause Diagnosis A merchant refund is a credit transaction sent to the card account number used for the original purchase. The merchant does not select a destination, so the credit routes through the card network to the issuer, which handles it according to the account’s current status. If the account is closed, the issuer … Read more
Root Cause Diagnosis Containers do not have their own clock. They share the host kernel’s system clock (CLOCK_REALTIME), so a container cannot drift independently on a native Linux host. If container time is wrong, either the host clock is wrong (no NTP sync, or RTC and system time disagree), or the container runs inside a … Read more
Root Cause Diagnosis The kernel creates HID device nodes (/dev/hidrawN, and /dev/bus/usb/BBB/DDD for libusb access) owned by root:root with mode 0600. No default udev rule grants access to an unprivileged user for arbitrary vendor devices, so open() returns EACCES (Permission denied, Errno 13) for any process not running as root. The fix is a udev … Read more
Root Cause Diagnosis Rank Math stores the primary category as post meta (rank_math_primary_product_cat for the product_cat taxonomy), and it writes that meta only when the product edit screen is submitted with the metabox’s primary term field. The WooCommerce CSV importer, WP All Import, and other bulk tools save products through the CRUD layer (WC_Product::save()) or … Read more
Root Cause Diagnosis PyInstaller bundles Python modules and most shared libraries, but it deliberately excludes libGL.so.1 through its built-in exclude list, because that library is tied to the host’s GPU driver and graphics stack. Any bundled native module that links against it (typically cv2 from opencv-python, or Qt, pyqtgraph, vtk, Open3D, pygame/pyglet extensions) will fail … Read more