Susumu Takahashi - DEV Community

Susumu Takahashi

Sep 5

Crontab syntax basics, and how it differs from WP-Cron

#wordpress #php #tutorial

2

4 min read

Susumu Takahashi

Sep 4

Organizing per-host settings with `~/.ssh/config` — a standard practice for anyone managing multiple servers

#wordpress #php #tutorial

1

4 min read

Susumu Takahashi

Sep 3

SSH key types (RSA / ED25519 / ECDSA) — what actually differs, and which one to pick

#wordpress #php #tutorial

2

4 min read

Susumu Takahashi

Sep 2

How the WordPress transient API works, and when `wp transient delete` actually helps

#wordpress #php #tutorial

2

4 min read

Susumu Takahashi

Sep 1

`wp db check` / `wp db optimize` — the database health commands that get overlooked

#wordpress #php #tutorial

2

3 min read

Susumu Takahashi

Aug 31

Using WP-CLI aliases to switch between multiple WordPress environments safely

#wordpress #php #tutorial

1

2

4 min read

Susumu Takahashi

Aug 28

Comparing pricing models across four WordPress maintenance tools — what the shape of a price reveals about cost structure

#wordpress #php #tutorial

2

4 min read

Susumu Takahashi

Aug 28

A tabbed form that silently refused to submit — required fields hidden behind another tab

#python #webdev #programming

8

10

4 min read

Susumu Takahashi

Aug 27

UTF-8 vs. cp932: Why Some Bugs Only Show Up on Japanese Windows

#python #webdev #programming

2

4 min read

Susumu Takahashi

Aug 25

Verifying a WordPress major upgrade — a 7-step post-upgrade checklist

#wordpress #php #tutorial

2

6 min read

Susumu Takahashi

Aug 24

Greedy vs. Non-Greedy Regex: Why the Same Pattern Can Match Differently

#python #webdev #programming

2

5 min read

Susumu Takahashi

Aug 23

Log Level Design and Rotation: Why Apps Use DEBUG/INFO/WARNING/ERROR

#python #webdev #programming

1

5 min read

Susumu Takahashi

Aug 22

Site list scrolls to top on every delete — fixing the missing keepScroll argument across 6 call sites

#python #webdev #programming

1

2 min read

Susumu Takahashi

Aug 21

The Principle of Least Privilege: Why File Permissions Like 600/644/755 Exist

#python #webdev #programming

1

5 min read

Susumu Takahashi

Aug 20

The excluded-plugin setting that Playwright ignored — fixing browser-mode updates and false residual warnings

#wordpress #php #tutorial

1

3 min read

Susumu Takahashi

Aug 19

The cp932 crash in the build gate that only happened on Windows — static detection, behavioral testing, and a negative check

#python #webdev #programming

1

3 min read

Susumu Takahashi

Aug 18

Placing corrections exactly where an LLM is tempted to sound plausible instead of right

#python #webdev #programming

1

3 min read

Susumu Takahashi

Aug 17

A support chatbot needs to be designed for what it won't answer, not just what it will

#python #webdev #programming

1

2 min read

Susumu Takahashi

Aug 15

The free plan wasn't actually "no registration required" — fixing a landing page claim that contradicted itself

#python #webdev #programming

2

3 min read

Susumu Takahashi

Aug 13

Resuming email verification after the app is closed — the pending_email state that prevents re-sending

#python #webdev #programming

1

4 min read

Susumu Takahashi

Aug 13

SPF, DKIM, and DMARC together — why the missing DMARC record was blocking registration emails

#python #webdev #programming

1

3 min read

Susumu Takahashi

Aug 12

When maintenance ends with an error, the plugin update badge disappears — designing a backend marker and frontend count sync

#python #webdev #programming

2

4 min read

Susumu Takahashi

Aug 10

A csh bug we thought we fixed came back in a new feature — designing a login-shell-independent SSH command wrapper

#wordpress #php #tutorial

1

4 min read

Susumu Takahashi

Aug 9

Deploying and committing to git are not the same "done" — the trap of assuming uploaded means synced

#python #webdev #programming

1

3 min read

Susumu Takahashi

Aug 7

Checking that a count didn't change — a sanity check before writing a reorder API's result

#python #webdev #programming

1

3 min read

Susumu Takahashi

Aug 5

A version bump that got left behind — fixing it with a single source of truth and a `--check` gate

#python #webdev #programming

1

4 min read

Susumu Takahashi

Aug 5

Don't show users a raw Playwright error — translating exceptions into friendly messages

#wordpress #php #tutorial

1

3 min read

Susumu Takahashi

Aug 4

When "select all" checkboxes don't actually select anything — verifying after `check()`, not just trusting it

#wordpress #php #tutorial

1

3 min read

Susumu Takahashi

Aug 3

When `update-core.php` version scraping goes wrong — telling a plugin version number apart from WordPress core

#wordpress #php #tutorial

1

3 min read

Susumu Takahashi

Jul 31

Browser-based updates getting stuck on the "Confirm your admin email" screen — why Playwright stalls in wp-admin

#wordpress #php #tutorial

1

3 min read

Susumu Takahashi

Jul 30

Why scheduled posts don't publish on time — inspecting WP-Cron with WP-CLI

#wordpress #php #tutorial

1

3 min read

Susumu Takahashi

Jul 29

Locked out of wp-admin? Why WP-CLI works when `wp-login.php` doesn’t

#wordpress #php #tutorial

1

4 min read

Susumu Takahashi

Jul 28

Why phpMyAdmin migrations break plugin settings — and why `wp search-replace` doesn’t

#wordpress #php #tutorial

1

4 min read

Susumu Takahashi

Jul 24

Getting ready for WordPress 7.0 — three things to check now: PHP requirements, FSE migration, and editor extensions

#wordpress #php #tutorial

2

5 min read

Susumu Takahashi

Jul 23

Running a WordPress major upgrade step by step with WP-CLI — commands and checkpoints for each stage

#wordpress #php #tutorial

1

6 min read

Susumu Takahashi

Jul 22

Three site-list UX improvements: instant completion feedback, error highlighting, and auto-deselect

#python #webdev #programming

1

3 min read

Susumu Takahashi

Jul 21

Why environment variables don’t suppress WP-CLI PHP Deprecated warnings — the phar + shebang path and a three-part structural fix

#python #webdev #programming

4 min read

Susumu Takahashi

Jul 18

When SSH to Xserver suddenly stops working, it's fail2ban — the official confirmation and a safer reconnection check

#wordpress #php #tutorial

3 min read

Susumu Takahashi

Jul 16

Five failure patterns from past WordPress major upgrades — what 5.0 Gutenberg through 6.0 FSE taught maintenance teams

#wordpress #php #tutorial

5 min read

Susumu Takahashi

Jul 16

Don't apply WordPress major releases on day one — the "x.0.1 rule" and a calibration framework

#wordpress #php #tutorial

4 min read

Susumu Takahashi

Jul 15

Seven things to check before a WordPress major upgrade — before "patch what breaks after" becomes a disaster

#wordpress #php #tutorial

5 min read

Susumu Takahashi

Jul 14

A variable I'd refactored into one function — and kept referencing from another. Python's lazy evaluation hid it, and an AST test finally caught it

#python #webdev #programming

5 min read

Susumu Takahashi

Jul 13

When the same selector appears twice on a WordPress admin page — Playwright strict mode and the `.first` habit

#wordpress #php #tutorial

5 min read

Susumu Takahashi

Jul 11

The day a user told me "the running site looks weak" — rebuilding the three-state visual hierarchy with background color

#python #webdev #programming

5 min read

Susumu Takahashi

Jul 10

Visualizing maintenance status on the site list — blue pulsing border for running, green solid for done

#python #webdev #programming

5 min read

Susumu Takahashi

Jul 9

Three pitfalls in a dashboard cache lifetime — boot-time restore, TTL, and partial invalidation

#python #webdev #programming

5 min read

Susumu Takahashi

Jul 8

A pending-plugin-count badge on the 🔌 button — reusing the dashboard cache instead of doubling state

#wordpress #php #tutorial

1

4 min read

Susumu Takahashi

Jul 7

A "days since last maintenance" badge — color-coding staleness across many sites

#wordpress #php #tutorial

4 min read

Susumu Takahashi

Jul 6

Detecting the running site from streaming logs — why log-order inference broke, and how one marker fixed it

#python #webdev #programming

4 min read

Susumu Takahashi

Jul 4

Quieting PHP 8.2+ deprecated noise from older WP-CLI — three layers to keep JSON parse clean

#wordpress #php #tutorial

1

5 min read

Susumu Takahashi

Jul 3

Implementing a dynamic OGP image generator for our blog — PHP GD, per-post 1200 630 cards

#python #webdev #programming

5 min read

Susumu Takahashi

Jul 3

Diff from the live server, not from your git history — when a local repo has drifted from production

#python #webdev #programming

2

4 min read

Susumu Takahashi

Jul 1

Multilingual emails from a Stripe webhook — inferring language from currency

#python #webdev #programming

4 min read

Susumu Takahashi

Jul 1

Maintaining WordPress sites behind HTTP Basic auth — Playwright, urllib, and encrypted credentials

#wordpress #php #tutorial

4 min read

Susumu Takahashi

Jun 30

When paramiko's defaults silently get your IP banned — the look_for_keys and allow_agent trap

#wordpress #php #tutorial

4 min read

Susumu Takahashi

Jun 29

Sweeping i18n leaks with four parallel AI agents — from 300 candidates down to 60 real bugs

#python #webdev #programming

4 min read

Susumu Takahashi

Jun 28

When SSH commands hit a csh login shell — wrapping every command in /bin/sh -c across the codebase

#wordpress #php #tutorial

4 min read

Susumu Takahashi

Jun 27

Building a cache-first dashboard — explicit fetch and a "closes-but-keeps-running" notice

#python #webdev #programming

4 min read

Susumu Takahashi

Jun 26

Connection architectures for WordPress maintenance tools — mapping four products on a two-axis grid

#wordpress #php #tutorial

5 min read

Susumu Takahashi

Jun 24

Hub-and-spoke SEO for comparison pages — fielding "alternative" search intent from multiple angles

#python #webdev #programming

1

3 min read

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