• README

• Exception Handling

• Who am I?

• Thoughts On AI

Engineering

Reference

• README

• Exception Handling

• Github REST API for Gists

• Inspiring Software Architecture

• book: designing data-intensive applications

• use pandoc to produce slide from markdown

How To

• write

• give consistent good PR review

• best practices: behavioural

• best practices: documentations

• best practices: design

• best practices: software engineering

Explanation

• Process v.s. Threads

• ascii control characters

• Understanding the color escape code

• Authentication vs Authorization

• Architectures

• full development cycle

• SaaS business model

• Explain Public and Private Key Cryptography like I am 5

• Default settings can change when changing debian versions

• uniqueness of UUID4

• Thoughts On AI

Python

Reference

• regular expression character classes and atoms

• errors in Requests

• python from _decimal import Decimal

• Python Language Reminders

How To

• steps to use poetry to update dependencies

• use python-simple-history

• debug in ssh

• get file path to python source codes in iPython with ??

• get celery ran tasks

• find the dependencies of python package

• profile performance

• run black on python code in markdown, generalised to any files

• use pdb for debugging

• set timeout in Requests

• use urllib instead Requests

• enable iPython autoload

Explanation

• what is python wheel?

• fileobj vs string vs bytes

• TextChoice v.s. Enum

Db

Reference

• postgres quick reference

How To

• save query result to a file

• demo read commit transaction isolation level

Explanation

• postgres Aggregate functions are actual postgres functions

• Run ANALYSE VERBOSE; after major postgres upgrade to avoid performance issue

• Use \x auto to show better view in postgres shell

Django

Reference

• best practices

How To

• debugging/pdb for dockerised django

• use GraphiQL with django debug tool bar

• count distinct values in django orm

• print raw sql queries in django unittest

• print SQL queries using CaptureQueriesContext

• How To: Create new GraphQL Enum in backend / Change An Existing Model Charfield/Textfield To Enum

• How To: set django ManyToMany field

• How To: How to set django ManyToMany field

• print SQL queries using connection from django.db

Explanation

• Django ORM aggregation and group by

• codebase uses lot of inheritances

• django-crum doesn’t work in async environments

• react-server-component CVE-2025-66478

• David Dahan’s opinions on FastAPI v.s. Django

• django sql performance analysis using sh script

• How To: with postgres don’t use RunPython with schema changes!

Sh

How To

• env to print env vars

• resolve IP addresses in Mac

• date to convert time format

• lpr to print hardcopies

• find the size of current directory

• create, extract, list a gzipped tarball

• group by and count using sort | uniq -c | sort -h -r

• save fish termincal output to a file using less < |$cat>output.txt

Explanation

• shell builtin commands

Vim

Reference

• regular expression

• regular expression character classes and atoms

• vim9script

How To

• open errors in quickfix

• find mapping source

• find out default python

• match on the second occurrence

• print manual page in color

• extract manpage table of content

• run python in vim terminal

• registers & macros

• apply changes to lines match a pattern

• vim.eval in vim python

• regex look ahead / behind

Explanation

• terminal color scheme

• don’t use as pager or man page reader

Git

How To

• use reset soft mixed hard

• rebase with fixing conflicts by always using a branch

Explanation

• understanding git log

• checkout replaced by switch and restore

• .. vs ...

• find the first release introduced a commit git show-merge

Rg

Reference

• rg cli options

• regular expression character classes and atoms

Docker

How To

• How To: speed up by using arm docker images

Explanation

• how does docker use cache?

• why is the 137 exit code?

Aws

Reference

• AWS cli commands

• DynamoDB best practice

How To

• What is IAM?

Explanation

• how cognito login works

• Elastic Beanstalk

Terraform

Reference

• cloud native at speed with confidence

• terraform language

• terraform cli

Career

How To

• find a new job: Research Stage

• find a new job: Application Stage

• find a new job: Interview Stage

Recipe

Reference

• Menu

Personal

Reference

• things needed

• Who am I?

• minimalism

• restaurants recommendations

• Household maintenance

How To

• think about success besides money and company name

Explanation

• note about these notes