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danwald
@danwald.bsky.social
6 followers 6 following 16 posts
https://blog.danwald.me
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danwald.bsky.social
5 Event-Driven Architecture Pitfalls to Avoid

blog.danwald.me/5-event-driv...

#architecture #event
5 Event-Driven Architecture Pitfalls to Avoid
I needed to understand the gotchas in event-driven architecture before migrating more services. Wix's engineering team documented 5 painful lessons learned from moving over 2300 microservices from request-reply to event-driven patterns. The Pitfalls ...
blog.danwald.me
December 4, 2025 at 3:47 AM
danwald.bsky.social
1+N querys
blog.danwald.me/1n-querys?re...

#django #queryoptimization
1+N querys
Widely know as N+plus one problem, it’s actually a misnomer. As @adamj.eu’s article neatly summarize with examples (and now my dyslexic mind actually understands it), it’s one query to get a list of N objects that you iterate over. And each iteration...
blog.danwald.me
November 17, 2025 at 3:36 AM
danwald.bsky.social
Alembic disables my logs
blog.danwald.me/alembic-disa... #python #logging #sql
Alembic disables my logs
…and how to get them back Alembic is SQLAlchemy's database migration framework—think change management for your relational database. It autogenerates scripts tracking your ORM model changes, letting you recreate your data model at any point in time. ...
blog.danwald.me
October 12, 2025 at 3:34 PM
danwald.bsky.social
DDD: Summary
blog.danwald.me/ddd-summary?...
DDD: Summary
Here is a summary / cliff’s notes of the Domain Driven Design Quickly eBook Domain is what you trying to encode for which is owned by domain experts/specialist of the area The domain model is an abstraction represents the domain you’re trying to ca...
blog.danwald.me
September 29, 2025 at 6:28 PM
danwald.bsky.social
Moving #Git history

blog.danwald.me/moving-git-h...
Moving Git history
I needed to move some files between two repositories. I could have just copied the files over but I wanted to maintain the commit history. Enter the git-filter-repo utility that’s based on the native git-filter-branch command. It does a lot of things...
blog.danwald.me
August 5, 2025 at 10:59 AM
danwald.bsky.social
Typing
blog.danwald.me/typing?ref=t...
Typing
We type almost every day. So going with xkcd’s “is it worth your time?”, it’s definitely is! The effort you put in will compound and will leave you more time. Given the improvements with AI text generation, it might seem like a fools errand. There a...
blog.danwald.me
July 27, 2025 at 9:43 AM
danwald.bsky.social
Nested ModuleNotFound
blog.danwald.me/nested-modul...
#python
Nested ModuleNotFound
sys.path is a list of directories (or zip archives) to find imports. “The first entry in the module search path is the directory that contains the input script … Otherwise it’s the current directory”* With the following project layout: |- main.py #fr...
blog.danwald.me
July 12, 2025 at 12:38 PM
danwald.bsky.social
Forking dangerous
blog.danwald.me/forking-dang... #python #process #fork
Forking dangerous
TL;DR Python 3.14+ now duplicates processes with spawn over fork spawn duplicates the whole process space fork clones the process but doesn’t duplicate the thread space The following deadlocks (on linux, <py3.14) import threading import time fro...
blog.danwald.me
June 22, 2025 at 3:17 PM
danwald.bsky.social
Publish to pypi via UV & Github workflows
blog.danwald.me/publish-to-p... via @andrlik.org

#python #uv #publish
Publish to pypi via UV & Github workflows
I’ve incorporated uv into my development workflow. It’s a swiss army knife that replaces venv, pip, pipx, build, twine and others that i’m yet to discover. You can even run standalone scripts: uv run https://danwald.me/assets/uv_cowsay.py I wanted to...
blog.danwald.me
May 20, 2025 at 5:18 PM
danwald.bsky.social
When to use __call__
blog.danwald.me/when-to-use-...
#oauth #python #requests
When to use __call__
Requests request.get(url, auth: AuthBase=obj, **kwargs) accepts a obj: requests.auth.AuthBase to attach a user’s credentials required for a custom authentication flow. It mutate's the request object to generate an “Authorization” Header using the c...
blog.danwald.me
May 15, 2025 at 5:30 PM
danwald.bsky.social
Principles of adult behavior
blog.danwald.me/principles-o... #LifeLessons
Principles of adult behavior
I came across an old mailing list thread by John Perry Barlow from 1977 before the internet is what it is today. These were good rules to live by back then and hold true now. PRINCIPLES OF ADULT BEHAVIOR Be patient. No matter what. Don't badmouth: ...
blog.danwald.me
April 27, 2025 at 10:06 AM
danwald.bsky.social
Becoming a good story teller

blog.danwald.me/becoming-a-g... #cliffsnotes
Becoming a good story teller
I came across this great article on How to tell great stories by https://x.com/julian. I encourage you to read it. The following are the main take aways (#cliffsnotes): Be prepared, writing it out if necessary Don’t memorize which makes you talk at...
blog.danwald.me
April 22, 2025 at 3:59 PM
danwald.bsky.social
Replica Lag
blog.danwald.me/replica-lag?...

#database #replica #python #django
Replica Lag
Websites are inherently read heavy. There are various technologies that help to serve content from CDNs to application level caching. Databases can also be configured with read only replicas. Read queries can routed to these servers alleviating the l...
blog.danwald.me
March 5, 2025 at 3:34 AM
danwald.bsky.social
Dependent breaking pytest's

blog.danwald.me/dependent-br...

#python #pytest
Dependent breaking pytest's
New unit-tests were added that were passing when run in isolation. They were breaking when run all together by the CI/CD pipeline. Previous tests were affecting ours. The question was which ones? We thought it could be a data issue with persistent da...
blog.danwald.me
January 21, 2025 at 1:24 AM
danwald.bsky.social
Foreign Key with missing indexes
blog.danwald.me/foreign-key-... #mysql #constraints
Foreign Key with missing indexes
Relational databases have references to other tables via 1-Many relationships using a foreign key. CREATE TABLE Bar( id int NOT NULL, name varchar(128), PRIMARY KEY (id) ); CREATE TABLE Foo ( id int NOT NULL,...
blog.danwald.me
December 24, 2024 at 2:39 AM
danwald.bsky.social
DevX: Time to merge

blog.danwald.me/devx-time-to...

#git #python #developer #experience
DevX: Time to merge
There are several frameworks available to help understand and improve Developer eXperience at organizations. They collect metrics along serval dimensions. The SPACE framework looks along the lines of: Satisfaction/Well-being; Productivity; Activity; ...
blog.danwald.me
December 5, 2024 at 1:27 AM