Today I Learned
By Pradyumna Chippigiri
AI
DevOps
Frontend
Python
SQL
System Design
AI
RAG re-ranking in two-stage retrieval
Best LLM & Transformer Visualizations
llms.txt endpoint
Blown away by amazon q + mermaid
DevOps
p50, p95, p99 Latencies
SLI vs SLO vs SLA
DORA metrics
Frontend
Loading images faster
Converting images to WebP using coding agents
Python
append vs extend vs + for lists
*args and **kwargs in Python
Dataclass in Python
uv vs pip
SQL
EXPLAIN vs EXPLAIN ANALYZE
CTEs in SQL
Finding rows with same value
SQL is null vs = null
System Design
Local SSD (NVMe) vs Network SSD (Block Storage)
Time-series delta encoding
RLE Run Length Encoding
Pull vs Push CDN
2-random cache eviction