What Happens Inside an OCR API Call - OCR Fundamentals for Backend Developers
OCR finds text, then reads it. From classic pipelines to deep learning, masking a contract with CLOVA OCR before a VLM, and how a VLM differs from OCR.
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LLM API Gateway: OpenRouter, LiteLLM, and Cloudflare
An LLM API gateway puts OpenAI, Anthropic, and Gemini calls in one place. Compare OpenRouter, LiteLLM, and Cloudflare on latency, fallback, cache, and budgets.
Stopping Concurrent Double Bookings - PostgreSQL EXCLUDE Constraints
Overlapping bookings for one room arrive together. A PostgreSQL EXCLUDE constraint accepts only one. How to declare it, and how it works.
When AI Caching Pays Off
An AI API cache hit reuses input-prefix KV, not a stored answer. Which requests hit, the break-even rate after write cost, and agent versus chatbot logs.
Monitoring a LiteLLM Proxy - What the Admin UI Covers, and What Only Grafana and Langfuse Show
Prometheus, Grafana, and Langfuse on a LiteLLM proxy, same mock traffic for 14 minutes. What the Admin UI shows, and when to add the other two.