Do You Need a Glean? I Self-Hosted Onyx and Rebuilt It on Postgres — Same Corpus, Same Local LLM

The enterprise-knowledge-search question is really build-vs-buy: pay for Glean, self-host the open-source Onyx, or build RAG on the Postgres you already run. Instead of a feature table, I stood up the full Onyx platform AND wrote the entire Postgres alternative in ~80 lines, pointed both at the same local Qwen 27B over the same company knowledge base, and asked the same questions. Both gave…