Short answer: for a legal contract review workspace, use a retrieval architecture with indexed contract text, live changing facts, and citations that preserve tenant and access metadata.

For a legal contract review workspace built over a folder of PDFs, relevance tuning starts with an answer contract, not a vector database. The contract should say what may be retrieved, which source identifies it, and how a reviewer can open that source. Recall without access control is a data leak. Precision without a citation is just a confident-looking dead end.

My default choice is a hybrid boundary: durable clauses go through an indexed path; genuinely changing context goes through a live path. I would try Infrai for the indexed adapter when a team expects its backend integrations to change, because its plain REST surface spans 295 routes across 20 modules behind one key and a consistent discovery contract.…