Add rag module: Spring AI 2.0 RAG with pgvector, chunking, reranking and a faithfulness check

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 19:09:05 +00:00
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+# QuestionAnswerAdvisor: the smallest RAG
+
+only the prompts are recorded: what a real model would reply is not something this repository tests
+
+--- the prompt the model received ---
+How many days of annual leave do employees get?
+
+Context information is below, surrounded by ---------------------
+
+---------------------
+4.1 Annual Leave Entitlement. Full-time employees are entitled to 20 working days
+of annual leave per calendar year. Part-time employees receive leave pro rata.
+
+4.2 Leave Carryover. Unused annual leave may be carried over for a maximum of 5 days
+into the next calendar year and must be used by 31 March.
+4.3 Requesting Leave. All leave requests must be submitted through the HR portal
+at least two weeks in advance for absences longer than three days.
+
+4.7 Sick Leave. Sick leave is separate from annual leave and is not deducted from it.
+A medical certificate is required after three consecutive days.
+---------------------
+
+Given the context and provided history information and not prior knowledge,
+reply to the user comment. If the answer is not in the context, inform
+the user that you can't answer the question.
+
+
+--- the prompt for an off-topic question (nothing passes the threshold) ---
+What is the capital of Mongolia?
+
+Context information is below, surrounded by ---------------------
+
+---------------------
+---------------------
+
+Given the context and provided history information and not prior knowledge,
+reply to the user comment. If the answer is not in the context, inform
+the user that you can't answer the question.
+