# ── Required ──────────────────────────────────────────────
OPENAI_API_KEY=sk-your-openai-key-here

# ── Path overrides (optional, all have defaults) ──────────
RAG_PERSIST_DIR=db/chroma_db
RAG_DOCS_DIR=docs
RAG_METRICS_DIR=metrics
RAG_COLLECTION=telecom_rag

# ── Model selection ───────────────────────────────────────
EMBED_MODEL=text-embedding-3-small
CHAT_MODEL=gpt-4o
CHAT_TEMPERATURE=0

# ── Retrieval tuning ──────────────────────────────────────
RETRIEVAL_K=8          # Candidates fetched from ChromaDB
SCORE_THRESHOLD=0.35   # Min cosine similarity (0‒1); raise for precision
MAX_CONTEXT_DOCS=5     # Max chunks sent to the LLM per query

# ── Token optimisation ────────────────────────────────────
MAX_HISTORY_TURNS=6    # Compress chat history after this many Q/A pairs
HIGHLIGHT_SENTENCES=5  # Sentences extracted per chunk via keyword overlap
MAX_CHUNK_CHARS=1200   # Hard cap on each chunk after highlighting