This is the v2.0 upgrade of the Indian FMCG product catalog project: the same discovery/enrichment pipeline (Ollama + pgvector + S3 image storage), now with a Retrieval-Augmented Generation (RAG) layer and a React UI in place of the old Streamlit app.

Two independent pieces:

backend/ - FastAPI service. Browse/search/chat endpoints over a pgvector-backed catalog; a RAG chat endpoint that retrieves relevant products and asks a local Ollama model to answer grounded in them.
frontend/ - React + Vite single-page app: product search/browse grid, a conversational "Ask AI" panel with source citations, and an admin page to ingest new brands.

See docs/ for the full architecture write-up, setup guide, and API reference. The two component READMEs (backend/README.md, frontend/README.md) are quick local references once you've read the main docs once.

v3.0 update: this project now also includes a Multi-Store Intelligence layer - 5 simulated stores with independent pricing and inventory, ML-based dynamic discounts, trending-product detection, a hybrid recommendation engine, and a full analytics dashboard. See docs/CHANGES.docx for the complete write-up (architecture decisions, database schema, API reference, and setup guide), or jump straight to backend/scripts/seed_store_intelligence.py and backend/scripts/train_ml_models.py to try it.

v3.1 update: added an AI Nutritional Intelligence module - verified nutrition facts retrieved from Open Food Facts (never LLM- generated), transparent/configurable health & nutrition scoring, allergen and diet-compatibility detection, ML-based nutritional similarity and clustering, healthier-alternative suggestions, personalized nutrition recommendations, and a nutrition analytics dashboard. See docs/NUTRITION_MODULE.docx for the complete write-up, or jump straight to backend/scripts/enrich_nutrition.py and backend/scripts/train_nutrition_models.py to try it.

Fastest path to a working demo

# 1. Backend
cd backend
python3 -m venv .venv && source .venv/bin/activate   # Windows: .venv\Scripts\activate
pip install -r requirements.txt
cp .env.example .env                                  # edit DB_PASSWORD, see docs
docker compose -f ../docker-compose.yml up -d          # local Postgres+pgvector (skip if you already have one)
python scripts/seed_sample_data.py                     # loads bundled sample catalogs - no LLM needed
ollama pull qwen2.5:1.5b                                # one-time
uvicorn app.main:app --reload --port 8000

# 2. Frontend (new terminal)
cd frontend
npm install
npm run dev

Open http://localhost:5173, pick a brand, try the search bar, then switch to Ask AI and ask something like "recommend a low sugar biscuit".

Why this exists (what changed from v1.0)

The original project (Project_LLM) could discover, enrich, and store products with embeddings in pgvector - but nothing ever read those embeddings back out. There was no similarity-search function, no API layer (app/api/ was an empty folder), and the UI was a Streamlit app that only ever queried the catalog by exact brand/category, never by meaning. This project adds the missing retrieval layer (vector_store.semantic_search), a RAG orchestration service (rag_service.py), a full FastAPI surface, and a React UI to use it.

It also fixes a real security issue: app/infrastructure/settings.py used to hard-code a live database host/port/password as Python literal fallbacks. Every credential now comes only from environment variables/.env - see backend/app/infrastructure/settings.py for details, and docs/ for the full write-up.