Research

1. The Challenge of Determinism Generative models are probabilistic. Achieving structured JSON news summaries (with mandatory keys, exact string arrays, and no markup wrapper) requires strict system formatting guidelines: ```json { "summary": "bulleted points", "category": "Technology | AI | Startups", "keywords": ["maximum 3 strings"] } ``` Enforcing this schema at the model layer is done using Gemini's structured output configuration: ```typescript responseSchema: Schema.json({ type: Type.OBJECT, properties: { ... } }) ```

2. Vector Deduplication Using `pgvector`, we convert titles into 768-dimension vectors and run cosine queries: ```sql SELECT title, 1 - (title_vector <=> candidate_vector) AS similarity FROM articles ORDER BY similarity DESC LIMIT 1; ``` Empirical testing shows that a cosine similarity threshold of `0.85` accurately filters duplicated content from different feeds while preserving sequels or continuous updates.