Semantic Vault

Semantic Vault

Design the data backbone of a RAG engine using vector embeddings and semantic chunking.

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Semantic Vault
  • 17 February, 2026
  • 3 Minutes

Semantic Vault

Design the data backbone of a RAG engine using vector embeddings and semantic chunking.

Prologue gave us the voice to command, Campaign gives us the memory to scale.

We need to design the foundational structure for a Retrieval-Augmented Generation (RAG) engine.

If orchestration is the conductor, the schema is the library where every score is indexed by its soul, not just its title.

Intent

You will design a multi-dimensional data schema that supports Vector Search and Relational Context, allowing for 100% retrieval accuracy in your AI agents.

Background

A RAG engine allows Gemini to look outside its training data and consult your private project files, documentation, and history before answering. But for this to work, we cannot simply dump text into a database. We must architect a Semantic Vault.


The RAG Anatomy

Standard databases find data by matching words (Key-Value). RAG engines find data by matching meaning (Vectors).

Transformations

  • Chunking: Breaking a long post into digestible Logical Islands.
  • Embedding: Converting those chunks into a list of numbers (a vector) representing their meaning.
  • Indexing: Storing them in a way that similar ideas are physically close to each other in mathematical space.

Semantic Chunking

The biggest failure in RAG is splitting text every 500 words regardless of the content. It is called Naive Chunking, and an Orchestrator uses contextual chunking.

Rules

  1. Logic Boundary: Never split a function in the middle.
  2. Overlap: Always keep 10-15% of the previous chunk in the next one to maintain the thread of thought.
  3. Metadata Enrichment: Every chunk must carry its ancestry file name, author, and timestamp.

Designing the Vault

We are going to use a hybrid schema. We want the speed of a vector database (like Chroma or Pinecone) with the structure of metadata.

  1. Vector Layer
    Store the embedding (the mathematical soul of the text).

  2. Metadata Layer
    Store the source_url, chunk_index, and technical_stack.

  3. Relationship Layer
    Link chunks back to the parent campaign or technical tale.


Schema Generator

We will use Gemini to generate our database schema. By providing our cognitive map, the AI will build a structure it knows how to query.

schema.py
import google.generativeai as genai
import os
genai.configure(api_key=os.environ["GEMINI_API_KEY"])
prompt = """
<role>Database Architect & AI Specialist</role>
<task>Design a JSON schema for a RAG Knowledge Base.</task>
<constraints>
Use standard TypeScript interfaces. Include Vector dimensions (1536) and Metadata (Author, Date).
</constraints>
"""
model = genai.GenerativeModel('gemini-1.5-pro')
response = model.generate_content(prompt)
print(response.text)

Conclusion

A well-designed schema is the difference between an AI that hallucinates and an AI that knows. By building a Semantic Vault, you are creating a permanent memory for your project that scales as your technical journey grows.

Architecture is the only defense against entropy.

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