PostgreSQL
21 articles · written by Niraj Kumar
PostgreSQL keeps absorbing jobs that used to need separate infrastructure: vector search via pgvector, full-text search good enough to skip Elasticsearch for many workloads, row-level multi-tenancy via RLS, and durable job or agent state. These articles lean into that.
Coverage includes hybrid retrieval combining pgvector embeddings with native full-text search using Reciprocal Rank Fusion, Row-Level Security as a hard tenant boundary for AI SaaS, LangGraph checkpointers backed by Postgres, GraphRAG-style multi-hop traversal, and a direct comparison with MongoDB for teams still choosing.
The bias throughout is toward keeping things in one database until there is a measured reason not to.
- AI AgentsLangGraphDocker
Architecting Sandboxed Code-Execution Agents: Ephemeral Docker Runtimes, LangGraph, and Real-Time Telemetry in Next.js
Build a zero-trust, sandboxed AI coding agent with LangGraph, Ollama, and Claude Code that runs Python, C++, and JavaScript in ephemeral, network-restricted Docker containers on AWS Linux, with JWT execution policies, PostgreSQL audit trails, and live Socket.io telemetry in a Next.js workspace.
- MCPModel Context ProtocolLangGraph
Engineering Custom MCP Servers for Local AI Agents: Bridging PostgreSQL, MongoDB, and REST APIs with LangGraph and Next.js
A hands-on 2026 guide to building secure TypeScript MCP servers that connect local Ollama models and Claude Code to PostgreSQL, MongoDB, and REST APIs, orchestrated with LangGraph, streamed to a Next.js dashboard, and deployed with Docker and Nginx on AWS.
- LangGraphHuman-in-the-LoopAI Agents
Engineering Durable Human-in-the-Loop (HITL) AI Workflows: State Checkpointing with LangGraph, PostgreSQL, and Next.js
Build enterprise-grade human-in-the-loop AI agents that pause for approval before Stripe or Razorpay payouts. Learn LangGraph interrupts, PostgreSQL checkpointing, Socket.io real-time dashboards in Next.js, an Express resume API, JWT/OAuth RBAC, n8n alerts, and Docker deployment on AWS.
- Graph RAGLangChainPostgreSQL
Architecting an Enterprise Graph RAG Pipeline: Semantic Knowledge Discovery with LangChain, PostgreSQL, and Next.js
Build a sovereign, entity-aware Graph RAG pipeline with LangChain, Ollama, PostgreSQL and pgvector, an Express.js API and a Next.js + Shadcn UI frontend, then ship it with Docker, Nginx and GitHub Actions on AWS.
- Payment Gateway IntegrationNode.jsExpress.js
Architecting Multi-Gateway Payment Systems: Orchestrating Webhooks with Node.js, n8n, and PostgreSQL on AWS
A practical 2026 blueprint for building a resilient multi-gateway payment backend. Integrate Stripe, Razorpay, and Cashfree with Express.js and PostgreSQL idempotency, automate reconciliation with self-hosted n8n and Make.com, push real-time updates with Socket.io, and ship it all with Docker, CI/CD, and AWS.
- Agentic RAGLangGraphOllama
Building a Privacy-First Agentic RAG System: Integrating Ollama, LangGraph, and PostgreSQL in a Next.js App
Learn how to build a local, privacy-first agentic RAG system using Ollama, LangGraph, PostgreSQL with pgvector, and a Next.js frontend with Shadcn UI. Step-by-step code, Docker setup, best practices, and common mistakes.
- PostgreSQLCDCSemantic Cache
How to Prevent AI Context Poisoning using PostgreSQL CDC for Real-Time Semantic Cache Invalidation in Node.js
Learn how to stop stale semantic caches from poisoning your AI agents. Build a real-time invalidation pipeline with PostgreSQL CDC, a Node.js worker, and an embedding similarity radius to flush outdated cache entries instantly.
- LangGraphPostgreSQLAI Agents
How to Implement Transactional State Rollbacks for AI Agents in LangGraph and PostgreSQL
Learn how to wrap LangGraph tool nodes in PostgreSQL savepoints, roll back partial failures deterministically, and stop duplicate billing before your LLM retries.
- LangGraph.jsAI AgentsContext Engineering
How to Implement Hierarchical Context Compaction in LangGraph.js to Prevent Agent Context Drift
A practical, code-first guide to building a hierarchical context compaction layer in LangGraph.js — using Ollama for local summarization and PostgreSQL checkpointing to stop long-running AI agents from drifting off-goal.
- pgvectorPostgreSQLNode.js
How to Sync pgvector Embeddings in Real-Time using PostgreSQL Triggers and Node.js Background Workers
Stop relying on cron jobs for vector search. Learn how to build a real-time, event-driven pipeline using PostgreSQL triggers, an outbox table, and isolated Node.js background workers to keep pgvector embeddings fresh without locking your production database.
- RPACrewAIPlaywright
How to Replace Legacy RPA with Autonomous Multi-Agent Workflows using CrewAI, Playwright, and Node.js
Learn how to replace brittle, rule-based RPA scripts with resilient, goal-driven multi-agent systems built with CrewAI, Playwright, and Node.js. Includes real code for autonomous web navigation, JSON validation, and PostgreSQL integration.
- OpenTelemetryNext.jsPostgreSQL
How to Track Per-Tenant LLM Token Costs in Next.js using OpenTelemetry and PostgreSQL
Instrument Next.js with OpenTelemetry, trace server-side LangChain calls, and attribute AI inference costs per tenant in PostgreSQL for usage billing.
- RAGPostgreSQLNext.js
How to Build a Secure Multi-Tenant RAG Pipeline using PostgreSQL Row-Level Security, Next.js, and JWT Auth
Stop cross-tenant leaks in B2B AI SaaS — PostgreSQL Row-Level Security for embeddings, tenant IDs from Next.js JWTs, and isolated retrieval.
- LangGraphHuman-in-the-LoopPostgreSQL
How to Implement Human-in-the-Loop (HITL) Approval Gates in LangGraph with PostgreSQL Checkpointers
Build production human-in-the-loop approval gates in LangGraph with AsyncPostgresSaver, interrupt_before, and Command-based resume flows.
- GraphRAGLangChainOllama
How to Build a Local GraphRAG Pipeline with PostgreSQL, LangChain, and Ollama for Multi-Hop Reasoning
Build a fully local GraphRAG system with LangChain, Ollama and PostgreSQL — extract entity triplets, store a knowledge graph, run multi-hop queries.
- MCPTypeScriptClaude Code
How to Build a Custom Model Context Protocol (MCP) Server in TypeScript for Claude Code
Build an MCP server in TypeScript with the official SDK — expose PostgreSQL inspection tools over stdio, sanitize queries, and wire it into Claude Code.
- n8nOllamaDocker
How to Self-Host a Zero-Cost, Privacy-First AI Automation Pipeline using n8n, Ollama, and Docker
Build a fully self-hosted, zero-cost AI automation pipeline with n8n, Ollama, Docker and PostgreSQL — process webhooks with local LLMs, stay offline.
- pgvectorPostgreSQLRAG
How to Implement Hybrid Search with pgvector and Full-Text Search in PostgreSQL for Node.js RAG Pipelines
Combine pgvector embeddings with PostgreSQL full-text search using Reciprocal Rank Fusion for accurate, hallucination-resistant RAG in Node.js.
- RAGOllamaLangChain
How to Build a Local RAG Pipeline Using Ollama, LangChain, and PostgreSQL
Set up a private, offline RAG system by connecting locally hosted LLMs via Ollama to a PostgreSQL pgvector database using LangChain.
- PostgreSQLMongoDBDatabase
PostgreSQL vs MongoDB: Choosing the Right Database for Your Project
PostgreSQL and MongoDB compared on schema design, scaling, consistency and developer experience — a practical way to pick one and move on.
- TypeScriptNext.jsNode.js
Full-Stack TypeScript for 2026: Building a Job-Ready App with Next.js, Node, and Postgres
Build a production full-stack TypeScript app with Next.js, Node.js and PostgreSQL — setup to deploy, with the patterns hiring teams expect.
Related topics
- Retrieval-Augmented Generation (RAG)
- LangChain & LangGraph
- Large Language Models
- AI Agents
- Next.js
- React
- TypeScript
- Node.js
- Docker & Containers
- DevOps
- CI/CD
- Application Security
- AWS
- n8n Automation