Retrieval-Augmented Self-Recall — Part 2: Hybrid RAG on Nothing but Postgres

RE-call implements a hybrid RAG system using Postgres to store dense vectors, full-text indices, and metadata, arguing that dedicated vector databases are unsuitable for agent memory. To ensure safety, RE-call utilizes a custom benchmarking harness that evaluates both retrieval accuracy and the ability to identify unanswerable queries. Following community feedback and rigorous experimentation, RE-call v0.3 was released, incorporating reproducible improvements and a detailed entailment supersession study to refine the system's overall performance.