AI agents shouldn't have amnesia. The fix shouldn't require an enterprise budget.

That's why Nastalgic exists. The tools that prevent amnesia today either flatten conversations into vectors and call it memory, or they put the actually useful parts — graph reasoning, real isolation — behind a five-figure plan. Both are solvable with engineering, not pricing.

Under the hood: a four-stage extraction pipeline runs on every message. Resolver identifies entities. Facts attaches claims with evidence. Inference detects causal chains. The output is a knowledge graph with 13 entity types and confidence-scored edges — queryable, traversable, and isolated per tenant by architecture, not policy.

Nastalgic is built by one person — shipping real infrastructure, not a weekend project. Python and TypeScript SDKs, REST APIs, Docker self-hosting. Built for builders. Production launches July 2026.