Research

Temporal knowledge graphs track how facts change over time via valid_from/valid_until on edges. Enables queries like "what did the user prefer last month vs now" and prevents stale facts from overriding recent ones. Pairs well with existing Ebbinghaus eviction policy.

Proposal

Add valid_from/valid_until columns to graph memory edges table. Use during graph_recall to prefer recent facts and support temporal reasoning.

Sources

• https://dev.to/sruthi_a_d59eeac85da1abc6/why-ai-agents-need-a-knowledge-graph-not-just-memory-h62
• https://arxiv.org/abs/2504.19413