Module lifecycle 

Node lifecycle: access tracking, importance decay, stale tagging, and stats.

Functions

compute_stats

Compute aggregate statistics about the knowledge graph.

decay_importance

Gradually decay importance for nodes not accessed in days.

tag_stale_nodes

Tag nodes not updated within days as stale by appending “stale” to tags.

touch_node

Record an access event: increment access_count and update accessed_at.

touch_nodes

Batch-touch multiple nodes.