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---
name: change
description: Track and inspect graph changes, diffs, temporal updates, and the impact of new data on Semantica knowledge graphs.
---
# /semantica:change
Inspect changes over time and evaluate updates. Usage: `/semantica:change <task> [args]`
`$ARGUMENTS` = task + optional node, time window, or filter.
---
## `diff [--from <ts>] [--to <ts>] [--node <id>]`
Compute graph diffs between two snapshots.
```python
from semantica.provenance.change_tracker import ChangeTracker
from semantica.context import ContextGraph
tracker = ChangeTracker()
diff = tracker.compute_diff(from_ts=from_ts, to_ts=to_ts, node_id=node_id)
```
Output: added/removed nodes and edges, attribute changes, and impact summary.
---
## `history <node_id> [--limit N]`
Show the change history for a node or relationship.
```python
history = tracker.get_node_history(node_id=node_id, limit=limit)
```
Return: revisions, timestamps, authors, and summary comments.
