Implement graph transaction history and revisions #96

Merged

lost-rob0t merged 11 commits from agent/issue-9-graph-history into main

2026-07-26 14:03:23 +00:00

lost-rob0t commented

2026-07-26 13:57:41 +00:00

(Migrated from github.com)

Closes #9

What changed

add revisioned graph transaction state under src/core
advance revision exactly once for accepted commits, undo, and redo
group one command or an atomic command batch into one transaction
record immutable before/after snapshots, commands, effects, timestamps, and revision metadata
add bounded undo and redo stacks
restore graph data, positions, selection, layout, and viewport deterministically
reject stale expected revisions
clear the redo branch after a new edit
preserve state when commands fail or history is empty

Validation

single-command revision advancement
batch-as-one-unit undo
deterministic redo
stale commit/undo/redo rejection
failed-command history rollback
redo-branch clearing
bounded history behavior
zero-history-limit behavior
empty transaction rejection
independent transaction snapshots

The history layer remains platform-independent and composes the canonical graph command engine from #8.

Closes #9 ## What changed - add revisioned graph transaction state under `src/core` - advance revision exactly once for accepted commits, undo, and redo - group one command or an atomic command batch into one transaction - record immutable before/after snapshots, commands, effects, timestamps, and revision metadata - add bounded undo and redo stacks - restore graph data, positions, selection, layout, and viewport deterministically - reject stale expected revisions - clear the redo branch after a new edit - preserve state when commands fail or history is empty ## Validation - single-command revision advancement - batch-as-one-unit undo - deterministic redo - stale commit/undo/redo rejection - failed-command history rollback - redo-branch clearing - bounded history behavior - zero-history-limit behavior - empty transaction rejection - independent transaction snapshots The history layer remains platform-independent and composes the canonical graph command engine from #8.