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ottyl/tickets/018-sequence-diagram.md
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2026-09-05 12:46:45 +01:00

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# 018 — Sequence diagram of events (future idea)
> The README lists this under "Ideas... that can be implemented in the future, but
> not now." Not scoped for current implementation — tracked here so it isn't lost.
## Summary
Let users declare sequence-diagram participants from params or matchers (e.g.
`node_id`), then render a sequence diagram of captured events of interest. No
relation between nodes is modeled — only event sequence/ordering determines the
diagram.
## Scope (sketch, not final)
- Participant declaration referencing an existing param
([001](001-param-declarations.md)), e.g. "one participant per distinct value of
`node_id`".
- Event-of-interest selection, likely reusing FilterBar syntax
([005](005-filterbar-pest-parser.md)) to define which log lines become diagram
events.
- Rendering: a sequence-diagram view (e.g. mermaid `sequenceDiagram`) driven by
ordered matching events per participant.
## Depends on
- [001 — Param declarations](001-param-declarations.md)
- [005 — FilterBar pest parser](005-filterbar-pest-parser.md) (likely, for
event-matcher syntax reuse)