Add modern-pattern rows to the pattern landscape #1487

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opened 2026-11-01 16:00:21 +00:00 by jared · 0 comments

jared commented

2026-11-01 16:00:21 +00:00

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Problem

docs/system-design-format/pattern-landscape.md has no rows for modern system-design patterns. The step 6 rule says no row is dropped, and the table should cover one modern source.

Reproduce

n/a: documentation gap.

Approach

Add rows for CQRS, event sourcing, and the Rack-style middleware chain, with the table's columns (pattern, source, scale group, signals and facts, extracted now, extraction cost, preference blank), a bin for each, and entries in the reverse index.

Required work:

Add the three rows — check: present CQRS in docs/system-design-format/pattern-landscape.md

Acceptance criteria

Given pattern-landscape.md, when read, then CQRS, event sourcing, and middleware chain each have a row with a bin and a scale group.
Given the reverse index, when read, then each new row appears under its signals.

Origin

Trigger: system-model steps 7 and 8 (os-sdlc journeys, commit 8c28fd4f; course check in docs/system-design-format/README.md section 6)
Improvised this session: none
Chain: modern patterns missing from the table ← step 6 chose sources without a modern one ← DESIGN (plugins/os-sdlc/lib/os_sdlc/system_model/writer/journey_file.rb)
Root candidate: none found; searched journey, journey_file, Writer, pattern-landscape
Where: docs/system-design-format/pattern-landscape.md
Session: 313ee80d-b132-4de6-a01d-e1a57fbd3450
Transcript: /home/jared/.claude/projects/-home-jared-dev-cc-os/313ee80d-b132-4de6-a01d-e1a57fbd3450.jsonl

VERDICT: CREATE

## Problem `docs/system-design-format/pattern-landscape.md` has no rows for modern system-design patterns. The step 6 rule says no row is dropped, and the table should cover one modern source. ## Reproduce n/a: documentation gap. ## Approach Add rows for CQRS, event sourcing, and the Rack-style middleware chain, with the table's columns (pattern, source, scale group, signals and facts, extracted now, extraction cost, preference blank), a bin for each, and entries in the reverse index. Required work: 1. Add the three rows — check: present `CQRS` in `docs/system-design-format/pattern-landscape.md` ## Acceptance criteria 1. Given pattern-landscape.md, when read, then CQRS, event sourcing, and middleware chain each have a row with a bin and a scale group. 2. Given the reverse index, when read, then each new row appears under its signals. ## Origin - Trigger: system-model steps 7 and 8 (os-sdlc journeys, commit 8c28fd4f; course check in docs/system-design-format/README.md section 6) - Improvised this session: none - Chain: modern patterns missing from the table ← step 6 chose sources without a modern one ← DESIGN (plugins/os-sdlc/lib/os_sdlc/system_model/writer/journey_file.rb) - Root candidate: none found; searched journey, journey_file, Writer, pattern-landscape - Where: docs/system-design-format/pattern-landscape.md - Session: 313ee80d-b132-4de6-a01d-e1a57fbd3450 - Transcript: /home/jared/.claude/projects/-home-jared-dev-cc-os/313ee80d-b132-4de6-a01d-e1a57fbd3450.jsonl VERDICT: CREATE

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2026-11-01 16:00:21 +00:00

jared referenced this issue

2026-11-01 16:00:30 +00:00

Write the pattern landscape table (system-model step 6) #1480