docs(quick-260618-smr): remove unused Redis service and references

.planning/quick/260618-smr-remove-unused-redis-service-and-referenc/260618-smr-PLAN.md

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+---
+quick_id: 260618-smr
+slug: remove-unused-redis-service-and-referenc
+description: Remove unused Redis service and references
+type: quick
+created: 2026-06-19
+files_modified:
+  - docker-compose.yml
+  - docker-compose.dev.yml
+  - CLAUDE.md
+  - README.md
+  - docs/ARCHITECTURE.md
+  - docs/CONFIGURATION.md
+  - docs/deployment.md
+  - docs/DEVELOPMENT.md
+  - docs/GETTING-STARTED.md
+  - docs/TESTING.md
+  - apps/pwa/e2e/README.md
+  - apps/pwa/playwright.config.ts
+---
+
+# Quick Task 260618-smr: Remove unused Redis service and references
+
+## Why
+
+Redis is confirmed **unused at runtime**: no `ioredis`/redis client import, no `REDIS_*`
+env vars read in code, and `ioredis` is not a dependency in any `package.json`. It exists
+only as a compose service + documentation references that imply it is part of the stack or
+"reserved for future pub/sub". Decision: drop the container and all references (keep the
+in-memory-vs-Redis design-rationale comments — see Constraint below).
+
+## Tasks
+
+### Task 1 — Remove the redis service from compose
+- `docker-compose.yml`: delete the `redis:` service block (`image: redis:7-alpine` + its
+  comment) so only `api`, `mariadb`, and the `volumes:` block remain. The api `depends_on`
+  lists only `mariadb` — leave it untouched.
+- `docker-compose.dev.yml`: delete the `redis:` ports override block (`ports: - '6379:6379'`).
+- verify: `grep -ri redis docker-compose.yml docker-compose.dev.yml` returns nothing.
+- done: neither compose file references redis; `docker compose config` still parses.
+
+### Task 2 — Clean documentation references
+Remove/adjust every Redis mention so no doc implies Redis is part of the stack:
+- `CLAUDE.md`: delete the Constraints line "Redis available (optional, …)"; delete the
+  `ioredis` row from the Supporting Libraries table; delete the "Redis is present in the
+  stack but not yet used…" sentence from the architecture paragraph (keep the rest of the
+  sentence about SSE/EventEmitter); change the compose-tree comment `(api + mariadb + redis)`
+  → `(api + mariadb)`.
+- `README.md`: drop "Redis" from the prerequisites line; drop `redis` from the
+  `docker compose … up mariadb redis` command; drop ", Redis 7" from the compose-file
+  description; change "expose DB/Redis ports" → "expose DB ports"; change the Live-sync row
+  "Server-Sent Events + Redis 7 pub/sub" → "Server-Sent Events (in-process EventEmitter)".
+- `docs/ARCHITECTURE.md`: delete the `Redis` table row.
+- `docs/CONFIGURATION.md`: drop "and Redis on `localhost:6379`".
+- `docs/deployment.md`: delete the `redis` services-table row.
+- `docs/DEVELOPMENT.md`: remove the four Redis mentions (prereq bullet, "### 2. Start the dev
+  database and Redis" heading → "Start the dev database", the two `up mariadb redis` commands
+  → `up mariadb`, the "Exposes Redis on `localhost:6379`" bullet, and the
+  "(API in Docker + MariaDB + Redis…)" comment → "(API in Docker + MariaDB…)").
+- `docs/GETTING-STARTED.md`: prereq row "Used to run MariaDB and Redis locally" → "MariaDB";
+  `up -d mariadb redis` → `up -d mariadb`; "and Redis (`localhost:6379`)" removed from prose.
+- `docs/TESTING.md`: "The API, MariaDB, and Redis must already be running" → "The API and
+  MariaDB must already be running".
+- `apps/pwa/e2e/README.md`: delete the "- Redis on `:6379`" bullet.
+- `apps/pwa/playwright.config.ts`: update the two comments listing
+  "API+MariaDB+Redis are compose-managed" → "API+MariaDB are compose-managed".
+- verify: `grep -rniE redis CLAUDE.md README.md docs apps/pwa/e2e apps/pwa/playwright.config.ts`
+  returns nothing (case-insensitive, excluding the word "credential").
+- done: no doc/config implies Redis is in the stack.
+
+## Constraint — KEEP these (do NOT touch)
+The in-memory-vs-Redis **design-rationale** comments document why in-memory is used instead
+of Redis (decisions D-12/D-18) and must remain:
+- `apps/api/src/lib/listEmitter.ts`
+- `apps/api/src/broker/reminderScheduler.ts`
+- `apps/api/src/auth/linkNonceStore.ts`
+- `apps/api/src/routes/localAuth.ts`
+
+## must_haves
+- truth: "No redis service exists in either compose file"
+- truth: "No documentation or e2e config references Redis as part of the stack"
+- truth: "The D-12/D-18 in-memory-vs-Redis rationale comments in the 4 source files are intact"
+- artifacts: [docker-compose.yml, docker-compose.dev.yml, CLAUDE.md, README.md, docs/*, apps/pwa/e2e/README.md, apps/pwa/playwright.config.ts]

.planning/quick/260618-smr-remove-unused-redis-service-and-referenc/260618-smr-SUMMARY.md

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+---
+quick_id: 260618-smr
+slug: remove-unused-redis-service-and-referenc
+description: Remove unused Redis service and references
+status: complete
+completed: 2026-06-18
+duration: ~10m
+tasks_completed: 2
+tasks_total: 2
+files_modified:
+  - docker-compose.yml
+  - docker-compose.dev.yml
+  - CLAUDE.md
+  - README.md
+  - docs/ARCHITECTURE.md
+  - docs/CONFIGURATION.md
+  - docs/deployment.md
+  - docs/DEVELOPMENT.md
+  - docs/GETTING-STARTED.md
+  - docs/TESTING.md
+  - apps/pwa/e2e/README.md
+  - apps/pwa/playwright.config.ts
+decisions:
+  - Redis dropped entirely from compose and all docs; in-memory EventEmitter is the live-sync mechanism (D-12/D-18 rationale comments in source preserved)
+---
+
+# Quick Task 260618-smr: Remove unused Redis service and references — Summary
+
+## One-liner
+
+Dropped the unused `redis:7-alpine` compose service and scrubbed every documentation/config reference implying Redis is part of the stack, while preserving the D-12/D-18 in-memory-vs-Redis design-rationale comments in source.
+
+## Tasks Completed
+
+| Task | Description                          | Commit  | Files                                                      |
+| ---- | ------------------------------------ | ------- | ---------------------------------------------------------- |
+| 1    | Remove redis service from compose    | 269e474 | docker-compose.yml, docker-compose.dev.yml                 |
+| 2    | Clean documentation references       | 8255be6 | CLAUDE.md, README.md, docs/*, apps/pwa/e2e/README.md, apps/pwa/playwright.config.ts |
+
+## Verification Results
+
+- `grep -ri redis docker-compose.yml docker-compose.dev.yml` → no output (clean)
+- `docker compose -f docker-compose.yml -f docker-compose.dev.yml config` → PARSE OK
+- `grep -rniE redis CLAUDE.md README.md docs apps/pwa/e2e apps/pwa/playwright.config.ts` → no output (clean)
+- `pnpm format:check` → all matched files use Prettier code style
+- Protected source files (listEmitter.ts, reminderScheduler.ts, linkNonceStore.ts, localAuth.ts) → untouched (git diff confirms no changes)
+
+## Docker Compose Config
+
+`docker compose -f docker-compose.yml -f docker-compose.dev.yml config` parsed successfully with no Redis service — confirmed available on this host.
+
+## Deviations from Plan
+
+None — plan executed exactly as written.
+
+## Known Stubs
+
+None.
+
+## Self-Check: PASSED
+
+- Commits 269e474 and 8255be6 exist in git log
+- All 12 modified files confirmed updated
+- Grep verifies zero Redis references in target files
+- Protected source files confirmed untouched