Register chat_backend for django deploy (chat_backend#6 Part B).

Add app_catalog entry, host_apps on adama/roslin/ai-server-4080 (prod
:8003), and document ports/NPM/Postgres/Ollama for active/active.

Co-authored-by: Cursor <cursoragent@cursor.com>

IMPLEMENTATION.md

@@ -187,15 +187,18 @@ After Docker install, re-SSH so the `docker` group membership takes effect.
 
 ### Apps
 
-| App | Type | Hosts | Notes |
-|-----|------|-------|-------|
-| `company_site` | django (docker) | adama + roslin | active/active behind NPM |
-| `dta_service` | django (docker) | adama + roslin + ai-server-4080 | active/active behind NPM |
-| `dta_webapp` | node/vite static | adama + roslin | active/active; built to `/var/www/<env>_dta_webapp`, served by web-static nginx |
+| App | Type | Hosts | Envs | Notes |
+|-----|------|-------|------|-------|
+| `company_site` | django (docker) | adama + roslin (+ ai-server-4080) | prod | active/active behind NPM; beta port reserved |
+| `dta_service` | django (docker) | adama + roslin + ai-server-4080 | beta + prod | active/active behind NPM |
+| `dta_webapp` | node/vite static | adama + roslin (+ ai-server-4080) | beta + prod | active/active; built to `/var/www/<env>.app.ditchtheagent/html`, served by web-static nginx |
+| `scha` | django (docker) | adama + roslin + ai-server-4080 | prod | active/active behind NPM; beta port reserved |
+| `chat_web_app` | node-static (CRA) | adama + roslin + ai-server-4080 | prod | active/active; built to `/var/www/<env>.chat.aimloperations/html`, served by web-static nginx; beta port reserved |
+| `chat_backend` | django (docker) | adama + roslin + ai-server-4080 | prod | active/active behind NPM; Ollama via `OLLAMA_BASE_URL=http://10.0.0.128:11434`; beta port reserved |
 
-Both environments (`beta`, `prod`) are deployed. Django apps use a **shared external
-Postgres** (via `DATABASE_URL` in each host's env file) so active/active replicas
-share one database.
+Django apps use a **shared external Postgres** (via `DATABASE_URL` in each host's
+env file) so active/active replicas share one database. Beta and prod never share
+a DB.
 
 ### Data model
 
@@ -206,11 +209,18 @@ share one database.
 
 ### Ports
 
-| App | beta | prod |
-|-----|------|------|
-| company_site | 8010 | 8000 |
-| dta_service | 8011 | 8001 |
-| dta_webapp (nginx) | 8081 | 8080 |
+Reserved host ports for NPM upstreams. Ports must match across every host that
+serves the same app+env. Rows marked *not deployed* keep the port free for a
+future beta replica.
+
+| App | beta | prod | Deployed on |
+|-----|------|------|-------------|
+| company_site | 8010 (*not deployed*) | 8000 | adama, roslin, ai-server-4080 |
+| dta_service | 8011 | 8001 | adama, roslin, ai-server-4080 |
+| scha | 8012 (*not deployed*) | 8002 | adama, roslin, ai-server-4080 |
+| chat_backend | 8013 (*not deployed*) | 8003 | adama, roslin, ai-server-4080 |
+| dta_webapp (nginx) | 8081 | 8080 | adama, roslin, ai-server-4080 |
+| chat_web_app (nginx) | 8083 (*not deployed*) | 8082 | adama, roslin, ai-server-4080 |
 
 ### Flow
 
@@ -229,9 +239,10 @@ share one database.
   to host `{{ apps_env_dir }}` → git checkout at ref → copy `.env` into checkout →
   `docker compose build` → `up -d` → migrate (run once, shared DB).
 - **node-static**: git checkout at ref → `npm ci` → `npm run build:<env>`
-  (writes to `/var/www/<env>_dta_webapp`).
-- **web-static** role: one nginx container per app host (adama + roslin) serving
-  the static roots on their ports; NPM balances across both.
+  (writes to the app's `webroot_pattern`, e.g. `/var/www/{env}.app.ditchtheagent/html`
+  or `/var/www/{env}.chat.aimloperations/html`).
+- **web-static** role: one nginx container per app host serving the static roots
+  on their ports (from `host_apps`); NPM balances across hosts.
 
 ### Reverse proxy / load balancing (NPM at 10.0.0.230)
 
@@ -243,6 +254,15 @@ point each domain at the backend(s):
   adama+roslin you need the **Advanced** tab with a custom `upstream {}` block
   (or a real LB). Confirm this before relying on active/active.
 
+| App | Domains | Backends |
+|-----|---------|----------|
+| company_site | aimloperations.com (+ www) | `adama:8000` + `roslin:8000` |
+| dta_service | (see DTA NPM hosts) | `adama:8001` / `8011` + same on roslin / ai-server-4080 |
+| dta_webapp | (see DTA NPM hosts) | `adama:8080` / `8081` + same on roslin |
+| scha | `schawheaton.aimloperations.com`, `schawheaton.com` (+ www) | `adama:8002` + `roslin:8002` (+ `ai-server-4080:8002`) |
+| chat_web_app | `chat.aimloperations.com` (+ www) | `adama:8082` + `roslin:8082` (+ `ai-server-4080:8082`) |
+| chat_backend | `chatbackend.aimloperations.com` | `adama:8003` + `roslin:8003` + `ai-server-4080:8003` |
+
 ### Required changes IN each app repo (owned separately)
 
 - [ ] `docker-compose.prod.yml`: drop the bundled `db` service; `web` reads
@@ -252,7 +272,11 @@ point each domain at the backend(s):
       with a call to `server-infra/scripts/deploy.sh --app <name> --env <env> --ref <sha>`
       (keep the test/docker jobs).
 - [ ] `dta_webapp`: `npm run build:beta` / `build:prod` output to
-      `/var/www/beta_dta_webapp` / `/var/www/prod_dta_webapp`.
+      `/var/www/beta.app.ditchtheagent/html` / `/var/www/prod.app.ditchtheagent/html`.
+- [ ] `chat_web_app`: `npm run build:beta` / `build:prod` output to
+      `/var/www/beta.chat.aimloperations/html` / `/var/www/prod.chat.aimloperations/html`.
+
+Companion `chat_web_app` frontend is already registered in this infrastructure repo.
 
 ### Shared Postgres (10.0.0.230, same box as NPM)
 
@@ -266,8 +290,12 @@ do not).
 | company_site | beta | `company_site_beta` | `postgres://westfarn:<pw>@10.0.0.230:5432/company_site_beta` |
 | dta_service | prod | `dta_service` | `postgres://westfarn:<pw>@10.0.0.230:5432/dta_service` |
 | dta_service | beta | `dta_service_beta` | `postgres://westfarn:<pw>@10.0.0.230:5432/dta_service_beta` |
+| scha | prod | `scha` | `postgres://westfarn:<pw>@10.0.0.230:5432/scha` |
+| scha | beta | `scha_beta` | `postgres://westfarn:<pw>@10.0.0.230:5432/scha_beta` |
+| chat_backend | prod | `chat_backend` | `postgres://westfarn:<pw>@10.0.0.230:5432/chat_backend` |
+| chat_backend | beta | `chat_backend_beta` | `postgres://westfarn:<pw>@10.0.0.230:5432/chat_backend_beta` |
 
-Server prereqs on 10.0.0.230: create the 4 DBs + grant `westfarn`;
+Server prereqs on 10.0.0.230: create each DB + grant `westfarn`;
 `listen_addresses` covers LAN; `pg_hba.conf` allows `10.0.0.0/24`; firewall opens
 5432 to `10.0.0.0/24` only.
 
@@ -340,6 +368,9 @@ Store vault password for CI in a file readable only by the Act runner (e.g. `~/.
 | 8a | Auto-sync runner checkout on `master` (`.gitea/workflows/sync-checkout.yml`) | Done |
 | 9 | Stub `deploy-apps.yml` + update `company_site` workflow | Future |
 | 10 | Dockerize `company_site` | Future (separate ticket) |
+| 10a | Register + deploy `scha` (all webservers, port 8002) | In progress ([scha#19](https://git.aimloperations.com/ai_ml_operations/scha/issues/19)) |
+| 10b | Register + deploy `chat_web_app` (node-static, port 8082) | In progress ([chat_web_app#13](https://git.aimloperations.com/ai_ml_operations/chat_web_app/issues/13)) |
+| 10c | Register + deploy `chat_backend` (django, port 8003) | In progress ([chat_backend#6](https://git.aimloperations.com/ai_ml_operations/chat_backend/issues/6)) |
 | 11 | Gitea container registry (optional) | Future |
 
 ## Open Decisions

inventory/group_vars/all.yml

@@ -80,6 +80,29 @@ app_catalog:
     webroot_pattern: "/var/www/{env}.app.ditchtheagent/html"
     # deploy runs `npm ci` then `npm run build:<env>`; that script writes to
     # {{ web_static_root }}/<env>_dta_webapp (beta/prod), served by web-static.
+  scha:
+    type: django
+    repo: "{{ git_base_url }}/ai_ml_operations/scha.git"
+    default_branch: master
+    compose_file: docker-compose.prod.yml
+    web_service: web
+    migrate_cmd: "uv run python manage.py migrate --noinput"
+  chat_web_app:
+    type: node-static
+    repo: "{{ git_base_url }}/ai_ml_operations/chat_web_app.git"
+    default_branch: master
+    # package.json lives in this subdir of the checkout (npm runs here).
+    subdir: llm-fe
+    # Document root served by nginx and written by `npm run build:<env>`.
+    # {env} is replaced with the entry's env (beta/prod).
+    webroot_pattern: "/var/www/{env}.chat.aimloperations/html"
+  chat_backend:
+    type: django
+    repo: "{{ git_base_url }}/ai_ml_operations/chat_backend.git"
+    default_branch: master
+    compose_file: docker-compose.prod.yml
+    web_service: web
+    migrate_cmd: "uv run python manage.py migrate --noinput"
 
 # Deploy filter vars. CI passes these; manual runs may leave them undefined
 # to (re)deploy every app listed in the host's host_apps.

inventory/host_vars/adama.yml

@@ -10,3 +10,9 @@ host_apps:
   - { name: dta_service, env: beta, port: 8011 }
   - { name: dta_webapp, env: prod, port: 8080 }
   - { name: dta_webapp, env: beta, port: 8081 }
+  - { name: scha, env: prod, port: 8002 }
+  # optional: - { name: scha, env: beta, port: 8012 }
+  - { name: chat_web_app, env: prod, port: 8082 }
+  # optional: - { name: chat_web_app, env: beta, port: 8083 }
+  - { name: chat_backend, env: prod, port: 8003 }
+  # optional: - { name: chat_backend, env: beta, port: 8013 }

inventory/host_vars/ai-server-4080.yml

@@ -24,3 +24,8 @@ host_apps:
   - { name: dta_webapp, env: beta, port: 8081 }
   - { name: dta_service, env: prod, port: 8001 }
   - { name: dta_service, env: beta, port: 8011 }
+  - { name: scha, env: prod, port: 8002 }
+  - { name: chat_web_app, env: prod, port: 8082 }
+  # optional: - { name: chat_web_app, env: beta, port: 8083 }
+  - { name: chat_backend, env: prod, port: 8003 }
+  # optional: - { name: chat_backend, env: beta, port: 8013 }

inventory/host_vars/roslin.yml

@@ -7,3 +7,9 @@ host_apps:
   - { name: dta_service, env: beta, port: 8011 }
   - { name: dta_webapp, env: prod, port: 8080 }
   - { name: dta_webapp, env: beta, port: 8081 }
+  - { name: scha, env: prod, port: 8002 }
+  # optional: - { name: scha, env: beta, port: 8012 }
+  - { name: chat_web_app, env: prod, port: 8082 }
+  # optional: - { name: chat_web_app, env: beta, port: 8083 }
+  - { name: chat_backend, env: prod, port: 8003 }
+  # optional: - { name: chat_backend, env: beta, port: 8013 }

scripts/deploy.sh

@@ -17,7 +17,7 @@ Deploy applications with deploy-apps.yml.
   HOST              Optional. Limit to one host: adama, roslin, or ai-server-4080.
 
 Options:
-  --app NAME        App to deploy (company_site, dta_service, dta_webapp)
+  --app NAME        App to deploy (company_site, dta_service, dta_webapp, scha, chat_web_app, chat_backend)
   --env ENV         Environment: beta or prod
   --ref REF         Git ref/sha to deploy (default: master)
   --check           Dry run