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

@@ -194,6 +194,7 @@ After Docker install, re-SSH so the `docker` group membership takes effect.
 | `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 |
 
 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
@@ -217,6 +218,7 @@ future beta replica.
 | 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 |
 
@@ -259,6 +261,7 @@ point each domain at the backend(s):
 | 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)
 
@@ -273,6 +276,8 @@ point each domain at the backend(s):
 - [ ] `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)
 
 One shared instance; each app+env gets its own database (beta and prod MUST NOT
@@ -287,6 +292,8 @@ do not).
 | 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 each DB + grant `westfarn`;
 `listen_addresses` covers LAN; `pg_hba.conf` allows `10.0.0.0/24`; firewall opens
@@ -363,6 +370,7 @@ Store vault password for CI in a file readable only by the Act runner (e.g. `~/.
 | 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

@@ -96,6 +96,13 @@ app_catalog:
     # 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

@@ -14,3 +14,5 @@ host_apps:
   # 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

@@ -26,4 +26,6 @@ host_apps:
   - { 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 }
+  # 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

@@ -11,3 +11,5 @@ host_apps:
   # 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, scha, chat_web_app)
+  --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