Build container image in CI, bake in datasets, configure auth via env

- Dockerfile bakes the app and every CSV in data/ into an nginx image
- UI discovers data/*.csv via nginx JSON autoindex and offers a
  dropdown when there is more than one dataset
- docker-entrypoint.d/40-basic-auth.sh creates .htpasswd from
  BASIC_AUTH_USER / BASIC_AUTH_PASSWORD(_FILE) and refuses to start
  without credentials; replaces set-password.sh
- Gitea Actions workflow builds and pushes
  registry.traberph.de/public/interval_viz (latest, sha-*, semver)
- Escape resets the chart zoom

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.dockerignore

@@ -0,0 +1,7 @@
+*
+!Dockerfile
+!html/
+!data/
+!nginx/default.conf
+!nginx/security-headers.conf
+!docker-entrypoint.d/

.env.example

@@ -0,0 +1,3 @@
+BASIC_AUTH_USER=admin
+BASIC_AUTH_PASSWORD=change-me
+# HEATPUMP_PORT=8080

.gitea/workflows/docker.yml

@@ -0,0 +1,47 @@
+name: Build image
+
+on:
+  push:
+    branches: [main]
+    tags: ["v*"]
+  pull_request:
+  workflow_dispatch:
+
+env:
+  REGISTRY: registry.traberph.de
+  IMAGE: registry.traberph.de/public/interval_viz
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: docker/setup-buildx-action@v3
+
+      - name: Log in to registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.REGISTRY_USERNAME }}
+          password: ${{ secrets.REGISTRY_TOKEN }}
+
+      - name: Image tags
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.IMAGE }}
+          tags: |
+            type=raw,value=latest,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,format=short
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.gitignore

@@ -1,5 +1 @@
-# secrets
-nginx/.htpasswd
-# personal data export
-history.csv
 .env

Dockerfile

@@ -0,0 +1,11 @@
+FROM nginx:1.29-alpine
+
+COPY nginx/default.conf /etc/nginx/conf.d/default.conf
+COPY nginx/security-headers.conf /etc/nginx/security-headers.conf
+COPY --chmod=755 docker-entrypoint.d/40-basic-auth.sh /docker-entrypoint.d/
+COPY html /usr/share/nginx/html
+# every *.csv in data/ becomes selectable in the UI
+COPY data /usr/share/nginx/html/data
+
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 \
+    CMD wget -q -O /dev/null http://127.0.0.1/healthz || exit 1

README.md

@@ -1,51 +1,34 @@
 # Heatpump cycle analysis
 
 A small static web app that visualises when a heat pump compressor is running,
-based on a Home Assistant history export (`binary_sensor.*` on/off states).
+based on Home Assistant history exports (`binary_sensor.*` on/off states).
 
 - Interactive timeline (pan, zoom, mouse-wheel, quick ranges 6 h / 24 h / 3 d / 7 d)
 - Hover an on-phase to see its start, end and duration
 - Statistics for the visible range: number of phases, min / max / mean / median
   duration, total on-time, duty cycle, mean pause between phases
 - Table of all on-phases in the visible range
+- Several datasets, selectable from a dropdown
 - English / German UI (auto-detected from the browser, switchable, remembered)
 - Light / dark mode following the OS setting
-- Served by nginx in Docker, protected with HTTP basic auth; no external requests
+- nginx container with HTTP basic auth configured through environment variables;
-  (Plotly is vendored in `html/vendor/`)
+  no external requests (Plotly is vendored in `html/vendor/`)
 
-## Quick start
+## Data
 
-```sh
+Put CSV exports into `data/`. Every `*.csv` in there is baked into the image.
-# 1. put your export next to docker-compose.yml
-cp /path/to/export.csv history.csv
 
-# 2. create the login (prompts for the password)
+- **One file:** it is loaded directly.
-./set-password.sh admin
+- **Several files:** a dropdown in the header lists them alphabetically. The
+  most recently modified file (or the viewer's last choice) is preselected.
 
-# 3. start
+A different CSV can also be opened ad hoc with **Load CSV…**. It is parsed in
-docker compose up -d
+the browser and not uploaded.
-```
 
-Open <http://localhost:8080> and log in.
+The file list comes from nginx's JSON directory listing of `/data/`, so nothing
+has to be registered anywhere. Add or remove files and rebuild the image.
 
-> Run `set-password.sh` **before** the first `docker compose up`. If
+### CSV format
-> `nginx/.htpasswd` does not exist, Docker creates an empty directory in its
-> place and nginx rejects every login. The script removes that directory
-> automatically; restart the container afterwards.
-
-### Configuration
-
-Set via environment or a `.env` file next to `docker-compose.yml`:
-
-| Variable        | Default         | Meaning                           |
-|-----------------|-----------------|-----------------------------------|
-| `HEATPUMP_PORT` | `8080`          | Host port                         |
-| `HEATPUMP_CSV`  | `./history.csv` | CSV file served as `history.csv`  |
-
-Change the password with `./set-password.sh <user>` followed by
-`docker compose restart`. Replacing the CSV needs no restart; reload the page.
-
-## CSV format
 
 Home Assistant's history download (*History → ⋮ → Download data*):
 
@@ -55,9 +38,7 @@ binary_sensor.heatpump_compressor,on,2026-09-17T03:00:19.068Z
 binary_sensor.heatpump_compressor,off,2026-09-17T03:08:01.062Z
 ```
 
-Only the `state` and `last_changed` columns are used; column order doesn't
+Only the `state` and `last_changed` columns are used; column order doesn't matter.
-matter. A different CSV can also be opened ad hoc with **Load CSV…**. It is
-parsed in the browser and not uploaded.
 
 ### How phases are computed
 
@@ -69,38 +50,88 @@ parsed in the browser and not uploaded.
 - `unknown` / `unavailable` periods are shown as gaps in the timeline.
 - All times are shown in the browser's local time zone.
 
+## Container
+
+```sh
+docker build -t interval_viz .
+docker run -p 8080:80 -e BASIC_AUTH_USER=admin -e BASIC_AUTH_PASSWORD='…' interval_viz
+```
+
+| Variable                   | Meaning                                                        |
+|----------------------------|----------------------------------------------------------------|
+| `BASIC_AUTH_USER`          | Login name                                                     |
+| `BASIC_AUTH_PASSWORD`      | Password                                                       |
+| `BASIC_AUTH_PASSWORD_FILE` | Alternative to `BASIC_AUTH_PASSWORD`: path to a file holding it |
+
+At startup `docker-entrypoint.d/40-basic-auth.sh` writes `/etc/nginx/.htpasswd`
+(SHA-512 crypt). Without the variables, an `.htpasswd` mounted at that path is
+used instead. If neither is present, the container exits instead of serving
+the app without a password.
+
+- **Port:** 80 inside the container (plain HTTP). Terminate TLS in front of it,
+  since basic auth sends credentials in clear text.
+- **Health:** `GET /healthz` returns `ok` without auth. It is also the image's
+  `HEALTHCHECK`.
+
+### Local run with Compose
+
+```sh
+cp .env.example .env   # set BASIC_AUTH_USER / BASIC_AUTH_PASSWORD
+docker compose up -d --build
+```
+
+Open <http://localhost:8080> (port configurable with `HEATPUMP_PORT`).
+
+## CI: build and push
+
+`.gitea/workflows/docker.yml` builds the image with Gitea Actions and pushes it
+to the Harbor registry as `registry.traberph.de/public/interval_viz`.
+
+| Trigger            | Tags pushed                       |
+|--------------------|-----------------------------------|
+| push to `main`     | `latest`, `sha-<short>`           |
+| tag `v1.2.3`       | `1.2.3`, `1.2`, `sha-<short>`     |
+| pull request       | build only, nothing pushed        |
+| manual dispatch    | as for the selected ref           |
+
+Setup:
+
+1. Repository → Settings → Actions → **Secrets**:
+   - `REGISTRY_USERNAME`: a Harbor robot account with push permission on the
+     `public` project, e.g. `robot$public+interval_viz`
+   - `REGISTRY_TOKEN`: that robot account's secret
+2. A runner with Docker access must be registered for the repo, user or
+   instance (`act_runner` with the Docker socket mounted), and it must provide
+   the `ubuntu-latest` label.
+
 ## Project layout
 
 ```
-docker-compose.yml          nginx container, volumes, healthcheck
+Dockerfile                          image: nginx + app + data
-set-password.sh             writes nginx/.htpasswd (apr1 hash via openssl)
+docker-entrypoint.d/40-basic-auth.sh  creates .htpasswd from env at startup
-nginx/default.conf          basic auth, gzip, CSV alias, /healthz
+docker-compose.yml                  local build & run
+.gitea/workflows/docker.yml         CI: build & push image
+data/                               CSV files baked into the image
+nginx/default.conf                  basic auth, gzip, JSON listing of /data/, /healthz
 nginx/security-headers.conf         CSP and other headers, included per location
 html/index.html                     markup
 html/style.css                      styles (light/dark tokens)
 html/i18n.js                        English / German strings
-html/app.js                 CSV parsing, statistics, chart, UI wiring
+html/app.js                         dataset loading, CSV parsing, statistics, chart
 html/vendor/                        Plotly 2.35.2 + German locale
 ```
 
-`nginx/.htpasswd` and `history.csv` are git-ignored.
+## Maintenance
 
-## Operations
+**Updating Plotly:**
 
-- **Health:** `GET /healthz` (no auth) returns `ok`; used by the Docker
+```sh
-  healthcheck.
+v=2.35.2
-- **TLS:** the container serves plain HTTP. Basic auth sends credentials in
+curl -fLo html/vendor/plotly.min.js       https://cdn.jsdelivr.net/npm/plotly.js-dist-min@$v/plotly.min.js
-  clear text, so outside a trusted LAN put it behind a TLS-terminating reverse
+curl -fLo html/vendor/plotly-locale-de.js https://cdn.jsdelivr.net/npm/plotly.js@$v/dist/plotly-locale-de.js
-  proxy (Traefik, Caddy, nginx, …).
+```
-- **Updating Plotly:**
-  ```sh
-  v=2.35.2
-  curl -fLo html/vendor/plotly.min.js        https://cdn.jsdelivr.net/npm/plotly.js-dist-min@$v/plotly.min.js
-  curl -fLo html/vendor/plotly-locale-de.js  https://cdn.jsdelivr.net/npm/plotly.js@$v/dist/plotly-locale-de.js
-  ```
 
-## Adding a language
+**Adding a language:** add an entry to `I18N` in `html/i18n.js` (copy `en`,
-
+translate, set `locale`) and a `<button data-lang="xx">` in `index.html`. For
-Add an entry to `I18N` in `html/i18n.js` (copy `en`, translate, set `locale`),
+translated chart controls, also vendor `plotly-locale-xx.js` and include it in
-add a `<button data-lang="xx">` in `index.html`, and, for translated chart
+`index.html`.
-controls, vendor `plotly-locale-xx.js` and include it in `index.html`.

data/history.csv

@@ -0,0 +1,71 @@
+entity_id,state,last_changed
+binary_sensor.heatpump_compressor,on,2026-09-17T03:00:19.068Z
+binary_sensor.heatpump_compressor,off,2026-09-17T03:08:01.062Z
+binary_sensor.heatpump_compressor,on,2026-09-17T11:26:17.041Z
+binary_sensor.heatpump_compressor,off,2026-09-17T11:41:03.220Z
+binary_sensor.heatpump_compressor,on,2026-09-18T03:00:22.102Z
+binary_sensor.heatpump_compressor,off,2026-09-18T03:19:35.943Z
+binary_sensor.heatpump_compressor,on,2026-09-18T10:19:43.304Z
+binary_sensor.heatpump_compressor,off,2026-09-18T10:36:39.042Z
+binary_sensor.heatpump_compressor,on,2026-09-19T01:20:46.148Z
+binary_sensor.heatpump_compressor,off,2026-09-19T01:22:54.097Z
+binary_sensor.heatpump_compressor,on,2026-09-19T02:22:51.267Z
+binary_sensor.heatpump_compressor,off,2026-09-19T02:28:06.281Z
+binary_sensor.heatpump_compressor,on,2026-09-19T03:28:40.219Z
+binary_sensor.heatpump_compressor,off,2026-09-19T03:35:46.221Z
+binary_sensor.heatpump_compressor,on,2026-09-19T04:41:58.300Z
+binary_sensor.heatpump_compressor,off,2026-09-19T04:49:50.417Z
+binary_sensor.heatpump_compressor,on,2026-09-19T05:57:54.487Z
+binary_sensor.heatpump_compressor,off,2026-09-19T06:43:11.390Z
+binary_sensor.heatpump_compressor,on,2026-09-19T09:12:49.606Z
+binary_sensor.heatpump_compressor,off,2026-09-19T09:29:53.590Z
+binary_sensor.heatpump_compressor,on,2026-09-20T03:39:39.610Z
+binary_sensor.heatpump_compressor,off,2026-09-20T03:42:03.650Z
+binary_sensor.heatpump_compressor,on,2026-09-20T04:41:55.897Z
+binary_sensor.heatpump_compressor,off,2026-09-20T04:47:38.833Z
+binary_sensor.heatpump_compressor,on,2026-09-20T05:48:38.700Z
+binary_sensor.heatpump_compressor,off,2026-09-20T05:55:45.486Z
+binary_sensor.heatpump_compressor,on,2026-09-20T06:00:23.429Z
+binary_sensor.heatpump_compressor,off,2026-09-20T06:36:28.105Z
+binary_sensor.heatpump_compressor,on,2026-09-20T09:50:15.244Z
+binary_sensor.heatpump_compressor,off,2026-09-20T10:01:52.926Z
+binary_sensor.heatpump_compressor,on,2026-09-21T03:00:04.587Z
+binary_sensor.heatpump_compressor,off,2026-09-21T03:05:11.361Z
+binary_sensor.heatpump_compressor,unknown,2026-09-21T08:18:28.438Z
+binary_sensor.heatpump_compressor,off,2026-09-21T08:18:30.643Z
+binary_sensor.heatpump_compressor,on,2026-09-22T03:00:05.235Z
+binary_sensor.heatpump_compressor,off,2026-09-22T03:20:51.957Z
+binary_sensor.heatpump_compressor,on,2026-09-22T09:45:24.980Z
+binary_sensor.heatpump_compressor,off,2026-09-22T10:05:30.687Z
+binary_sensor.heatpump_compressor,on,2026-09-23T03:00:08.414Z
+binary_sensor.heatpump_compressor,off,2026-09-23T03:12:46.457Z
+binary_sensor.heatpump_compressor,on,2026-09-23T09:45:29.000Z
+binary_sensor.heatpump_compressor,off,2026-09-23T10:04:03.857Z
+binary_sensor.heatpump_compressor,on,2026-09-24T03:00:09.997Z
+binary_sensor.heatpump_compressor,off,2026-09-24T03:11:26.925Z
+binary_sensor.heatpump_compressor,on,2026-09-24T12:34:34.499Z
+binary_sensor.heatpump_compressor,off,2026-09-24T13:05:30.499Z
+binary_sensor.heatpump_compressor,on,2026-09-25T03:00:07.285Z
+binary_sensor.heatpump_compressor,off,2026-09-25T03:39:07.324Z
+binary_sensor.heatpump_compressor,unknown,2026-09-25T08:35:58.362Z
+binary_sensor.heatpump_compressor,off,2026-09-25T08:36:05.755Z
+binary_sensor.heatpump_compressor,unknown,2026-09-25T08:36:57.698Z
+binary_sensor.heatpump_compressor,off,2026-09-25T08:36:58.846Z
+binary_sensor.heatpump_compressor,unknown,2026-09-25T08:41:12.345Z
+binary_sensor.heatpump_compressor,off,2026-09-25T08:41:15.133Z
+binary_sensor.heatpump_compressor,on,2026-09-25T09:28:41.719Z
+binary_sensor.heatpump_compressor,off,2026-09-25T09:54:51.506Z
+binary_sensor.heatpump_compressor,on,2026-09-26T00:42:45.260Z
+binary_sensor.heatpump_compressor,off,2026-09-26T00:44:28.166Z
+binary_sensor.heatpump_compressor,on,2026-09-26T01:18:30.843Z
+binary_sensor.heatpump_compressor,off,2026-09-26T01:23:43.918Z
+binary_sensor.heatpump_compressor,on,2026-09-26T02:10:50.330Z
+binary_sensor.heatpump_compressor,off,2026-09-26T02:18:56.282Z
+binary_sensor.heatpump_compressor,on,2026-09-26T03:08:29.828Z
+binary_sensor.heatpump_compressor,off,2026-09-26T03:17:03.786Z
+binary_sensor.heatpump_compressor,on,2026-09-26T04:07:50.486Z
+binary_sensor.heatpump_compressor,off,2026-09-26T04:17:22.353Z
+binary_sensor.heatpump_compressor,on,2026-09-26T05:06:08.060Z
+binary_sensor.heatpump_compressor,off,2026-09-26T05:16:05.238Z
+binary_sensor.heatpump_compressor,on,2026-09-26T06:00:08.484Z
+binary_sensor.heatpump_compressor,off,2026-09-26T06:37:50.037Z

data/history2.csv

@@ -0,0 +1,71 @@
+entity_id,state,last_changed
+binary_sensor.heatpump_compressor,on,2026-09-17T03:00:19.068Z
+binary_sensor.heatpump_compressor,off,2026-09-17T03:08:01.062Z
+binary_sensor.heatpump_compressor,on,2026-09-17T11:26:17.041Z
+binary_sensor.heatpump_compressor,off,2026-09-17T11:41:03.220Z
+binary_sensor.heatpump_compressor,on,2026-09-18T03:00:22.102Z
+binary_sensor.heatpump_compressor,off,2026-09-18T03:19:35.943Z
+binary_sensor.heatpump_compressor,on,2026-09-18T10:19:43.304Z
+binary_sensor.heatpump_compressor,off,2026-09-18T10:36:39.042Z
+binary_sensor.heatpump_compressor,on,2026-09-19T01:20:46.148Z
+binary_sensor.heatpump_compressor,off,2026-09-19T01:22:54.097Z
+binary_sensor.heatpump_compressor,on,2026-09-19T02:22:51.267Z
+binary_sensor.heatpump_compressor,off,2026-09-19T02:28:06.281Z
+binary_sensor.heatpump_compressor,on,2026-09-19T03:28:40.219Z
+binary_sensor.heatpump_compressor,off,2026-09-19T03:35:46.221Z
+binary_sensor.heatpump_compressor,on,2026-09-19T04:41:58.300Z
+binary_sensor.heatpump_compressor,off,2026-09-19T04:49:50.417Z
+binary_sensor.heatpump_compressor,on,2026-09-19T05:57:54.487Z
+binary_sensor.heatpump_compressor,off,2026-09-19T06:43:11.390Z
+binary_sensor.heatpump_compressor,on,2026-09-19T09:12:49.606Z
+binary_sensor.heatpump_compressor,off,2026-09-19T09:29:53.590Z
+binary_sensor.heatpump_compressor,on,2026-09-20T03:39:39.610Z
+binary_sensor.heatpump_compressor,off,2026-09-20T03:42:03.650Z
+binary_sensor.heatpump_compressor,on,2026-09-20T04:41:55.897Z
+binary_sensor.heatpump_compressor,off,2026-09-20T04:47:38.833Z
+binary_sensor.heatpump_compressor,on,2026-09-20T05:48:38.700Z
+binary_sensor.heatpump_compressor,off,2026-09-20T05:55:45.486Z
+binary_sensor.heatpump_compressor,on,2026-09-20T06:00:23.429Z
+binary_sensor.heatpump_compressor,off,2026-09-20T06:36:28.105Z
+binary_sensor.heatpump_compressor,on,2026-09-20T09:50:15.244Z
+binary_sensor.heatpump_compressor,off,2026-09-20T10:01:52.926Z
+binary_sensor.heatpump_compressor,on,2026-09-21T03:00:04.587Z
+binary_sensor.heatpump_compressor,off,2026-09-21T03:05:11.361Z
+binary_sensor.heatpump_compressor,unknown,2026-09-21T08:18:28.438Z
+binary_sensor.heatpump_compressor,off,2026-09-21T08:18:30.643Z
+binary_sensor.heatpump_compressor,on,2026-09-22T03:00:05.235Z
+binary_sensor.heatpump_compressor,off,2026-09-22T03:20:51.957Z
+binary_sensor.heatpump_compressor,on,2026-09-22T09:45:24.980Z
+binary_sensor.heatpump_compressor,off,2026-09-22T10:05:30.687Z
+binary_sensor.heatpump_compressor,on,2026-09-23T03:00:08.414Z
+binary_sensor.heatpump_compressor,off,2026-09-23T03:12:46.457Z
+binary_sensor.heatpump_compressor,on,2026-09-23T09:45:29.000Z
+binary_sensor.heatpump_compressor,off,2026-09-23T10:04:03.857Z
+binary_sensor.heatpump_compressor,on,2026-09-24T03:00:09.997Z
+binary_sensor.heatpump_compressor,off,2026-09-24T03:11:26.925Z
+binary_sensor.heatpump_compressor,on,2026-09-24T12:34:34.499Z
+binary_sensor.heatpump_compressor,off,2026-09-24T13:05:30.499Z
+binary_sensor.heatpump_compressor,on,2026-09-25T03:00:07.285Z
+binary_sensor.heatpump_compressor,off,2026-09-25T03:39:07.324Z
+binary_sensor.heatpump_compressor,unknown,2026-09-25T08:35:58.362Z
+binary_sensor.heatpump_compressor,off,2026-09-25T08:36:05.755Z
+binary_sensor.heatpump_compressor,unknown,2026-09-25T08:36:57.698Z
+binary_sensor.heatpump_compressor,off,2026-09-25T08:36:58.846Z
+binary_sensor.heatpump_compressor,unknown,2026-09-25T08:41:12.345Z
+binary_sensor.heatpump_compressor,off,2026-09-25T08:41:15.133Z
+binary_sensor.heatpump_compressor,on,2026-09-25T09:28:41.719Z
+binary_sensor.heatpump_compressor,off,2026-09-25T09:54:51.506Z
+binary_sensor.heatpump_compressor,on,2026-09-26T00:42:45.260Z
+binary_sensor.heatpump_compressor,off,2026-09-26T00:44:28.166Z
+binary_sensor.heatpump_compressor,on,2026-09-26T01:18:30.843Z
+binary_sensor.heatpump_compressor,off,2026-09-26T01:23:43.918Z
+binary_sensor.heatpump_compressor,on,2026-09-26T02:10:50.330Z
+binary_sensor.heatpump_compressor,off,2026-09-26T02:18:56.282Z
+binary_sensor.heatpump_compressor,on,2026-09-26T03:08:29.828Z
+binary_sensor.heatpump_compressor,off,2026-09-26T03:17:03.786Z
+binary_sensor.heatpump_compressor,on,2026-09-26T04:07:50.486Z
+binary_sensor.heatpump_compressor,off,2026-09-26T04:17:22.353Z
+binary_sensor.heatpump_compressor,on,2026-09-26T05:06:08.060Z
+binary_sensor.heatpump_compressor,off,2026-09-26T05:16:05.238Z
+binary_sensor.heatpump_compressor,on,2026-09-26T06:00:08.484Z
+binary_sensor.heatpump_compressor,off,2026-09-26T06:37:50.037Z

docker-compose.yml

@@ -1,17 +1,10 @@
 services:
   heatpump:
-    image: nginx:1.29-alpine
+    build: .
+    image: registry.traberph.de/public/interval_viz:latest
     restart: unless-stopped
     ports:
       - "${HEATPUMP_PORT:-8080}:80"
-    volumes:
+    environment:
-      - ./html:/usr/share/nginx/html:ro
+      BASIC_AUTH_USER: dev
-      - ${HEATPUMP_CSV:-./history.csv}:/data/history.csv:ro
+      BASIC_AUTH_PASSWORD: dev
-      - ./nginx/default.conf:/etc/nginx/conf.d/default.conf:ro
-      - ./nginx/security-headers.conf:/etc/nginx/security-headers.conf:ro
-      - ./nginx/.htpasswd:/etc/nginx/.htpasswd:ro
-    healthcheck:
-      test: ["CMD", "wget", "-q", "-O", "/dev/null", "http://127.0.0.1/healthz"]
-      interval: 30s
-      timeout: 5s
-      retries: 3

docker-entrypoint.d/40-basic-auth.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+# Creates the basic-auth file for nginx from environment variables.
+#
+#   BASIC_AUTH_USER            user name
+#   BASIC_AUTH_PASSWORD        password, or
+#   BASIC_AUTH_PASSWORD_FILE   path to a file containing the password (e.g. a mounted secret)
+#
+# Without these variables an already mounted /etc/nginx/.htpasswd is used.
+# If neither exists the container refuses to start, so the app is never served unprotected.
+set -eu
+
+HTPASSWD=/etc/nginx/.htpasswd
+ME=$(basename "$0")
+
+if [ -n "${BASIC_AUTH_PASSWORD_FILE:-}" ]; then
+    [ -r "$BASIC_AUTH_PASSWORD_FILE" ] || { echo "$ME: cannot read $BASIC_AUTH_PASSWORD_FILE" >&2; exit 1; }
+    BASIC_AUTH_PASSWORD=$(cat "$BASIC_AUTH_PASSWORD_FILE")
+fi
+
+if [ -n "${BASIC_AUTH_USER:-}" ] || [ -n "${BASIC_AUTH_PASSWORD:-}" ]; then
+    : "${BASIC_AUTH_USER:?$ME: BASIC_AUTH_USER is not set}"
+    : "${BASIC_AUTH_PASSWORD:?$ME: BASIC_AUTH_PASSWORD is empty}"
+    case "$BASIC_AUTH_USER" in *:*) echo "$ME: BASIC_AUTH_USER must not contain ':'" >&2; exit 1 ;; esac
+
+    # SHA-512 crypt; password is passed on stdin so it never shows up in the process list
+    hash=$(printf '%s' "$BASIC_AUTH_PASSWORD" | mkpasswd -m sha512 -P 0)
+    printf '%s:%s\n' "$BASIC_AUTH_USER" "$hash" > "$HTPASSWD"
+    chmod 644 "$HTPASSWD"
+    echo "$ME: basic auth configured for user '$BASIC_AUTH_USER'"
+elif [ -s "$HTPASSWD" ]; then
+    echo "$ME: using existing $HTPASSWD"
+else
+    echo "$ME: no credentials - set BASIC_AUTH_USER and BASIC_AUTH_PASSWORD (or mount $HTPASSWD)" >&2
+    exit 1
+fi

html/app.js

@@ -1,6 +1,8 @@
 'use strict';
 
 const LANG_KEY = 'heatpump.lang';
+const DATASET_KEY = 'heatpump.dataset';
+const DATA_DIR = 'data/';
 const HOUR = 3600e3;
 
 const state = {
@@ -10,7 +12,9 @@ const state = {
   dataMin: 0,
   dataMax: 0,
   range: null,      // [from, to] in ms, or null = everything
-  source: '',
+  datasets: [],     // CSV file names in data/
+  source: '',       // name of the loaded dataset or local file
+  localFile: false, // source was opened via "Load CSV…"
   error: null,      // { key, params } so it can be re-rendered on language change
 };
 
@@ -42,6 +46,7 @@ function setLang(lang) {
     if (el.dataset.i18n === 'note') el.innerHTML = t('note');
     else el.textContent = t(el.dataset.i18n);
   });
+  $('dataset').setAttribute('aria-label', t('dataset'));
   document.querySelectorAll('[data-lang]').forEach(b => b.setAttribute('aria-pressed', String(b.dataset.lang === lang)));
   render();
 }
@@ -119,11 +124,11 @@ function parseCsv(text) {
   return { events, phases };
 }
 
-function load(text, source) {
+function load(text, source, localFile = false) {
   try {
     const { events, phases } = parseCsv(text);
     Object.assign(state, {
-      events, phases, source, error: null, range: null,
+      events, phases, source, localFile, error: null, range: null,
       dataMin: events[0].t, dataMax: events[events.length - 1].t,
     });
   } catch (err) {
@@ -157,12 +162,14 @@ const tilesHtml = tiles => tiles.map(([key, value, cls = '']) =>
   `<div class="tile"><div class="k">${escapeHtml(t(key))}</div><div class="v ${cls}">${escapeHtml(value)}</div></div>`).join('');
 
 function render() {
+  renderDatasetSelect();
   const src = $('source');
   if (state.error) {
     src.textContent = t(state.error.key, state.error.params);
     src.className = 'sub error';
   } else {
-    src.textContent = state.source || t('loading');
+    // with a dropdown the selected entry already names the source
+    src.textContent = $('dataset').hidden ? state.source || t('loading') : '';
     src.className = 'sub';
   }
   if (!state.events.length) return;
@@ -178,6 +185,17 @@ function render() {
   renderStats();
 }
 
+function renderDatasetSelect() {
+  const select = $('dataset');
+  select.hidden = state.datasets.length < 2;
+  if (select.hidden) return;
+  const option = (value, label, extra = '') =>
+    `<option value="${escapeHtml(value)}"${extra}>${escapeHtml(label)}</option>`;
+  select.innerHTML = state.datasets.map(name => option(name, name)).join('') +
+    (state.localFile ? option('', `${t('localFile')}: ${state.source}`, ' disabled') : '');
+  select.value = state.localFile ? '' : state.source;
+}
+
 function drawChart() {
   const accent = css('--accent'), ink = css('--ink'), ink2 = css('--ink-2'), line = css('--line');
 
@@ -283,20 +301,58 @@ document.querySelectorAll('[data-span]').forEach(btn => btn.addEventListener('cl
 $('file').addEventListener('change', async e => {
   const file = e.target.files[0];
   e.target.value = '';  // allow re-selecting the same file
-  if (file) load(await file.text(), file.name);
+  if (file) load(await file.text(), file.name, true);
+});
+
+// Escape resets the zoom, like a double-click in the chart
+document.addEventListener('keydown', e => {
+  if (e.key !== 'Escape' || e.defaultPrevented || !state.range) return;
+  if (e.target.closest('select, input')) return;  // let open controls handle their own Escape
+  setRange(null);
 });
 
 matchMedia('(prefers-color-scheme: dark)').addEventListener('change', render);
 
-setLang(detectLang());
+$('dataset').addEventListener('change', e => loadDataset(e.target.value));
 
-fetch('history.csv', { cache: 'no-cache' })
+async function loadDataset(name) {
-  .then(r => {
+  try {
+    const r = await fetch(DATA_DIR + encodeURIComponent(name), { cache: 'no-cache' });
     if (!r.ok) throw new Error(`HTTP ${r.status}`);
-    return r.text();
+    load(await r.text(), name);
-  })
+    // remember only selections that actually loaded
-  .then(text => load(text, 'history.csv'))
+    if (!state.error) try { localStorage.setItem(DATASET_KEY, name); } catch { /* storage unavailable */ }
-  .catch(err => {
+  } catch (err) {
-    state.error = { key: 'errFetch', params: { status: err.message } };
+    state.error = { key: 'errFetch', params: { file: name, status: err.message } };
     render();
-  });
+  }
+}
+
+// data/ is served as an nginx JSON directory listing: [{ name, type, mtime, size }, …]
+async function init() {
+  setLang(detectLang());
+  let files = [];
+  try {
+    const r = await fetch(DATA_DIR, { cache: 'no-cache' });
+    if (!r.ok) throw new Error(`HTTP ${r.status}`);
+    files = (await r.json())
+      .filter(f => f.type === 'file' && /\.csv$/i.test(f.name))
+      .sort((a, b) => a.name.localeCompare(b.name));
+  } catch (err) {
+    state.error = { key: 'errFetch', params: { file: DATA_DIR, status: err.message } };
+    return render();
+  }
+  if (!files.length) {
+    state.error = { key: 'errNoData' };
+    return render();
+  }
+  state.datasets = files.map(f => f.name);
+
+  // last selection if still present, otherwise the most recently modified file
+  let saved = null;
+  try { saved = localStorage.getItem(DATASET_KEY); } catch { /* storage unavailable */ }
+  const newest = files.reduce((a, b) => Date.parse(b.mtime) > Date.parse(a.mtime) ? b : a);
+  loadDataset(state.datasets.includes(saved) ? saved : newest.name);
+}
+
+init();

html/i18n.js

@@ -33,9 +33,12 @@ const I18N = {
     units: { d: 'd', h: 'h', m: 'm', s: 's' },
     errColumns: 'CSV needs the columns "state" and "last_changed".',
     errEmpty: 'CSV contains no valid rows.',
-    errFetch: 'Could not load history.csv ({status}) – use “Load CSV…”.',
+    dataset: 'Dataset',
+    localFile: 'Local file',
+    errFetch: 'Could not load {file} ({status}) – use “Load CSV…”.',
+    errNoData: 'No CSV files found in data/ – use “Load CSV…”.',
     note: 'Hover a phase to see its duration. Drag to zoom, shift+drag or the pan tool to pan, ' +
-      'mouse wheel to zoom, double-click to reset. Statistics use the on-phases that <em>start</em> ' +
+      'mouse wheel to zoom, double-click or Esc to reset. Statistics use the on-phases that <em>start</em> ' +
       'within the visible range; total on-time and duty cycle are clipped to the range. ' +
       'A phase ends at the first state that is not "on" (off, unknown, unavailable); ' +
       'a phase still running at the end of the data is excluded. Times are shown in your local time zone.',
@@ -71,9 +74,12 @@ const I18N = {
     units: { d: 'T', h: 'h', m: 'min', s: 's' },
     errColumns: 'Die CSV benötigt die Spalten "state" und "last_changed".',
     errEmpty: 'Die CSV enthält keine gültigen Zeilen.',
-    errFetch: 'history.csv konnte nicht geladen werden ({status}) – bitte „CSV laden…“ verwenden.',
+    dataset: 'Datensatz',
+    localFile: 'Lokale Datei',
+    errFetch: '{file} konnte nicht geladen werden ({status}) – bitte „CSV laden…“ verwenden.',
+    errNoData: 'Keine CSV-Dateien in data/ gefunden – bitte „CSV laden…“ verwenden.',
     note: 'Für die Dauer über eine Phase fahren. Ziehen zum Zoomen, Umschalt+Ziehen oder das Verschieben-Werkzeug ' +
-      'zum Verschieben, Mausrad zum Zoomen, Doppelklick zum Zurücksetzen. Die Statistik berücksichtigt Laufphasen, ' +
+      'zum Verschieben, Mausrad zum Zoomen, Doppelklick oder Esc zum Zurücksetzen. Die Statistik berücksichtigt Laufphasen, ' +
       'die im sichtbaren Zeitraum <em>beginnen</em>; Laufzeit gesamt und Einschaltanteil werden auf den Zeitraum begrenzt. ' +
       'Eine Phase endet beim ersten Zustand ungleich „on“ (off, unknown, unavailable); ' +
       'eine am Datenende noch laufende Phase wird nicht gezählt. Zeiten in lokaler Zeitzone.',

html/index.html

@@ -15,7 +15,8 @@
   <header>
     <h1 data-i18n="title">Heatpump compressor cycles</h1>
     <div class="header-right">
-      <span class="sub" id="source" data-i18n="loading">loading…</span>
+      <select id="dataset" hidden aria-label="Dataset"></select>
+      <span class="sub" id="source"></span>
       <div class="lang" role="group" aria-label="Language">
         <button type="button" data-lang="en">EN</button>
         <button type="button" data-lang="de">DE</button>

html/style.css

@@ -26,11 +26,11 @@ h2 {
 .sub { color: var(--ink-2); font-size: 13px; }
 .error { color: var(--error); }
 
-button, label.file {
+button, label.file, select {
   font: inherit; font-size: 13px; padding: 5px 11px; border-radius: 6px; cursor: pointer;
   border: 1px solid var(--line); background: var(--surface); color: var(--ink);
 }
-button:hover, label.file:hover { border-color: var(--accent); }
+button:hover, label.file:hover, select:hover { border-color: var(--accent); }
 label.file:focus-within { outline: 2px solid var(--accent); outline-offset: 1px; }
 label.file input { position: absolute; opacity: 0; width: 1px; height: 1px; }
 

nginx/default.conf

@@ -9,7 +9,7 @@ server {
 
     gzip on;
     gzip_comp_level 6;
-    gzip_types text/css text/csv application/javascript;
+    gzip_types text/css text/csv application/javascript application/json;
 
     auth_basic "Heatpump";
     auth_basic_user_file /etc/nginx/.htpasswd;
@@ -19,9 +19,10 @@ server {
         include /etc/nginx/security-headers.conf;
     }
 
-    # the CSV is mounted separately so it can be replaced without touching the app
+    # data/ is listed as JSON so the UI can discover the CSV files
-    location = /history.csv {
+    location /data/ {
-        alias /data/history.csv;
+        autoindex on;
+        autoindex_format json;
         default_type text/csv;
         include /etc/nginx/security-headers.conf;
     }

set-password.sh

@@ -1,20 +0,0 @@
-#!/bin/sh
-# Creates nginx/.htpasswd for HTTP basic auth.
-# Usage: ./set-password.sh <user> [password]    (prompts for the password if omitted)
-set -eu
-
-user="${1:?usage: $0 <user> [password]}"
-case "$user" in *:*) echo "user name must not contain ':'" >&2; exit 1 ;; esac
-
-if [ $# -ge 2 ]; then
-    hash=$(openssl passwd -apr1 "$2")
-else
-    hash=$(openssl passwd -apr1)
-fi
-
-file="$(dirname "$0")/nginx/.htpasswd"
-[ -d "$file" ] && rmdir "$file"   # docker creates a directory if the file was missing on first start
-umask 077
-printf '%s:%s\n' "$user" "$hash" > "$file"
-chmod 644 "$file"                 # nginx workers must be able to read it
-echo "Wrote $file for user '$user'. Run 'docker compose restart' if the container is already running."