Keep the database in ./data and bind-mount it

SQLite writes three files — the database plus its -wal and -shm companions.
Putting them in one directory means a deployment mounts a single path and a
backup copies a single directory.

- FOODSTER_DB defaults to ./data/foodster.db, and openDB creates the parent
  directory on startup rather than failing on a fresh checkout
- compose bind-mounts ./data instead of using a named volume, so the file can
  be listed, copied and opened with any sqlite client without going through
  the container engine
- the image runs as UID 65534, which cannot write to a host directory owned
  by someone else, so compose now sets user: from FOODSTER_UID/FOODSTER_GID
- `make up` creates ./data first: left to the engine it appears root-owned
  and the app silently cannot write to it

.env.example

@@ -11,6 +11,12 @@ FOODSTER_PASSWORD=changeme
 # Host port to publish on.
 FOODSTER_PORT=8080
 
+# The database lives in ./data, bind-mounted into the container. These must
+# match whoever owns that directory on the host, or the container cannot
+# write to it. `id -u` and `id -g` will tell you.
+FOODSTER_UID=1000
+FOODSTER_GID=1000
+
 # Used for every calendar-day calculation. Set it in development too: under
 # UTC the date rolls over three hours late, which is exactly when dinner
 # gets logged.

.gitignore

@@ -7,7 +7,8 @@
 # Generated by `templ generate` during the container build.
 *_templ.go
 
-# Local database
+# The database and its SQLite companions.
+/data/
 *.db
 *.db-shm
 *.db-wal

Makefile

@@ -31,10 +31,8 @@ build: generate ## Build ./foodster
 	CGO_ENABLED=0 go build -trimpath \
 		-ldflags="-s -w -X main.version=dev" -o $(BIN) $(PKG)
 
-run: generate ## Run locally on :8080
-	FOODSTER_PASSWORD=$${FOODSTER_PASSWORD:-dev} \
-	FOODSTER_DB=$${FOODSTER_DB:-./foodster.db} \
-	go run $(PKG)
+run: generate ## Run locally on :8080 (database in ./data)
+	FOODSTER_PASSWORD=$${FOODSTER_PASSWORD:-dev} go run $(PKG)
 
 seed: ## Import a dish bundle (SEED=seeds/testi.json)
 	go run $(PKG) -import $(SEED)
@@ -84,6 +82,7 @@ push: ## Push the newest tag and :latest
 release: image push ## Build, tag and push in one go
 
 up: ## Start the stack
+	@mkdir -p data   # or the engine creates it root-owned and the app cannot write
 	$(COMPOSE) up -d
 
 down: ## Stop the stack

PRD.md

@@ -342,13 +342,19 @@ on the server and run with Docker Compose.
   static binary; the runtime stage is `FROM scratch` holding only that
   binary, running as UID 65534.
 - **Compose**: a single service. No database container — SQLite lives at
-  `/data/foodster.db` on a named volume. `restart: unless-stopped`.
+  `/data/foodster.db`, bind-mounted from `./data` on the host rather than
+  kept in a named volume, so the file can be listed and copied without going
+  through the container engine. Backup is `cp -r data`. Because the image
+  runs as UID 65534, compose sets `user:` from `FOODSTER_UID`/`FOODSTER_GID`
+  to match whoever owns that directory. `restart: unless-stopped`.
 - **Configuration**, entirely through environment variables (see
   `.env.example`):
   - `FOODSTER_REPO` and `FOODSTER_TAG` — image coordinates.
   - `FOODSTER_PASSWORD` — the shared password. Required; the app refuses to
     start without it.
-  - `FOODSTER_DB` — database file path, default `/data/foodster.db`.
+  - `FOODSTER_DB` — database file path, default `./data/foodster.db`. The
+    directory is created on startup if missing.
+  - `FOODSTER_UID` / `FOODSTER_GID` — host owner of `./data`.
   - `TZ` — default `Europe/Helsinki`.
 - The registry hostname exists only in `.env`, which is gitignored, because
   §11 leaves open the possibility of publishing this repository.

README.md

@@ -105,7 +105,8 @@ Everything is environment variables. `.env` is gitignored; start from
 | Variable | Default | Purpose |
 |---|---|---|
 | `FOODSTER_PASSWORD` | *required* | Shared password. The app will not start without it. |
-| `FOODSTER_DB` | `/data/foodster.db` | SQLite file path. |
+| `FOODSTER_DB` | `./data/foodster.db` | SQLite file path; the directory is created if missing. |
+| `FOODSTER_UID` / `FOODSTER_GID` | `1000` | Host owner of `./data`, for the bind mount. |
 | `TZ` | `Europe/Helsinki` | Used for every calendar-day calculation. |
 | `FOODSTER_REPO` | *required to build* | Image repository, no tag. |
 | `FOODSTER_TAG` | `latest` | Tag to run under compose. |
@@ -129,8 +130,13 @@ Versions are CalVer — `vYYYYMMDD-N`, where `N` is the Nth build that day. The
 running version is served at `GET /healthz`, which is the one route outside
 authentication.
 
-There is no database container. SQLite lives on a named volume, so a backup
-is a file copy.
+There is no database container. SQLite lives in `./data`, bind-mounted into
+the container, so a backup is `cp -r data` and you can inspect the file with
+any sqlite client without going through the engine.
+
+That directory must exist and be owned by the user compose runs as — `make up`
+creates it, and `FOODSTER_UID`/`FOODSTER_GID` in `.env` tell the container who
+that is. Get them from `id -u` and `id -g`.
 
 ## Security
 

cmd/foodster/main.go

@@ -18,6 +18,7 @@ import (
 	"net/http"
 	"os"
 	"os/signal"
+	"path/filepath"
 	"strings"
 	"syscall"
 	"time"
@@ -36,7 +37,10 @@ var version = "dev"
 const (
 	listenAddr = ":8080"
 	defaultTZ  = "Europe/Helsinki"
-	defaultDB  = "./foodster.db"
+	// Everything SQLite writes — the database plus its -wal and -shm
+	// companions — lives in one directory, so a deployment mounts a single
+	// path and a backup copies a single directory.
+	defaultDB = "./data/foodster.db"
 
 	// failDelay throttles password guessing.
 	// ponytail: a fixed sleep is enough for a LAN-only app; swap in
@@ -108,6 +112,12 @@ func run() error {
 
 // openDB opens the SQLite file and brings its schema up to date.
 func openDB(path string) (*sql.DB, error) {
+	if dir := filepath.Dir(path); dir != "." && dir != "" {
+		if err := os.MkdirAll(dir, 0o755); err != nil {
+			return nil, fmt.Errorf("create %s: %w", dir, err)
+		}
+	}
+
 	dsn := "file:" + path +
 		"?_pragma=journal_mode(WAL)" +
 		"&_pragma=foreign_keys(ON)" +

compose.yaml

@@ -2,6 +2,11 @@ services:
   app:
     image: ${FOODSTER_REPO:?set FOODSTER_REPO in .env}:${FOODSTER_TAG:-latest}
     restart: unless-stopped
+    # A bind mount rather than a named volume: the database sits in ./data on
+    # the host, where it can be listed, copied and backed up without going
+    # through the container engine. The image runs as UID 65534, so the
+    # container has to be told which host user owns that directory.
+    user: "${FOODSTER_UID:-1000}:${FOODSTER_GID:-1000}"
     ports:
       - "${FOODSTER_PORT:-8080}:8080"
     environment:
@@ -9,7 +14,4 @@ services:
       FOODSTER_DB: /data/foodster.db
       TZ: ${TZ:-Europe/Helsinki}
     volumes:
-      - foodster-data:/data
-
-volumes:
-  foodster-data:
+      - ./data:/data