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+# ─────────────────────────────────────────────
+# QRknit — Dockerfile
+# Multi-stage build for a lean production image
+# ─────────────────────────────────────────────
+
+# ── Stage 1: Build deps ───────────────────────
+FROM python:3.12-slim AS builder
+
+WORKDIR /build
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    libjpeg-dev \
+    zlib1g-dev \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --upgrade pip && \
+    pip install --prefix=/install --no-cache-dir -r requirements.txt
+
+
+# ── Stage 2: Runtime image ────────────────────
+FROM python:3.12-slim AS runtime
+
+LABEL maintainer="QRknit"
+LABEL description="Self-hosted URL shortener and QR code generator"
+LABEL version="1.0"
+
+# Runtime system deps (Pillow needs libjpeg)
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libjpeg62-turbo \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN groupadd -r qrknit && useradd -r -g qrknit -d /app -s /sbin/nologin qrknit
+
+WORKDIR /app
+
+# Copy installed Python packages from builder
+COPY --from=builder /install /usr/local
+
+# Copy application files
+COPY --chown=qrknit:qrknit app.py .
+COPY --chown=qrknit:qrknit index.html .
+COPY --chown=qrknit:qrknit landing.html .
+COPY --chown=qrknit:qrknit landing-os.html .
+COPY --chown=qrknit:qrknit api-docs.html .
+COPY --chown=qrknit:qrknit static/ ./static/
+
+# Data volume — SQLite DB lives here
+# Map to host path in Unraid: /mnt/user/appdata/qrknit → /app/data
+VOLUME ["/app/data"]
+
+EXPOSE 5000
+
+# Health check — waits 15s for startup before first check
+# Uses /api/health (public, no auth required)
+HEALTHCHECK --interval=30s --timeout=10s --start-period=15s --retries=3 \
+    CMD python3 -c "import urllib.request; urllib.request.urlopen('http://localhost:5000/api/health')" || exit 1
+
+USER qrknit
+
+# Non-sensitive defaults only — SECRET_KEY and ADMIN_PASSWORD must be passed at runtime
+ENV BASE_URL=http://localhost:5000 \
+    APP_NAME=to.ALWISP \
+    ADMIN_USERNAME=admin \
+    PORT=5000 \
+    DEBUG=false \
+    DB_PATH=/app/data/qrknit.db
+
+# Start with Gunicorn
+CMD ["python3", "-m", "gunicorn", \
+     "--workers", "1", \
+     "--bind", "0.0.0.0:5000", \
+     "--timeout", "60", \
+     "--access-logfile", "-", \
+     "--error-logfile", "-", \
+     "app:app"]