diff --git a/app.py b/app.py
index 26a0250..259d6a8 100644
--- a/app.py
+++ b/app.py
@@ -1,4 +1,4 @@
-from flask import Flask, render_template, redirect, url_for, request, flash, abort
+from flask import Flask, render_template, redirect, url_for, request, flash, abort, send_from_directory
from sqlalchemy import create_engine, func
from sqlalchemy.orm import scoped_session, sessionmaker
@@ -25,6 +25,11 @@ def create_app(config_object="config"):
# Dashboard
# ------------------------------------------------------------------ #
+ @app.route("/sw.js")
+ def service_worker():
+ return send_from_directory(app.static_folder, "sw.js",
+ mimetype="application/javascript")
+
@app.route("/")
def dashboard():
batteries = db.query(Battery).order_by(Battery.label).all()
diff --git a/sbin/gen_icons.py b/sbin/gen_icons.py
new file mode 100644
index 0000000..7ca41e3
--- /dev/null
+++ b/sbin/gen_icons.py
@@ -0,0 +1,31 @@
+"""Generate solid-color PNG icons for PWA manifest using stdlib only (no Pillow)."""
+import zlib, struct, os
+
+def make_png(size, rgb=(0x25, 0x63, 0xEB)):
+ """Create a minimal valid RGB PNG of the given size filled with one color."""
+ w = h = size
+ raw = b''
+ for _ in range(h):
+ raw += b'\x00' + bytes(rgb) * w # filter byte 0 (None) + RGB pixels
+
+ compressed = zlib.compress(raw, 9)
+
+ def chunk(name, data):
+ c = name + data
+ return struct.pack('>I', len(data)) + c + struct.pack('>I', zlib.crc32(c) & 0xffffffff)
+
+ sig = b'\x89PNG\r\n\x1a\n'
+ ihdr = chunk(b'IHDR', struct.pack('>IIBBBBB', w, h, 8, 2, 0, 0, 0))
+ idat = chunk(b'IDAT', compressed)
+ iend = chunk(b'IEND', b'')
+ return sig + ihdr + idat + iend
+
+
+if __name__ == '__main__':
+ out_dir = os.path.join(os.path.dirname(__file__), '..', 'static')
+ os.makedirs(out_dir, exist_ok=True)
+ for size in [192, 512]:
+ path = os.path.join(out_dir, f'icon-{size}.png')
+ with open(path, 'wb') as f:
+ f.write(make_png(size))
+ print(f'Wrote {path}')
diff --git a/static/icon-192.png b/static/icon-192.png
new file mode 100644
index 0000000..6cb1d70
Binary files /dev/null and b/static/icon-192.png differ
diff --git a/static/icon-512.png b/static/icon-512.png
new file mode 100644
index 0000000..9dda085
Binary files /dev/null and b/static/icon-512.png differ
diff --git a/static/manifest.json b/static/manifest.json
new file mode 100644
index 0000000..0e694e2
--- /dev/null
+++ b/static/manifest.json
@@ -0,0 +1,12 @@
+{
+ "name": "Battery Tracker",
+ "short_name": "Batteries",
+ "start_url": "/",
+ "display": "standalone",
+ "background_color": "#ffffff",
+ "theme_color": "#2563eb",
+ "icons": [
+ { "src": "/static/icon-192.png", "sizes": "192x192", "type": "image/png" },
+ { "src": "/static/icon-512.png", "sizes": "512x512", "type": "image/png" }
+ ]
+}
diff --git a/static/sw.js b/static/sw.js
new file mode 100644
index 0000000..05206ed
--- /dev/null
+++ b/static/sw.js
@@ -0,0 +1,5 @@
+// Minimal service worker — required for PWA installability
+self.addEventListener('install', function(e) { self.skipWaiting(); });
+self.addEventListener('activate', function(e) { e.waitUntil(clients.claim()); });
+// No caching — app requires live server data
+self.addEventListener('fetch', function(e) {});
diff --git a/templates/base.html b/templates/base.html
index 751fc4e..a373208 100644
--- a/templates/base.html
+++ b/templates/base.html
@@ -4,6 +4,12 @@
{% block title %}Battery Tracker{% endblock %}
+
+
+
+
+
+