notyfikacje

server/README.md

@@ -2,9 +2,10 @@
 
 Two Flask services with separate responsibilities and separate databases:
 
-- **main app** (`app.py`) — all user-facing views: login, home, notes, API docs
+- **main app** (`app.py`) — all user-facing views: login, home, notes,
-  and the `/sensors` dashboard. It owns the **main app** database
+  notifications, API docs and the `/sensors` dashboard. It owns the **main app**
-  (`main_app.db`: users and notes) and proxies data requests to the sensors API.
+  database (`main_app.db`: users, notes and notifications) and proxies data
+  requests to the sensors API.
 - **sensors app** (`sensors_app.py`) — API only. It owns the **sensors**
   database (`sensors.db`, tables `sensor` and `sensor_readout`) and has no
   knowledge of users. Its API is open to every user on the local machine.
@@ -34,7 +35,7 @@ server/
 ├── auth.py                   # Flask-Login setup
 ├── config.py                 # Config (databases, secret key, sensors URL)
 ├── models.py                 # Sensor, SensorReadout (sensors DB)
-├── user_models.py            # User, Note, NoteItem (main_app.db)
+├── user_models.py            # User, Note, NoteItem, Notification
 ├── seed.py                   # Sample sensor data
 ├── migrate_legacy_db.py      # Import old combined data.db into split DBs
 ├── run.sh                    # Development launcher (main/sensors + port)
@@ -52,6 +53,7 @@ server/
     ├── home.html
     ├── login.html
     ├── notes.html
+    ├── notifications.html
     ├── docs.html
     └── sensors.html
 ```
@@ -102,12 +104,12 @@ After verifying the new databases you can archive or remove `data.db`.
 
 ## Users
 
-User accounts and notes live only in `main_app.db` (main app). There is no
+User accounts, notes and notifications live only in `main_app.db` (main app).
-public registration; accounts are created by an administrator.
+There is no public registration; accounts are created by an administrator.
 
-Main app pages (`/`, `/home`, `/notes`, `/api/docs`, `/sensors`) and dashboard
+Main app pages (`/`, `/home`, `/notes`, `/notifications`, `/api/docs`,
-read endpoints (`GET /api/sensors/:id/types`, `/readouts`, `/readouts/hourly`)
+`/sensors`) and dashboard read endpoints (`GET /api/sensors/:id/types`,
-require login. Device endpoints (`GET/POST /api/sensors`,
+`/readouts`, `/readouts/hourly`) require login. Device endpoints (`GET/POST /api/sensors`,
 `POST /api/sensors/:id/readouts`) stay open so devices can push data without a
 browser session.
 
@@ -178,6 +180,34 @@ automatically):
 alembic -c alembic_users.ini upgrade head
 ```
 
+## Notifications
+
+Each user has their own short text notifications in `main_app.db`. A
+notification is either **new** or **read**. The main navigation shows the number
+of new notifications next to the `Notifications` link. Opening a notification
+from the `/notifications` page marks it as read and moves it below the new ones.
+
+Create notifications with the CLI (run it as the same user as the service):
+
+```bash
+cd /home/mateusz/prog/yggdrasil/server
+
+# For one user
+sudo -u mateusz .venv/bin/flask --app app create-notification \
+    --username admin --message "Backup finished."
+
+# For every user
+sudo -u mateusz .venv/bin/flask --app app create-notification \
+    --all --message "Planned maintenance tonight."
+```
+
+Apply the users database migration once (the production launcher does this
+automatically):
+
+```bash
+alembic -c alembic_users.ini upgrade head
+```
+
 ## Running
 
 The first argument selects the app (`main` or `sensors`), the second the port.
@@ -291,7 +321,7 @@ deployment path or user is different.
 
 | Service | Port | Routes |
 |---|---|---|
-| main | 8000 | `/`, `/login`, `/home`, `/notes`, `/sensors`, `/api/docs`, `/api/*` (proxy) |
+| main | 8000 | `/`, `/login`, `/home`, `/notes`, `/notifications`, `/sensors`, `/api/docs`, `/api/*` (proxy) |
 | sensors | 8001 | `/api/*` (sensors and readouts) |
 
 ### Tests
@@ -322,9 +352,9 @@ Owned by the sensors app. Contains only sensor data.
 | `value` | Float | Measured value |
 | `timestamp` | DateTime | Readout timestamp (UTC) |
 
-### main_app.db (users and notes)
+### main_app.db (users, notes and notifications)
 
-Owned by the main app. Contains accounts and notes.
+Owned by the main app. Contains accounts, notes and notifications.
 
 **user**
 | Column | Type | Description |
@@ -354,6 +384,16 @@ Owned by the main app. Contains accounts and notes.
 | `is_done` | Boolean | Checked state (checked items render last, struck through) |
 | `created_at` | DateTime | Creation timestamp (UTC) |
 
+**notification**
+| Column | Type | Description |
+|---|---|---|
+| `id` | Integer | Primary key |
+| `user_id` | Integer | Foreign key to `user.id` (recipient) |
+| `message` | String(500) | Short notification text |
+| `is_read` | Boolean | `false` = new, `true` = read |
+| `created_at` | DateTime | Creation timestamp (UTC) |
+| `read_at` | DateTime | When the notification was read, or `NULL` |
+
 ### Inspecting the databases on Linux
 
 The databases are ordinary SQLite files. Use the `sqlite3` CLI (install it with

server/alembic_users/versions/e2b6d8f0a4c1_create_notifications.py

@@ -0,0 +1,40 @@
+"""create notifications
+
+Revision ID: e2b6d8f0a4c1
+Revises: c9e5a1b7d3f2
+Create Date: 2026-11-01 18:55:00.000000
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision: str = "e2b6d8f0a4c1"
+down_revision: Union[str, Sequence[str], None] = "c9e5a1b7d3f2"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_table(
+        "notification",
+        sa.Column("id", sa.Integer(), nullable=False),
+        sa.Column("user_id", sa.Integer(), nullable=False),
+        sa.Column("message", sa.String(length=500), nullable=False),
+        sa.Column("is_read", sa.Boolean(), nullable=False),
+        sa.Column("created_at", sa.DateTime(), nullable=False),
+        sa.Column("read_at", sa.DateTime(), nullable=True),
+        sa.ForeignKeyConstraint(["user_id"], ["user.id"]),
+        sa.PrimaryKeyConstraint("id"),
+    )
+    op.create_index(
+        op.f("ix_notification_user_id"), "notification", ["user_id"], unique=False
+    )
+
+
+def downgrade() -> None:
+    op.drop_index(op.f("ix_notification_user_id"), table_name="notification")
+    op.drop_table("notification")

server/app.py

@@ -14,7 +14,7 @@ from flask_login import current_user, login_required, login_user, logout_user
 from auth import init_login_manager
 from config import load_secret_key, sensors_api_url, users_database_uri
 from sensors_client import SensorsAPIError, SensorsClient
-from user_models import Note, NoteItem, User, user_db
+from user_models import Note, NoteItem, Notification, User, user_db
 
 
 def create_app():
@@ -53,8 +53,16 @@ def create_app():
         return jsonify(data), status
 
     @app.context_processor
-    def inject_service_urls():
+    def inject_globals():
-        return {"main_api_url": request.url_root.rstrip("/") + "/api"}
+        unread_notifications = 0
+        if current_user.is_authenticated:
+            unread_notifications = Notification.query.filter_by(
+                user_id=current_user.id, is_read=False
+            ).count()
+        return {
+            "main_api_url": request.url_root.rstrip("/") + "/api",
+            "unread_notifications": unread_notifications,
+        }
 
     # --- Pages ---
 
@@ -103,6 +111,40 @@ def create_app():
     def api_docs():
         return render_template("docs.html", user=current_user)
 
+    # --- Notifications (stored in main_app.db) ---
+
+    @app.route("/notifications")
+    @login_required
+    def notifications_page():
+        notifications = (
+            Notification.query.filter_by(user_id=current_user.id)
+            .order_by(
+                Notification.is_read.asc(),
+                Notification.created_at.desc(),
+                Notification.id.desc(),
+            )
+            .all()
+        )
+        return render_template(
+            "notifications.html", user=current_user, notifications=notifications
+        )
+
+    @app.route("/notifications/<int:notification_id>/read")
+    @login_required
+    def notification_read(notification_id):
+        notification = Notification.query.filter_by(
+            id=notification_id, user_id=current_user.id
+        ).first_or_404()
+        if not notification.is_read:
+            notification.mark_read()
+            user_db.session.commit()
+        return redirect(
+            url_for(
+                "notifications_page",
+                _anchor=f"notification-{notification.id}",
+            )
+        )
+
     # --- Notes (stored in main_app.db) ---
 
     def _note_or_404(note_id):
@@ -287,6 +329,37 @@ def create_app():
             user_db.session.commit()
             click.echo(f"Created administrator '{username}'.")
 
+    @app.cli.command("create-notification")
+    @click.option("--username", default=None, help="Recipient username")
+    @click.option("--all", "all_users", is_flag=True, help="Send to all users")
+    @click.option("--message", default=None, help="Notification text")
+    def create_notification(username, all_users, message):
+        """Create a notification for one user or for all users."""
+        if all_users and username:
+            raise click.ClickException("Use either --username or --all, not both.")
+        if not all_users and not username:
+            raise click.ClickException("Provide --username or --all.")
+
+        message = (message or "").strip()
+        if not message:
+            message = click.prompt("Message").strip()
+        if not message:
+            raise click.ClickException("Message cannot be empty.")
+        message = message[:500]
+
+        if all_users:
+            users = User.query.all()
+        else:
+            user = User.query.filter_by(username=username).first()
+            if not user:
+                raise click.ClickException(f"User '{username}' not found.")
+            users = [user]
+
+        for user in users:
+            user_db.session.add(Notification(user_id=user.id, message=message))
+        user_db.session.commit()
+        click.echo(f"Created {len(users)} notification(s).")
+
     return app
 
 

server/static/retro.css

@@ -100,6 +100,16 @@ nav a {
     margin-right: 0.2em;
 }
 nav a:hover { background: var(--mc-cyan); color: var(--mc-black); }
+.nav-badge {
+    display: inline-block;
+    background: var(--mc-yellow);
+    color: var(--mc-black);
+    border: 1px solid var(--mc-black);
+    padding: 0 0.35em;
+    margin-left: 0.25em;
+    font-size: 0.8em;
+    line-height: 1.2;
+}
 
 /* --- Panels and dialogs --- */
 .panel {
@@ -393,3 +403,44 @@ textarea {
 .note-delete-form { margin-top: 0.75rem; }
 .note-delete-form button { background: var(--mc-red); color: var(--mc-bright); }
 .note-delete-form button:hover { background: var(--mc-red-bright); }
+
+
+/* --- Notifications --- */
+.notification-list { list-style: none; padding: 0; margin: 1rem 0; }
+.notification-item {
+    border: 2px solid var(--mc-dim);
+    margin: 0.5rem 0;
+    background: var(--mc-deep);
+}
+.notification-item.unread { border-left: 6px solid var(--mc-yellow); }
+.notification-item.read { opacity: 0.78; }
+.notification-item a {
+    display: block;
+    padding: 0.5rem 0.7rem;
+    color: var(--mc-fg);
+    text-decoration: none;
+}
+.notification-item a:hover {
+    background: var(--mc-cyan);
+    color: var(--mc-black);
+}
+.notification-message { display: block; margin-bottom: 0.25rem; }
+.notification-meta {
+    display: flex;
+    align-items: center;
+    gap: 0.75em;
+    font-size: 0.8em;
+    color: var(--mc-dim);
+}
+.notification-item a:hover .notification-meta { color: var(--mc-black); }
+.notification-status {
+    text-transform: uppercase;
+    letter-spacing: 1px;
+    padding: 0 0.45em;
+    background: var(--mc-dim);
+    color: var(--mc-black);
+}
+.notification-item.unread .notification-status {
+    background: var(--mc-yellow);
+    color: var(--mc-black);
+}

server/templates/docs.html

@@ -13,6 +13,8 @@
         <a href="{{ url_for('home') }}">Home</a>
         <a href="{{ url_for('sensors_page') }}">Sensors</a>
         <a href="{{ url_for('notes_page') }}">Notes</a>
+        <a href="{{ url_for('notifications_page') }}">Notifications{% if unread_notifications %} <span class="nav-badge">{{ unread_notifications }}</span>{% endif %}</a>
+        <a href="{{ url_for('api_docs') }}">API</a>
         <a href="{{ url_for('logout') }}">Log out</a>
         <img class="nav-logo" src="{{ url_for('static', filename='yggdrasil-logo.png') }}" alt="Yggdrasil logo">
     </nav>

server/templates/home.html

@@ -13,6 +13,7 @@
         <a href="{{ url_for('home') }}">Home</a>
         <a href="{{ url_for('sensors_page') }}">Sensors</a>
         <a href="{{ url_for('notes_page') }}">Notes</a>
+        <a href="{{ url_for('notifications_page') }}">Notifications{% if unread_notifications %} <span class="nav-badge">{{ unread_notifications }}</span>{% endif %}</a>
         <a href="{{ url_for('api_docs') }}">API</a>
         <a href="{{ url_for('logout') }}">Log out</a>
         <img class="nav-logo" src="{{ url_for('static', filename='yggdrasil-logo.png') }}" alt="Yggdrasil logo">
@@ -24,10 +25,11 @@
         <ul class="mc-menu">
             <li><a href="{{ url_for('sensors_page') }}"><span class="mc-key">1</span>Sensors — charts and readouts</a></li>
             <li><a href="{{ url_for('notes_page') }}"><span class="mc-key">2</span>Notes — title, text and checklists</a></li>
-            <li><a href="{{ url_for('api_docs') }}"><span class="mc-key">3</span>API — documentation</a></li>
+            <li><a href="{{ url_for('notifications_page') }}"><span class="mc-key">3</span>Notifications{% if unread_notifications %} ({{ unread_notifications }} new){% endif %}</a></li>
+            <li><a href="{{ url_for('api_docs') }}"><span class="mc-key">4</span>API — documentation</a></li>
             <li><a href="{{ url_for('logout') }}"><span class="mc-key">0</span>Log out</a></li>
         </ul>
-        <p class="hint">Tip: press <b>1</b>, <b>2</b>, <b>3</b> or <b>0</b> to navigate.</p>
+        <p class="hint">Tip: press <b>1</b>, <b>2</b>, <b>3</b>, <b>4</b> or <b>0</b> to navigate.</p>
     </div>
     <img class="logo" src="{{ url_for('static', filename='yggdrasil-logo.png') }}" alt="Yggdrasil logo">
     <footer class="statusbar">
@@ -43,7 +45,8 @@
             const targets = {
                 '1': "{{ url_for('sensors_page') }}",
                 '2': "{{ url_for('notes_page') }}",
-                '3': "{{ url_for('api_docs') }}",
+                '3': "{{ url_for('notifications_page') }}",
+                '4': "{{ url_for('api_docs') }}",
                 '0': "{{ url_for('logout') }}"
             };
             if (targets[e.key]) window.location.href = targets[e.key];

server/templates/notes.html

@@ -13,6 +13,7 @@
         <a href="{{ url_for('home') }}">Home</a>
         <a href="{{ url_for('sensors_page') }}">Sensors</a>
         <a href="{{ url_for('notes_page') }}">Notes</a>
+        <a href="{{ url_for('notifications_page') }}">Notifications{% if unread_notifications %} <span class="nav-badge">{{ unread_notifications }}</span>{% endif %}</a>
         <a href="{{ url_for('api_docs') }}">API</a>
         <a href="{{ url_for('logout') }}">Log out</a>
         <img class="nav-logo" src="{{ url_for('static', filename='yggdrasil-logo.png') }}" alt="Yggdrasil logo">

server/templates/notifications.html

@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Notifications — Yggdrasil</title>
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link href="https://fonts.googleapis.com/css2?family=VT323&display=swap" rel="stylesheet">
+    <link rel="stylesheet" href="{{ url_for('static', filename='retro.css') }}">
+</head>
+<body>
+    <nav>
+        <a href="{{ url_for('home') }}">Home</a>
+        <a href="{{ url_for('sensors_page') }}">Sensors</a>
+        <a href="{{ url_for('notes_page') }}">Notes</a>
+        <a href="{{ url_for('notifications_page') }}">Notifications{% if unread_notifications %} <span class="nav-badge">{{ unread_notifications }}</span>{% endif %}</a>
+        <a href="{{ url_for('api_docs') }}">API</a>
+        <a href="{{ url_for('logout') }}">Log out</a>
+        <img class="nav-logo" src="{{ url_for('static', filename='yggdrasil-logo.png') }}" alt="Yggdrasil logo">
+    </nav>
+    <h1>Notifications</h1>
+
+    <p class="hint">
+        {% if unread_notifications %}
+        {{ unread_notifications }} new notification{{ "s" if unread_notifications != 1 else "" }}.
+        {% else %}
+        No new notifications.
+        {% endif %}
+    </p>
+
+    {% if not notifications %}
+    <p class="hint">There are no notifications yet.</p>
+    {% else %}
+    <ul class="notification-list">
+        {% for notification in notifications %}
+        <li id="notification-{{ notification.id }}"
+            class="notification-item {{ notification.status }}">
+            <a href="{{ url_for('notification_read', notification_id=notification.id) }}"
+               title="{{ 'Mark as read' if notification.status == 'new' else 'Read notification' }}">
+                <span class="notification-message">{{ notification.message }}</span>
+                <span class="notification-meta">
+                    <span class="notification-status">{{ notification.status }}</span>
+                    <span>{{ notification.created_at.strftime("%Y-%m-%d %H:%M") }}</span>
+                </span>
+            </a>
+        </li>
+        {% endfor %}
+    </ul>
+    {% endif %}
+
+    <footer class="statusbar">
+        <span>{{ user.username }}@yggdrasil:~/notifications$</span>
+    </footer>
+</body>
+</html>

server/templates/sensors.html

@@ -12,7 +12,9 @@
 <body>
     <nav>
         <a href="{{ url_for('home') }}">Home</a>
+        <a href="{{ url_for('sensors_page') }}">Sensors</a>
         <a href="{{ url_for('notes_page') }}">Notes</a>
+        <a href="{{ url_for('notifications_page') }}">Notifications{% if unread_notifications %} <span class="nav-badge">{{ unread_notifications }}</span>{% endif %}</a>
         <a href="{{ url_for('api_docs') }}">API</a>
         <a href="{{ url_for('logout') }}">Log out</a>
         <img class="nav-logo" src="{{ url_for('static', filename='yggdrasil-logo.png') }}" alt="Yggdrasil logo">

server/tests/test_split_apps.py

@@ -168,6 +168,7 @@ class MainAppTest(unittest.TestCase):
         self.assertEqual(self.client.get("/home").status_code, 200)
         self.assertEqual(self.client.get("/sensors").status_code, 200)
         self.assertEqual(self.client.get("/notes").status_code, 200)
+        self.assertEqual(self.client.get("/notifications").status_code, 200)
         self.assertEqual(self.client.get("/api/docs").status_code, 200)
 
     def test_public_device_api_is_proxied_to_sensors(self):
@@ -275,6 +276,71 @@ class MainAppTest(unittest.TestCase):
                 ["second item", "renamed first item"],
             )
 
+    def test_notifications_badge_and_mark_read(self):
+        from user_models import Notification, User, user_db
+
+        self.login()
+        with self.main_app.app_context():
+            user = User.query.filter_by(username="tester").one()
+            other = User(username="other-user")
+            other.set_password("secret")
+            user_db.session.add(other)
+            user_db.session.flush()
+
+            first = Notification(user_id=user.id, message="first notification")
+            second = Notification(user_id=user.id, message="second notification")
+            foreign = Notification(user_id=other.id, message="other user notification")
+            user_db.session.add_all([first, second, foreign])
+            user_db.session.commit()
+            first_id = first.id
+            foreign_id = foreign.id
+
+        home = self.client.get("/home").get_data(as_text=True)
+        self.assertIn('nav-badge">2</span>', home)
+
+        page = self.client.get("/notifications")
+        html = page.get_data(as_text=True)
+        self.assertEqual(page.status_code, 200)
+        self.assertIn("first notification", html)
+        self.assertIn("second notification", html)
+        self.assertNotIn("other user notification", html)
+        self.assertEqual(html.count('class="notification-item new"'), 2)
+
+        read = self.client.get(f"/notifications/{first_id}/read")
+        self.assertEqual(read.status_code, 302)
+
+        with self.main_app.app_context():
+            user_db.session.expire_all()
+            notification = user_db.session.get(Notification, first_id)
+            self.assertTrue(notification.is_read)
+            self.assertIsNotNone(notification.read_at)
+
+        page = self.client.get("/notifications")
+        html = page.get_data(as_text=True)
+        self.assertIn("1 new notification.", html)
+        self.assertIn('nav-badge">1</span>', html)
+        self.assertEqual(html.count('class="notification-item read"'), 1)
+        self.assertEqual(html.count('class="notification-item new"'), 1)
+
+        self.assertEqual(
+            self.client.get(f"/notifications/{foreign_id}/read").status_code, 404
+        )
+
+    def test_navigation_links_are_present_on_all_pages(self):
+        self.login()
+        links = (
+            'href="/home"',
+            'href="/sensors"',
+            'href="/notes"',
+            'href="/notifications"',
+            'href="/api/docs"',
+            'href="/logout"',
+        )
+        for path in ("/home", "/sensors", "/notes", "/notifications", "/api/docs"):
+            html = self.client.get(path).get_data(as_text=True)
+            for link in links:
+                self.assertIn(link, html, f"{link} missing on {path}")
+
 
 if __name__ == "__main__":
     unittest.main()

server/user_models.py

@@ -79,3 +79,27 @@ class NoteItem(user_db.Model):
     )
 
     note = relationship("Note", back_populates="items")
+
+
+class Notification(user_db.Model):
+    __tablename__ = "notification"
+
+    id = user_db.Column(user_db.Integer, primary_key=True)
+    user_id = user_db.Column(
+        user_db.Integer, user_db.ForeignKey("user.id"), nullable=False, index=True
+    )
+    message = user_db.Column(user_db.String(500), nullable=False)
+    is_read = user_db.Column(user_db.Boolean, nullable=False, default=False)
+    created_at = user_db.Column(
+        user_db.DateTime, nullable=False, default=lambda: datetime.now(timezone.utc)
+    )
+    read_at = user_db.Column(user_db.DateTime, nullable=True)
+
+    @property
+    def status(self) -> str:
+        return "read" if self.is_read else "new"
+
+    def mark_read(self) -> None:
+        if not self.is_read:
+            self.is_read = True
+            self.read_at = datetime.now(timezone.utc)