diff --git a/README.md b/README.md
index 58328df..3eb8c7e 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,24 @@ Data will eventuall be stored in a SQLite database.
 uv run pytest tests.py
 ```
 
+## Observing the app's console
+
+You will need two terminals: one for showing the console, the other to run the app.
+
+Since we use uv the incantation is bit different from the official documenation:
+
+In one terminal:
+
+```shell
+textual console
+```
+
+And in the other:
+
+```shell
+uv run textual run --dev src/teilchensammler_cli/__init__.py
+```
+
 ## Creating a new release
 
 * make code changes
diff --git a/src/teilchensammler_cli/main.py b/src/teilchensammler_cli/main.py
index d8494bd..256c497 100644
--- a/src/teilchensammler_cli/main.py
+++ b/src/teilchensammler_cli/main.py
@@ -16,8 +16,7 @@ from textual.widgets import (
     Input,
     Static,
 )
-from tortoise import Tortoise, fields
-from tortoise.models import Model
+from tortoise import Tortoise
 
 
 @final
@@ -101,7 +100,8 @@ class AddInventoryScreen(Screen[None]):
 class SammlerApp(App[None]):
     async def on_mount(self) -> None:
         await Tortoise.init(
-            db_url="sqlite://db.sqlite3", modules={"models": ["teilchensammler_cli"]}
+            db_url="sqlite://db.sqlite3",
+            modules={"models": ["teilchensammler_cli.models"]},
         )
         await Tortoise.generate_schemas()
         _ = self.push_screen(AddInventoryScreen())
diff --git a/src/teilchensammler_cli/models.py b/src/teilchensammler_cli/models.py
new file mode 100644
index 0000000..19839da
--- /dev/null
+++ b/src/teilchensammler_cli/models.py
@@ -0,0 +1,38 @@
+from typing import final
+
+from tortoise import Model, fields
+
+
+@final
+class Teilchen(Model):
+    name = fields.TextField()
+    description = fields.TextField()
+    number = fields.IntField()  # validate values >= 0
+
+    created_at = fields.DatetimeField(auto_now_add=True)
+    modified_at = fields.DatetimeField(auto_now=True)
+
+    tags = fields.ManyToManyField(
+        "models.Tag",
+        through="models.TeilchenTag",
+        related_name="teilchen",
+        forward_key="tag_id",
+        backward_key="teilchen_id",
+    )
+
+
+@final
+class Tag(Model):
+    name = fields.CharField(max_length=20)
+
+    created_at = fields.DatetimeField(auto_now_add=True)
+    modified_at = fields.DatetimeField(auto_now=True)
+
+
+@final
+class TeilchenTag(Model):
+    teilchen: fields.ForeignKeyRelation[Teilchen] = fields.ForeignKeyField(
+        "models.Teilchen"
+    )
+    tag: fields.ForeignKeyRelation[Tag] = fields.ForeignKeyField("models.Tag")
+    weight = fields.IntField()