feat: add SQLite persistence models

tests/db/test_repositories.py

@@ -0,0 +1,54 @@
+from app.db.models import ActivityStatus, HealthState
+
+
+def test_create_two_independent_users(db_session, user_repository) -> None:
+    first = user_repository.create(
+        name="Max",
+        enabled=True,
+        health_state=HealthState.HEALTHY,
+        mywhoosh_email_enc="mw-1",
+        mywhoosh_password_enc="mw-pw-1",
+        garmin_email_enc="g-1",
+        garmin_password_enc="g-pw-1",
+    )
+    second = user_repository.create(
+        name="Anna",
+        enabled=True,
+        health_state=HealthState.HEALTHY,
+        mywhoosh_email_enc="mw-2",
+        mywhoosh_password_enc="mw-pw-2",
+        garmin_email_enc="g-2",
+        garmin_password_enc="g-pw-2",
+    )
+
+    assert first.id != second.id
+    assert {u.name for u in user_repository.list_enabled()} == {"Max", "Anna"}
+
+
+def test_activity_external_id_is_unique_per_user(user_repository, activity_repository) -> None:
+    user = user_repository.create(
+        name="Max",
+        enabled=True,
+        health_state=HealthState.HEALTHY,
+        mywhoosh_email_enc="a",
+        mywhoosh_password_enc="b",
+        garmin_email_enc="c",
+        garmin_password_enc="d",
+    )
+    created, inserted = activity_repository.get_or_create_discovered(
+        user_id=user.id,
+        mywhoosh_activity_id="mw-123",
+        activity_name="Morning Ride",
+        activity_timestamp=None,
+    )
+    same, inserted_again = activity_repository.get_or_create_discovered(
+        user_id=user.id,
+        mywhoosh_activity_id="mw-123",
+        activity_name="Morning Ride",
+        activity_timestamp=None,
+    )
+
+    assert inserted is True
+    assert inserted_again is False
+    assert created.id == same.id
+    assert same.status == ActivityStatus.DISCOVERED