datastore: Add unverify_user method

* Provides a programmatic way to revert user verification.
* Avoids the need for direct database modifications.
* Enables correction of verification errors from admin panel.
* partially closes <inveniosoftware/invenio-administration#202>

invenio_accounts/datastore.py

@@ -33,6 +33,11 @@ def verify_user(self, user):
             user.confirmed_at = now
         return True
 
+    def unverify_user(self, user):
+        """Unverify a user."""
+        user.verified_at = None
+        return True
+
     def block_user(self, user):
         """Verify a user."""
         now = datetime.utcnow()

tests/test_sessions.py

@@ -288,3 +288,21 @@ def test_session_ip_no_country(app, users):
         [session] = SessionActivity.query.all()
         assert session.country is None
         assert session.ip == "139.191.247.1"
+
+
+def test_unverify_user(app):
+    """Test unverifying a user."""
+    with app.app_context():
+        user = testutils.create_test_user(
+            "[email protected]",
+            verified_at=datetime.datetime.now(datetime.timezone.utc),
+        )
+
+        # Ensure the user starts off as verified
+        assert user.verified_at is not None
+
+        _datastore.unverify_user(user)
+        db.session.commit()  # Assuming that commit is needed to persist changes to the database
+
+        # Ensure the user is no longer verified
+        assert user.verified_at is None