From f4139e3ab07a631b9b4edbf6898fcbd8fe77080f Mon Sep 17 00:00:00 2001
From: Manuel Raynaud <manu@raynaud.io>
Date: Fri, 29 May 2026 17:02:48 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=93=88(backend)=20capture=20an=20event=20?=
 =?UTF-8?q?when=20a=20user=20logs=20in?=
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Content-Type: text/plain; charset=UTF-8
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We want to capture an event every time a user logs in.
---
 src/backend/core/authentication/backends.py   |  4 ++
 .../tests/authentication/test_backends.py     | 61 +++++++++++++++----
 src/backend/core/utils/analytics.py           |  1 +
 3 files changed, 54 insertions(+), 12 deletions(-)

diff --git a/src/backend/core/authentication/backends.py b/src/backend/core/authentication/backends.py
index 898bd12e4..d168d2665 100644
--- a/src/backend/core/authentication/backends.py
+++ b/src/backend/core/authentication/backends.py
@@ -12,6 +12,7 @@ from lasuite.oidc_login.backends import (
 )
 
 from core.models import DuplicateEmailError
+from core.utils.analytics import PosthogEventName, posthog_capture
 
 logger = logging.getLogger(__name__)
 
@@ -77,3 +78,6 @@ class OIDCAuthenticationBackend(LaSuiteOIDCAuthenticationBackend):
             create_or_update_contact.delay(
                 email=user.email, attributes={"DOCS_SOURCE": ["SIGNIN"]}
             )
+
+        if user:
+            posthog_capture(PosthogEventName.USER_LOGIN, user)
diff --git a/src/backend/core/tests/authentication/test_backends.py b/src/backend/core/tests/authentication/test_backends.py
index 0ff0a78aa..0a20319fd 100644
--- a/src/backend/core/tests/authentication/test_backends.py
+++ b/src/backend/core/tests/authentication/test_backends.py
@@ -17,6 +17,7 @@ from core.authentication.backends import (
     create_or_update_contact,
 )
 from core.factories import UserFactory
+from core.utils.analytics import PosthogEventName
 
 pytestmark = pytest.mark.django_db
 
@@ -502,13 +503,22 @@ def test_authentication_post_get_or_create_user_new_user_to_marketing_email(sett
     settings.SIGNUP_NEW_USER_TO_MARKETING_EMAIL = True
 
     klass = OIDCAuthenticationBackend()
-    with mock.patch.object(
-        create_or_update_contact, "delay"
-    ) as mock_create_or_update_contact:
+    with (
+        mock.patch.object(
+            create_or_update_contact, "delay"
+        ) as mock_create_or_update_contact,
+        mock.patch(
+            "core.authentication.backends.posthog_capture"
+        ) as mock_posthog_capture,
+    ):
         klass.post_get_or_create_user(user, {}, True)
         mock_create_or_update_contact.assert_called_once_with(
             email=user.email, attributes={"DOCS_SOURCE": ["SIGNIN"]}
         )
+        mock_posthog_capture.assert_called_once_with(
+            PosthogEventName.USER_LOGIN,
+            user,
+        )
 
 
 def test_authentication_post_get_or_create_user_new_user_to_marketing_email_disabled(
@@ -523,11 +533,20 @@ def test_authentication_post_get_or_create_user_new_user_to_marketing_email_disa
     settings.SIGNUP_NEW_USER_TO_MARKETING_EMAIL = False
 
     klass = OIDCAuthenticationBackend()
-    with mock.patch.object(
-        create_or_update_contact, "delay"
-    ) as mock_create_or_update_contact:
+    with (
+        mock.patch.object(
+            create_or_update_contact, "delay"
+        ) as mock_create_or_update_contact,
+        mock.patch(
+            "core.authentication.backends.posthog_capture"
+        ) as mock_posthog_capture,
+    ):
         klass.post_get_or_create_user(user, {}, True)
         mock_create_or_update_contact.assert_not_called()
+        mock_posthog_capture.assert_called_once_with(
+            PosthogEventName.USER_LOGIN,
+            user,
+        )
 
 
 def test_authentication_post_get_or_create_user_existing_user_to_marketing_email(
@@ -542,11 +561,20 @@ def test_authentication_post_get_or_create_user_existing_user_to_marketing_email
     settings.SIGNUP_NEW_USER_TO_MARKETING_EMAIL = True
 
     klass = OIDCAuthenticationBackend()
-    with mock.patch.object(
-        create_or_update_contact, "delay"
-    ) as mock_create_or_update_contact:
+    with (
+        mock.patch.object(
+            create_or_update_contact, "delay"
+        ) as mock_create_or_update_contact,
+        mock.patch(
+            "core.authentication.backends.posthog_capture"
+        ) as mock_posthog_capture,
+    ):
         klass.post_get_or_create_user(user, {}, False)
         mock_create_or_update_contact.assert_not_called()
+        mock_posthog_capture.assert_called_once_with(
+            PosthogEventName.USER_LOGIN,
+            user,
+        )
 
 
 def test_authentication_post_get_or_create_user_existing_user_to_marketing_email_disabled(
@@ -561,8 +589,17 @@ def test_authentication_post_get_or_create_user_existing_user_to_marketing_email
     settings.SIGNUP_NEW_USER_TO_MARKETING_EMAIL = False
 
     klass = OIDCAuthenticationBackend()
-    with mock.patch.object(
-        create_or_update_contact, "delay"
-    ) as mock_create_or_update_contact:
+    with (
+        mock.patch.object(
+            create_or_update_contact, "delay"
+        ) as mock_create_or_update_contact,
+        mock.patch(
+            "core.authentication.backends.posthog_capture"
+        ) as mock_posthog_capture,
+    ):
         klass.post_get_or_create_user(user, {}, False)
         mock_create_or_update_contact.assert_not_called()
+        mock_posthog_capture.assert_called_once_with(
+            PosthogEventName.USER_LOGIN,
+            user,
+        )
diff --git a/src/backend/core/utils/analytics.py b/src/backend/core/utils/analytics.py
index 46bb675c6..6120fa3d3 100644
--- a/src/backend/core/utils/analytics.py
+++ b/src/backend/core/utils/analytics.py
@@ -16,6 +16,7 @@ class PosthogEventName(StrEnum):
 
     DOC_CREATED = "doc_created"
     DOC_DELETED = "doc_deleted"
+    USER_LOGIN = "user_login"
 
 
 def posthog_capture(