Add exc_info=True to OAuth error logging and endpoint-level catch in google_oauth

Agent-Logs-Url: https://github.com/christianlouis/InboxConverge/sessions/8d0fb51a-ede5-4bb7-aad8-3d29a0d3d7d3

Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 <!-- version list -->
 
+## [Unreleased]
+
+### Fixed
+
+- OAuth Google sign-in: added `exc_info=True` to the catch-all exception handler in `auth_service.py` so the full traceback is always emitted to the log instead of only `str(e)`.
+- OAuth Google sign-in: added an endpoint-level try/except in the `/auth/google` handler to catch and log any unexpected errors (e.g. database failures) that occurred after the Google token exchange, which previously surfaced as silent 500s.
+
 ## v0.8.0 (2026-05-03)
 
 ### Bug Fixes

backend/app/api/v1/endpoints/auth.py

@@ -187,6 +187,7 @@ async def google_oauth(
         auth_request.redirect_uri,
     )
 
+    try:
         # Get user info from Google
         user_info = await oauth_service.get_google_user_info(
             code=auth_request.code, redirect_uri=auth_request.redirect_uri
@@ -270,6 +271,19 @@ async def google_oauth(
         OAUTH_CALLBACKS_TOTAL.labels(provider="google", status="success").inc()
         return tokens
 
+    except HTTPException:
+        raise
+    except Exception:
+        OAUTH_CALLBACKS_TOTAL.labels(provider="google", status="error").inc()
+        logger.error(
+            "OAuth [Google sign-in]: unhandled error during sign-in flow",
+            exc_info=True,
+        )
+        raise HTTPException(
+            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
+            detail="OAuth authentication failed",
+        )
+
 
 @router.get("/google/authorize-url")
 async def get_google_authorize_url(redirect_uri: str):

backend/app/services/auth_service.py

@@ -142,7 +142,11 @@ class OAuthService:
         except HTTPException:
             raise
         except Exception as e:
-            logger.error("OAuth [Google sign-in]: unexpected error: %s", e)
+            logger.error(
+                "OAuth [Google sign-in]: unexpected error: %s",
+                e,
+                exc_info=True,
+            )
             raise HTTPException(
                 status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
                 detail="OAuth authentication failed",