feat(friendships): add structured logging to FriendshipService

backend/src/v1/friendships/service.py

@@ -87,6 +87,11 @@ class FriendshipService(BaseService):
                 status_code=503, detail="Friendship service unavailable"
             )
 
+        logger.info(
+            "friend_request_sent",
+            extra={"initiator_id": str(user_id), "target_id": str(target_user_id)},
+        )
+
         sender = await self._user_repository.get_by_user_id(user_id)
         recipient = await self._user_repository.get_by_user_id(target_user_id)
 
@@ -119,6 +124,13 @@ class FriendshipService(BaseService):
         )
 
         if recipient_id != user_id:
+            logger.warning(
+                "friend_request_accept_unauthorized",
+                extra={
+                    "actor_id": str(user_id),
+                    "friendship_id": str(friendship_id),
+                },
+            )
             raise HTTPException(
                 status_code=403, detail="Not authorized to accept this request"
             )
@@ -149,6 +161,15 @@ class FriendshipService(BaseService):
                 status_code=503, detail="Friendship service unavailable"
             )
 
+        logger.info(
+            "friend_request_accepted",
+            extra={
+                "actor_id": str(user_id),
+                "friendship_id": str(friendship_id),
+                "initiator_id": str(sender_id),
+            },
+        )
+
         sender = await self._user_repository.get_by_user_id(sender_id)
         recipient = await self._user_repository.get_by_user_id(user_id)
 
@@ -181,6 +202,13 @@ class FriendshipService(BaseService):
         )
 
         if recipient_id != user_id:
+            logger.warning(
+                "friend_request_decline_unauthorized",
+                extra={
+                    "actor_id": str(user_id),
+                    "friendship_id": str(friendship_id),
+                },
+            )
             raise HTTPException(
                 status_code=403, detail="Not authorized to decline this request"
             )
@@ -210,6 +238,15 @@ class FriendshipService(BaseService):
                 status_code=503, detail="Friendship service unavailable"
             )
 
+        logger.info(
+            "friend_request_declined",
+            extra={
+                "actor_id": str(user_id),
+                "friendship_id": str(friendship_id),
+                "initiator_id": str(sender_id),
+            },
+        )
+
         sender = await self._user_repository.get_by_user_id(sender_id)
         recipient = await self._user_repository.get_by_user_id(user_id)
 
@@ -236,6 +273,13 @@ class FriendshipService(BaseService):
             raise HTTPException(status_code=404, detail="Friend request not found")
 
         if friendship.initiator_id != user_id:
+            logger.warning(
+                "friend_request_cancel_unauthorized",
+                extra={
+                    "actor_id": str(user_id),
+                    "friendship_id": str(friendship_id),
+                },
+            )
             raise HTTPException(
                 status_code=403, detail="Not authorized to cancel this request"
             )
@@ -267,6 +311,15 @@ class FriendshipService(BaseService):
             )
         recipient = await self._user_repository.get_by_user_id(recipient_id)
 
+        logger.info(
+            "friend_request_canceled",
+            extra={
+                "actor_id": str(user_id),
+                "friendship_id": str(friendship_id),
+                "target_id": str(recipient_id),
+            },
+        )
+
         return FriendRequestResponse(
             id=friendship.id,
             sender=self._build_user_basic_info(sender),
@@ -415,6 +468,15 @@ class FriendshipService(BaseService):
                 status_code=503, detail="Friendship service unavailable"
             )
 
+        logger.info(
+            "friend_removed",
+            extra={
+                "actor_id": str(user_id),
+                "friendship_id": str(friendship.id),
+                "removed_friend_id": str(friend_id),
+            },
+        )
+
         friend = await self._user_repository.get_by_user_id(friend_id)
 
         return FriendResponse(