diff --git a/services/identity/src/grpc_services/authenticated.rs b/services/identity/src/grpc_services/authenticated.rs
index 7a72edb83..c2eb7e73a 100644
--- a/services/identity/src/grpc_services/authenticated.rs
+++ b/services/identity/src/grpc_services/authenticated.rs
@@ -1,998 +1,979 @@
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 
 use crate::config::CONFIG;
 use crate::database::{DeviceListUpdate, PlatformDetails};
 use crate::device_list::validation::DeviceListValidator;
 use crate::device_list::SignedDeviceList;
 use crate::error::consume_error;
 use crate::log::redact_sensitive_data;
 use crate::{
   client_service::{handle_db_error, WorkflowInProgress},
   constants::{error_types, request_metadata, tonic_status_messages},
   database::DatabaseClient,
   grpc_services::shared::{get_platform_metadata, get_value},
 };
 use chrono::DateTime;
 use comm_opaque2::grpc::protocol_error_to_grpc_status;
 use tonic::{Request, Response, Status};
 use tracing::{debug, error, trace, warn};
 
 use super::protos::auth::{
   identity_client_service_server::IdentityClientService,
   DeletePasswordUserFinishRequest, DeletePasswordUserStartRequest,
   DeletePasswordUserStartResponse, GetDeviceListRequest, GetDeviceListResponse,
   InboundKeyInfo, InboundKeysForUserRequest, InboundKeysForUserResponse,
   KeyserverKeysResponse, LinkFarcasterAccountRequest, OutboundKeyInfo,
   OutboundKeysForUserRequest, OutboundKeysForUserResponse,
   PeersDeviceListsRequest, PeersDeviceListsResponse,
   PrimaryDeviceLogoutRequest, RefreshUserPrekeysRequest,
   UpdateDeviceListRequest, UpdateUserPasswordFinishRequest,
   UpdateUserPasswordStartRequest, UpdateUserPasswordStartResponse,
   UploadOneTimeKeysRequest, UserDevicesPlatformDetails, UserIdentitiesRequest,
   UserIdentitiesResponse,
 };
 use super::protos::unauth::Empty;
 
 #[derive(derive_more::Constructor)]
 pub struct AuthenticatedService {
   db_client: DatabaseClient,
 }
 
 fn get_auth_info(req: &Request<()>) -> Option<(String, String, String)> {
   trace!("Retrieving auth info for request: {:?}", req);
 
   let user_id = get_value(req, request_metadata::USER_ID)?;
   let device_id = get_value(req, request_metadata::DEVICE_ID)?;
   let access_token = get_value(req, request_metadata::ACCESS_TOKEN)?;
 
   Some((user_id, device_id, access_token))
 }
 
 pub fn auth_interceptor(
   req: Request<()>,
   db_client: &DatabaseClient,
 ) -> Result<Request<()>, Status> {
   trace!("Intercepting request to check auth info: {:?}", req);
 
   let (user_id, device_id, access_token) =
     get_auth_info(&req).ok_or_else(|| {
       Status::unauthenticated(tonic_status_messages::MISSING_CREDENTIALS)
     })?;
 
   let handle = tokio::runtime::Handle::current();
   let new_db_client = db_client.clone();
 
   // This function cannot be `async`, yet must call the async db call
   // Force tokio to resolve future in current thread without an explicit .await
   let valid_token = tokio::task::block_in_place(move || {
     handle
       .block_on(new_db_client.verify_access_token(
         user_id,
         device_id,
         access_token,
       ))
       .map_err(handle_db_error)
   })?;
 
   if !valid_token {
     return Err(Status::aborted(tonic_status_messages::BAD_CREDENTIALS));
   }
 
   Ok(req)
 }
 
 pub fn get_user_and_device_id<T>(
   request: &Request<T>,
 ) -> Result<(String, String), Status> {
   let user_id =
     get_value(request, request_metadata::USER_ID).ok_or_else(|| {
       Status::unauthenticated(tonic_status_messages::USER_ID_MISSING)
     })?;
   let device_id =
     get_value(request, request_metadata::DEVICE_ID).ok_or_else(|| {
       Status::unauthenticated(tonic_status_messages::DEVICE_ID_MISSING)
     })?;
 
   Ok((user_id, device_id))
 }
 
 fn spawn_delete_tunnelbroker_data_task(device_ids: Vec<String>) {
   tokio::spawn(async move {
     debug!(
       "Attempting to delete Tunnelbroker data for devices: {:?}",
       device_ids.as_slice()
     );
     let result = crate::tunnelbroker::delete_devices_data(&device_ids).await;
     consume_error(result);
   });
 }
 
 #[tonic::async_trait]
 impl IdentityClientService for AuthenticatedService {
   #[tracing::instrument(skip_all)]
   async fn refresh_user_prekeys(
     &self,
     request: Request<RefreshUserPrekeysRequest>,
   ) -> Result<Response<Empty>, Status> {
     let (user_id, device_id) = get_user_and_device_id(&request)?;
     let message = request.into_inner();
 
     debug!("Refreshing prekeys for user: {}", user_id);
 
     let content_key = message.new_content_prekey.ok_or_else(|| {
       Status::invalid_argument(tonic_status_messages::MISSING_CONTENT_KEYS)
     })?;
     let notif_key = message.new_notif_prekey.ok_or_else(|| {
       Status::invalid_argument(tonic_status_messages::MISSING_NOTIF_KEYS)
     })?;
 
     self
       .db_client
       .update_device_prekeys(
         user_id,
         device_id,
         content_key.into(),
         notif_key.into(),
       )
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(Empty {});
     Ok(response)
   }
 
   #[tracing::instrument(skip_all)]
   async fn get_outbound_keys_for_user(
     &self,
     request: tonic::Request<OutboundKeysForUserRequest>,
   ) -> Result<tonic::Response<OutboundKeysForUserResponse>, tonic::Status> {
     let message = request.into_inner();
     let user_id = &message.user_id;
 
     let devices_map = self
       .db_client
       .get_keys_for_user(user_id, true)
       .await
       .map_err(handle_db_error)?
       .ok_or_else(|| {
         tonic::Status::not_found(tonic_status_messages::USER_NOT_FOUND)
       })?;
 
     let transformed_devices = devices_map
       .into_iter()
       .map(|(key, device_info)| (key, OutboundKeyInfo::from(device_info)))
       .collect::<HashMap<_, _>>();
 
     Ok(tonic::Response::new(OutboundKeysForUserResponse {
       devices: transformed_devices,
     }))
   }
 
   #[tracing::instrument(skip_all)]
   async fn get_inbound_keys_for_user(
     &self,
     request: tonic::Request<InboundKeysForUserRequest>,
   ) -> Result<tonic::Response<InboundKeysForUserResponse>, tonic::Status> {
     let message = request.into_inner();
     let user_id = &message.user_id;
 
     let devices_map = self
       .db_client
       .get_keys_for_user(user_id, false)
       .await
       .map_err(handle_db_error)?
       .ok_or_else(|| {
         tonic::Status::not_found(tonic_status_messages::USER_NOT_FOUND)
       })?;
 
     let transformed_devices = devices_map
       .into_iter()
       .map(|(key, device_info)| (key, InboundKeyInfo::from(device_info)))
       .collect::<HashMap<_, _>>();
 
     let identifier = self
       .db_client
       .get_user_identity(user_id)
       .await
       .map_err(handle_db_error)?
       .ok_or_else(|| {
         tonic::Status::not_found(tonic_status_messages::USER_NOT_FOUND)
       })?;
 
     Ok(tonic::Response::new(InboundKeysForUserResponse {
       devices: transformed_devices,
       identity: Some(identifier.into()),
     }))
   }
 
   #[tracing::instrument(skip_all)]
   async fn get_keyserver_keys(
     &self,
     request: Request<OutboundKeysForUserRequest>,
   ) -> Result<Response<KeyserverKeysResponse>, Status> {
     let message = request.into_inner();
 
     let identifier = self
       .db_client
       .get_user_identity(&message.user_id)
       .await
       .map_err(handle_db_error)?
       .ok_or_else(|| {
         tonic::Status::not_found(tonic_status_messages::USER_NOT_FOUND)
       })?;
 
     let Some(keyserver_info) = self
       .db_client
       .get_keyserver_keys_for_user(&message.user_id)
       .await
       .map_err(handle_db_error)?
     else {
       return Err(Status::not_found(
         tonic_status_messages::KEYSERVER_NOT_FOUND,
       ));
     };
 
     let primary_device_data = self
       .db_client
       .get_primary_device_data(&message.user_id)
       .await
       .map_err(handle_db_error)?;
     let primary_device_keys = primary_device_data.device_key_info;
 
     let response = Response::new(KeyserverKeysResponse {
       keyserver_info: Some(keyserver_info.into()),
       identity: Some(identifier.into()),
       primary_device_identity_info: Some(primary_device_keys.into()),
     });
 
     return Ok(response);
   }
 
   #[tracing::instrument(skip_all)]
   async fn upload_one_time_keys(
     &self,
     request: tonic::Request<UploadOneTimeKeysRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let (user_id, device_id) = get_user_and_device_id(&request)?;
     let message = request.into_inner();
 
     debug!("Attempting to update one time keys for user: {}", user_id);
     self
       .db_client
       .append_one_time_prekeys(
         &user_id,
         &device_id,
         &message.content_one_time_prekeys,
         &message.notif_one_time_prekeys,
       )
       .await
       .map_err(handle_db_error)?;
 
     Ok(tonic::Response::new(Empty {}))
   }
 
   #[tracing::instrument(skip_all)]
   async fn update_user_password_start(
     &self,
     request: tonic::Request<UpdateUserPasswordStartRequest>,
   ) -> Result<tonic::Response<UpdateUserPasswordStartResponse>, tonic::Status>
   {
     let (user_id, _) = get_user_and_device_id(&request)?;
 
     let Some((username, password_file)) = self
       .db_client
       .get_username_and_password_file(&user_id)
       .await
       .map_err(handle_db_error)?
     else {
       return Err(tonic::Status::permission_denied(
         tonic_status_messages::WALLET_USER,
       ));
     };
 
     let message = request.into_inner();
 
     let mut server_login = comm_opaque2::server::Login::new();
     let login_response = server_login
       .start(
         &CONFIG.server_setup,
         &password_file,
         &message.opaque_login_request,
         username.as_bytes(),
       )
       .map_err(protocol_error_to_grpc_status)?;
 
     let server_registration = comm_opaque2::server::Registration::new();
     let registration_response = server_registration
       .start(
         &CONFIG.server_setup,
         &message.opaque_registration_request,
         username.as_bytes(),
       )
       .map_err(protocol_error_to_grpc_status)?;
 
     let update_state = UpdatePasswordInfo::new(server_login);
     let session_id = self
       .db_client
       .insert_workflow(WorkflowInProgress::Update(Box::new(update_state)))
       .await
       .map_err(handle_db_error)?;
 
     let response = UpdateUserPasswordStartResponse {
       session_id,
       opaque_registration_response: registration_response,
       opaque_login_response: login_response,
     };
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn update_user_password_finish(
     &self,
     request: tonic::Request<UpdateUserPasswordFinishRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let (user_id, _) = get_user_and_device_id(&request)?;
 
     let message = request.into_inner();
 
     let Some(WorkflowInProgress::Update(state)) = self
       .db_client
       .get_workflow(message.session_id)
       .await
       .map_err(handle_db_error)?
     else {
       return Err(tonic::Status::not_found(
         tonic_status_messages::SESSION_NOT_FOUND,
       ));
     };
 
     let mut server_login = state.opaque_server_login;
     server_login
       .finish(&message.opaque_login_upload)
       .map_err(protocol_error_to_grpc_status)?;
 
     let server_registration = comm_opaque2::server::Registration::new();
     let password_file = server_registration
       .finish(&message.opaque_registration_upload)
       .map_err(protocol_error_to_grpc_status)?;
 
     self
       .db_client
       .update_user_password(user_id, password_file)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn log_out_user(
     &self,
     request: tonic::Request<Empty>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let (user_id, device_id) = get_user_and_device_id(&request)?;
 
     self
       .db_client
       .remove_device(&user_id, &device_id)
       .await
       .map_err(handle_db_error)?;
 
     self
       .db_client
       .delete_otks_table_rows_for_user_device(&user_id, &device_id)
       .await
       .map_err(handle_db_error)?;
 
     self
       .db_client
       .delete_access_token_data(&user_id, &device_id)
       .await
       .map_err(handle_db_error)?;
 
     let device_list = self
       .db_client
       .get_current_device_list(&user_id)
       .await
       .map_err(|err| {
         error!(
           user_id = redact_sensitive_data(&user_id),
           errorType = error_types::GRPC_SERVICES_LOG,
           "Failed fetching device list: {err}"
         );
         handle_db_error(err)
       })?;
 
     let Some(device_list) = device_list else {
       error!(
         user_id = redact_sensitive_data(&user_id),
         errorType = error_types::GRPC_SERVICES_LOG,
         "User has no device list!"
       );
       return Err(Status::failed_precondition("no device list"));
     };
 
     tokio::spawn(async move {
       debug!(
         "Sending device list updates to {:?}",
         device_list.device_ids
       );
       let device_ids: Vec<&str> =
         device_list.device_ids.iter().map(AsRef::as_ref).collect();
       let result =
         crate::tunnelbroker::send_device_list_update(&device_ids).await;
       consume_error(result);
     });
 
     spawn_delete_tunnelbroker_data_task([device_id].into());
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn log_out_primary_device(
     &self,
     request: tonic::Request<PrimaryDeviceLogoutRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let (user_id, device_id) = get_user_and_device_id(&request)?;
     let message = request.into_inner();
 
     debug!(
       "Primary device logout request for user_id={}, device_id={}",
       user_id, device_id
     );
     self
       .verify_device_on_device_list(
         &user_id,
         &device_id,
         DeviceListItemKind::Primary,
       )
       .await?;
 
     // Get and verify singleton device list
     let parsed_device_list: SignedDeviceList =
       message.signed_device_list.parse().map_err(|err| {
         warn!("Failed to deserialize device list: {}", err);
         tonic::Status::invalid_argument(
           tonic_status_messages::INVALID_DEVICE_LIST_PAYLOAD,
         )
       })?;
 
     let update_payload = DeviceListUpdate::try_from(parsed_device_list)?;
     crate::device_list::verify_singleton_device_list(
       &update_payload,
       &device_id,
     )?;
 
     self
       .db_client
       .apply_devicelist_update(
         &user_id,
         update_payload,
         // - We've already validated the list so no need to do it here.
         // - Need to pass the type because it cannot be inferred from None
         None::<DeviceListValidator>,
         // We don't want side effects - we'll take care of removing devices
         // on our own. (Side effect would skip the primary device).
         false,
       )
       .await
       .map_err(handle_db_error)?;
 
     debug!(user_id, "Attempting to delete user's access tokens");
     self
       .db_client
       .delete_all_tokens_for_user(&user_id)
       .await
       .map_err(handle_db_error)?;
 
     // We must delete the one-time keys first because doing so requires device
     // IDs from the devices table
     debug!(user_id, "Attempting to delete user's one-time keys");
     self
       .db_client
       .delete_otks_table_rows_for_user(&user_id)
       .await
       .map_err(handle_db_error)?;
 
     debug!(user_id, "Attempting to delete user's devices");
     let device_ids = self
       .db_client
       .delete_devices_data_for_user(&user_id)
       .await
       .map_err(handle_db_error)?;
 
     spawn_delete_tunnelbroker_data_task(device_ids);
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn log_out_secondary_device(
     &self,
     request: tonic::Request<Empty>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let (user_id, device_id) = get_user_and_device_id(&request)?;
 
     debug!(
       "Secondary device logout request for user_id={}, device_id={}",
       user_id, device_id
     );
     self
       .verify_device_on_device_list(
         &user_id,
         &device_id,
         DeviceListItemKind::Secondary,
       )
       .await?;
 
     self
       .db_client
       .delete_access_token_data(&user_id, &device_id)
       .await
       .map_err(handle_db_error)?;
 
     self
       .db_client
       .delete_otks_table_rows_for_user_device(&user_id, &device_id)
       .await
       .map_err(handle_db_error)?;
 
     spawn_delete_tunnelbroker_data_task([device_id].into());
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn delete_wallet_user(
     &self,
     request: tonic::Request<Empty>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let (user_id, _) = get_user_and_device_id(&request)?;
 
     debug!("Attempting to delete wallet user: {}", user_id);
 
     let user_is_password_authenticated = self
       .db_client
       .user_is_password_authenticated(&user_id)
       .await
       .map_err(handle_db_error)?;
 
     if user_is_password_authenticated {
       return Err(tonic::Status::permission_denied(
         tonic_status_messages::PASSWORD_USER,
       ));
     }
 
     self
       .db_client
       .delete_user(user_id)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn delete_password_user_start(
     &self,
     request: tonic::Request<DeletePasswordUserStartRequest>,
   ) -> Result<tonic::Response<DeletePasswordUserStartResponse>, tonic::Status>
   {
     let (user_id, _) = get_user_and_device_id(&request)?;
     let message = request.into_inner();
 
     debug!("Attempting to start deleting password user: {}", user_id);
     let maybe_username_and_password_file = self
       .db_client
       .get_username_and_password_file(&user_id)
       .await
       .map_err(handle_db_error)?;
 
     let Some((username, password_file_bytes)) =
       maybe_username_and_password_file
     else {
       return Err(tonic::Status::not_found(
         tonic_status_messages::USER_NOT_FOUND,
       ));
     };
 
     let mut server_login = comm_opaque2::server::Login::new();
     let server_response = server_login
       .start(
         &CONFIG.server_setup,
         &password_file_bytes,
         &message.opaque_login_request,
         username.as_bytes(),
       )
       .map_err(protocol_error_to_grpc_status)?;
 
     let delete_state = DeletePasswordUserInfo::new(server_login);
 
     let session_id = self
       .db_client
       .insert_workflow(WorkflowInProgress::PasswordUserDeletion(Box::new(
         delete_state,
       )))
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(DeletePasswordUserStartResponse {
       session_id,
       opaque_login_response: server_response,
     });
     Ok(response)
   }
 
   #[tracing::instrument(skip_all)]
   async fn delete_password_user_finish(
     &self,
     request: tonic::Request<DeletePasswordUserFinishRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let (user_id, _) = get_user_and_device_id(&request)?;
     let message = request.into_inner();
 
     debug!("Attempting to finish deleting password user: {}", user_id);
     let Some(WorkflowInProgress::PasswordUserDeletion(state)) = self
       .db_client
       .get_workflow(message.session_id)
       .await
       .map_err(handle_db_error)?
     else {
       return Err(tonic::Status::not_found(
         tonic_status_messages::SESSION_NOT_FOUND,
       ));
     };
 
     let mut server_login = state.opaque_server_login;
     server_login
       .finish(&message.opaque_login_upload)
       .map_err(protocol_error_to_grpc_status)?;
 
     self
       .db_client
       .delete_user(user_id)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn get_device_list_for_user(
     &self,
     request: tonic::Request<GetDeviceListRequest>,
   ) -> Result<tonic::Response<GetDeviceListResponse>, tonic::Status> {
     let GetDeviceListRequest {
       user_id,
       since_timestamp,
     } = request.into_inner();
 
     let since = since_timestamp
       .map(|timestamp| {
         DateTime::from_timestamp_millis(timestamp).ok_or_else(|| {
           tonic::Status::invalid_argument(
             tonic_status_messages::INVALID_TIMESTAMP,
           )
         })
       })
       .transpose()?;
 
     let mut db_result = self
       .db_client
       .get_device_list_history(user_id, since)
       .await
       .map_err(handle_db_error)?;
 
     // these should be sorted already, but just in case
     db_result.sort_by_key(|list| list.timestamp);
 
     let device_list_updates: Vec<SignedDeviceList> = db_result
       .into_iter()
       .map(SignedDeviceList::try_from)
       .collect::<Result<Vec<_>, _>>()?;
 
     let stringified_updates = device_list_updates
       .iter()
       .map(SignedDeviceList::as_json_string)
       .collect::<Result<Vec<_>, _>>()?;
 
     Ok(Response::new(GetDeviceListResponse {
       device_list_updates: stringified_updates,
     }))
   }
 
   #[tracing::instrument(skip_all)]
   async fn get_device_lists_for_users(
     &self,
     request: tonic::Request<PeersDeviceListsRequest>,
   ) -> Result<tonic::Response<PeersDeviceListsResponse>, tonic::Status> {
     let PeersDeviceListsRequest { user_ids } = request.into_inner();
-    use crate::database::{DeviceListRow, DeviceRow};
-
-    async fn get_current_device_list_and_data(
-      db_client: DatabaseClient,
-      user_id: &str,
-    ) -> Result<(Option<DeviceListRow>, Vec<DeviceRow>), crate::error::Error>
-    {
-      let (list_result, data_result) = tokio::join!(
-        db_client.get_current_device_list(user_id),
-        db_client.get_current_devices(user_id)
-      );
-      Ok((list_result?, data_result?))
-    }
+    let request_count = user_ids.len();
+    let user_ids: HashSet<String> = user_ids.into_iter().collect();
+    debug!(
+      "Requesting device lists and platform details for {} users ({} unique)",
+      request_count,
+      user_ids.len()
+    );
 
-    // do all fetches concurrently
-    let mut fetch_tasks = tokio::task::JoinSet::new();
-    let mut device_lists = HashMap::with_capacity(user_ids.len());
-    let mut users_devices_platform_details =
-      HashMap::with_capacity(user_ids.len());
-    for user_id in user_ids {
-      let db_client = self.db_client.clone();
-      fetch_tasks.spawn(async move {
-        let result =
-          get_current_device_list_and_data(db_client, &user_id).await;
-        (user_id, result)
-      });
-    }
+    // 1. Fetch device lists
+    let device_lists = self
+      .db_client
+      .get_current_device_lists(user_ids)
+      .await
+      .map_err(handle_db_error)?;
+    trace!("Found device lists for {} users", device_lists.keys().len());
 
-    while let Some(task_result) = fetch_tasks.join_next().await {
-      match task_result {
-        Ok((user_id, Ok((device_list, devices_data)))) => {
-          let Some(device_list_row) = device_list else {
-            warn!(
-              user_id = redact_sensitive_data(&user_id),
-              "User has no device list, skipping!"
-            );
-            continue;
-          };
-          let signed_list = SignedDeviceList::try_from(device_list_row)?;
-          let serialized_list = signed_list.as_json_string()?;
-          device_lists.insert(user_id.clone(), serialized_list);
-
-          let devices_platform_details = devices_data
-            .into_iter()
-            .map(|data| (data.device_id, data.platform_details.into()))
-            .collect();
-          users_devices_platform_details.insert(
-            user_id,
-            UserDevicesPlatformDetails {
-              devices_platform_details,
-            },
-          );
-        }
-        Ok((user_id, Err(err))) => {
-          error!(
-            user_id = redact_sensitive_data(&user_id),
-            errorType = error_types::GRPC_SERVICES_LOG,
-            "Failed fetching device list: {err}"
-          );
-          // abort fetching other users
-          fetch_tasks.abort_all();
-          return Err(handle_db_error(err));
-        }
-        Err(join_error) => {
-          error!(
-            errorType = error_types::GRPC_SERVICES_LOG,
-            "Failed to join device list task: {join_error}"
-          );
-          fetch_tasks.abort_all();
-          return Err(Status::aborted(tonic_status_messages::UNEXPECTED_ERROR));
-        }
-      }
-    }
+    // 2. Fetch platform details
+    let flattened_user_device_ids: Vec<(String, String)> = device_lists
+      .iter()
+      .flat_map(|(user_id, device_list)| {
+        device_list
+          .device_ids
+          .iter()
+          .map(|device_id| (user_id.clone(), device_id.clone()))
+          .collect::<Vec<_>>()
+      })
+      .collect();
+
+    let platform_details = self
+      .db_client
+      .get_devices_platform_details(flattened_user_device_ids)
+      .await
+      .map_err(handle_db_error)?;
+    trace!(
+      "Found platform details for {} users",
+      platform_details.keys().len()
+    );
+
+    // 3. Prepare output format
+    let users_device_lists: HashMap<String, String> = device_lists
+      .into_iter()
+      .map(|(user_id, device_list_row)| {
+        let signed_list = SignedDeviceList::try_from(device_list_row)?;
+        let serialized_list = signed_list.as_json_string()?;
+        Ok((user_id, serialized_list))
+      })
+      .collect::<Result<_, tonic::Status>>()?;
+
+    let users_devices_platform_details = platform_details
+      .into_iter()
+      .map(|(user_id, devices_map)| {
+        (user_id, UserDevicesPlatformDetails::from(devices_map))
+      })
+      .collect();
 
     let response = PeersDeviceListsResponse {
-      users_device_lists: device_lists,
+      users_device_lists,
       users_devices_platform_details,
     };
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn update_device_list(
     &self,
     request: tonic::Request<UpdateDeviceListRequest>,
   ) -> Result<Response<Empty>, tonic::Status> {
     let (user_id, _device_id) = get_user_and_device_id(&request)?;
     // TODO: when we stop doing "primary device rotation" (migration procedure)
     // we should verify if this RPC is called by primary device only
 
     let new_list = SignedDeviceList::try_from(request.into_inner())?;
     let update = DeviceListUpdate::try_from(new_list)?;
     let validator =
       crate::device_list::validation::update_device_list_rpc_validator;
     self
       .db_client
       .apply_devicelist_update(&user_id, update, Some(validator), true)
       .await
       .map_err(handle_db_error)?;
 
     Ok(Response::new(Empty {}))
   }
 
   #[tracing::instrument(skip_all)]
   async fn link_farcaster_account(
     &self,
     request: tonic::Request<LinkFarcasterAccountRequest>,
   ) -> Result<Response<Empty>, tonic::Status> {
     let (user_id, _) = get_user_and_device_id(&request)?;
     let message = request.into_inner();
 
     let mut get_farcaster_users_response = self
       .db_client
       .get_farcaster_users(vec![message.farcaster_id.clone()])
       .await
       .map_err(handle_db_error)?;
 
     if get_farcaster_users_response.len() > 1 {
       error!(
         errorType = error_types::GRPC_SERVICES_LOG,
         "multiple users associated with the same Farcaster ID"
       );
       return Err(Status::failed_precondition(
         tonic_status_messages::CANNOT_LINK_FID,
       ));
     }
 
     if let Some(u) = get_farcaster_users_response.pop() {
       if u.0.user_id == user_id {
         return Ok(Response::new(Empty {}));
       } else {
         return Err(Status::already_exists(tonic_status_messages::FID_TAKEN));
       }
     }
 
     self
       .db_client
       .add_farcaster_id(user_id, message.farcaster_id)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn unlink_farcaster_account(
     &self,
     request: tonic::Request<Empty>,
   ) -> Result<Response<Empty>, tonic::Status> {
     let (user_id, _) = get_user_and_device_id(&request)?;
 
     self
       .db_client
       .remove_farcaster_id(user_id)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
     Ok(Response::new(response))
   }
 
   #[tracing::instrument(skip_all)]
   async fn find_user_identities(
     &self,
     request: tonic::Request<UserIdentitiesRequest>,
   ) -> Result<Response<UserIdentitiesResponse>, tonic::Status> {
     let message = request.into_inner();
 
     let results = self
       .db_client
       .find_db_user_identities(message.user_ids)
       .await
       .map_err(handle_db_error)?;
 
     let mapped_results = results
       .into_iter()
       .map(|(user_id, identifier)| (user_id, identifier.into()))
       .collect();
 
     let response = UserIdentitiesResponse {
       identities: mapped_results,
     };
     return Ok(Response::new(response));
   }
 
   #[tracing::instrument(skip_all)]
   async fn sync_platform_details(
     &self,
     request: tonic::Request<Empty>,
   ) -> Result<Response<Empty>, tonic::Status> {
     let (user_id, device_id) = get_user_and_device_id(&request)?;
     let platform_metadata = get_platform_metadata(&request)?;
     let platform_details = PlatformDetails::new(platform_metadata, None)
       .map_err(|_| {
         Status::invalid_argument(
           tonic_status_messages::INVALID_PLATFORM_METADATA,
         )
       })?;
 
     self
       .db_client
       .update_device_platform_details(user_id, device_id, platform_details)
       .await
       .map_err(handle_db_error)?;
 
     Ok(Response::new(Empty {}))
   }
 }
 
 #[allow(dead_code)]
 enum DeviceListItemKind {
   Any,
   Primary,
   Secondary,
 }
 
 impl AuthenticatedService {
   async fn verify_device_on_device_list(
     &self,
     user_id: &String,
     device_id: &String,
     device_kind: DeviceListItemKind,
   ) -> Result<(), tonic::Status> {
     let device_list = self
       .db_client
       .get_current_device_list(user_id)
       .await
       .map_err(|err| {
         error!(
           user_id = redact_sensitive_data(user_id),
           errorType = error_types::GRPC_SERVICES_LOG,
           "Failed fetching device list: {err}"
         );
         handle_db_error(err)
       })?;
 
     let Some(device_list) = device_list else {
       error!(
         user_id = redact_sensitive_data(user_id),
         errorType = error_types::GRPC_SERVICES_LOG,
         "User has no device list!"
       );
       return Err(Status::failed_precondition(
         tonic_status_messages::NO_DEVICE_LIST,
       ));
     };
 
     use DeviceListItemKind as DeviceKind;
     let device_on_list = match device_kind {
       DeviceKind::Any => device_list.has_device(device_id),
       DeviceKind::Primary => device_list.is_primary_device(device_id),
       DeviceKind::Secondary => device_list.has_secondary_device(device_id),
     };
 
     if !device_on_list {
       debug!(
         "Device {} not in device list for user {}",
         device_id, user_id
       );
       return Err(Status::permission_denied(
         tonic_status_messages::DEVICE_NOT_IN_DEVICE_LIST,
       ));
     }
 
     Ok(())
   }
 }
 
 #[derive(
   Clone, serde::Serialize, serde::Deserialize, derive_more::Constructor,
 )]
 pub struct DeletePasswordUserInfo {
   pub opaque_server_login: comm_opaque2::server::Login,
 }
 
 #[derive(
   Clone, serde::Serialize, serde::Deserialize, derive_more::Constructor,
 )]
 pub struct UpdatePasswordInfo {
   pub opaque_server_login: comm_opaque2::server::Login,
 }