diff --git a/services/identity/src/client_service.rs b/services/identity/src/client_service.rs
index 7bcfb959d..6c3531e18 100644
--- a/services/identity/src/client_service.rs
+++ b/services/identity/src/client_service.rs
@@ -1,925 +1,931 @@
 pub mod client_proto {
   tonic::include_proto!("identity.client");
 }
 
 use std::str::FromStr;
 
 use crate::database::{self, Device};
 use crate::error::Error as DBError;
 use crate::{
   client_service::client_proto::{
     AddReservedUsernamesRequest, DeleteUserRequest, Empty,
     GenerateNonceResponse, InboundKeysForUserRequest,
     InboundKeysForUserResponse, LogoutRequest, OpaqueLoginFinishRequest,
     OpaqueLoginFinishResponse, OpaqueLoginStartRequest,
     OpaqueLoginStartResponse, OutboundKeysForUserRequest,
     OutboundKeysForUserResponse, RefreshUserPreKeysRequest,
     RegistrationFinishRequest, RegistrationFinishResponse,
     RegistrationStartRequest, RegistrationStartResponse,
     RemoveReservedUsernameRequest, ReservedRegistrationStartRequest,
     UpdateUserPasswordFinishRequest, UpdateUserPasswordStartRequest,
     UpdateUserPasswordStartResponse, UploadOneTimeKeysRequest,
     VerifyUserAccessTokenRequest, VerifyUserAccessTokenResponse,
     WalletLoginRequest, WalletLoginResponse,
   },
   config::CONFIG,
   database::{DatabaseClient, KeyPayload},
   id::generate_uuid,
   nonce::generate_nonce_data,
   reserved_users::{
     validate_add_reserved_usernames_message,
     validate_remove_reserved_username_message,
     validate_signed_account_ownership_message,
   },
   siwe::parse_and_verify_siwe_message,
   token::{AccessTokenData, AuthType},
 };
 use aws_sdk_dynamodb::Error as DynamoDBError;
 pub use client_proto::identity_client_service_server::{
   IdentityClientService, IdentityClientServiceServer,
 };
 use comm_opaque2::grpc::protocol_error_to_grpc_status;
 use moka::future::Cache;
 use rand::rngs::OsRng;
 use tonic::Response;
 use tracing::{debug, error};
 
 #[derive(Clone)]
 pub enum WorkflowInProgress {
   Registration(Box<UserRegistrationInfo>),
   Login(Box<UserLoginInfo>),
   Update(UpdateState),
 }
 
 #[derive(Clone)]
 pub struct UserRegistrationInfo {
   pub username: String,
   pub flattened_device_key_upload: FlattenedDeviceKeyUpload,
 }
 
 #[derive(Clone)]
 pub struct UserLoginInfo {
   pub user_id: String,
   pub flattened_device_key_upload: FlattenedDeviceKeyUpload,
   pub opaque_server_login: comm_opaque2::server::Login,
 }
 
 #[derive(Clone)]
 pub struct UpdateState {
   pub user_id: String,
 }
 
 #[derive(Clone)]
 pub struct FlattenedDeviceKeyUpload {
   pub device_id_key: String,
   pub key_payload: String,
   pub key_payload_signature: String,
   pub content_prekey: String,
   pub content_prekey_signature: String,
   pub content_one_time_keys: Vec<String>,
   pub notif_prekey: String,
   pub notif_prekey_signature: String,
   pub notif_one_time_keys: Vec<String>,
   pub device_type: database::Device,
 }
 
 #[derive(derive_more::Constructor)]
 pub struct ClientService {
   client: DatabaseClient,
   cache: Cache<String, WorkflowInProgress>,
 }
 
 #[tonic::async_trait]
 impl IdentityClientService for ClientService {
   async fn register_password_user_start(
     &self,
     request: tonic::Request<RegistrationStartRequest>,
   ) -> Result<tonic::Response<RegistrationStartResponse>, tonic::Status> {
     let message = request.into_inner();
     debug!("Received registration request for: {}", message.username);
 
     let username_taken = self
       .client
       .username_taken(message.username.clone())
       .await
       .map_err(handle_db_error)?;
     let username_in_reserved_usernames_table = self
       .client
       .username_in_reserved_usernames_table(&message.username)
       .await
       .map_err(handle_db_error)?;
 
     if username_taken || username_in_reserved_usernames_table {
       return Err(tonic::Status::already_exists("username already exists"));
     }
 
     if CONFIG.reserved_usernames.contains(&message.username) {
       return Err(tonic::Status::invalid_argument("username reserved"));
     }
 
     if let client_proto::RegistrationStartRequest {
       opaque_registration_request: register_message,
       username,
       device_key_upload:
         Some(client_proto::DeviceKeyUpload {
           device_key_info:
             Some(client_proto::IdentityKeyInfo {
               payload,
               payload_signature,
               social_proof: _social_proof,
             }),
           content_upload:
             Some(client_proto::PreKey {
               pre_key: content_prekey,
               pre_key_signature: content_prekey_signature,
             }),
           notif_upload:
             Some(client_proto::PreKey {
               pre_key: notif_prekey,
               pre_key_signature: notif_prekey_signature,
             }),
           one_time_content_prekeys,
           one_time_notif_prekeys,
           device_type,
         }),
     } = message
     {
       let server_registration = comm_opaque2::server::Registration::new();
       let server_message = server_registration
         .start(&CONFIG.server_setup, &register_message, username.as_bytes())
         .map_err(protocol_error_to_grpc_status)?;
       let key_info = KeyPayload::from_str(&payload)
         .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
       let registration_state = UserRegistrationInfo {
         username,
         flattened_device_key_upload: FlattenedDeviceKeyUpload {
           device_id_key: key_info.primary_identity_public_keys.ed25519,
           key_payload: payload,
           key_payload_signature: payload_signature,
           content_prekey,
           content_prekey_signature,
           content_one_time_keys: one_time_content_prekeys,
           notif_prekey,
           notif_prekey_signature,
           notif_one_time_keys: one_time_notif_prekeys,
           device_type: Device::try_from(device_type)
             .map_err(handle_db_error)?,
         },
       };
       let session_id = generate_uuid();
       self
         .cache
         .insert(
           session_id.clone(),
           WorkflowInProgress::Registration(Box::new(registration_state)),
         )
         .await;
 
       let response = RegistrationStartResponse {
         session_id,
         opaque_registration_response: server_message,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::invalid_argument("unexpected message data"))
     }
   }
 
   async fn register_reserved_password_user_start(
     &self,
     request: tonic::Request<ReservedRegistrationStartRequest>,
   ) -> Result<tonic::Response<RegistrationStartResponse>, tonic::Status> {
     let message = request.into_inner();
     let username_taken = self
       .client
       .username_taken(message.username.clone())
       .await
       .map_err(handle_db_error)?;
 
     if username_taken {
       return Err(tonic::Status::already_exists("username already exists"));
     }
 
     if CONFIG.reserved_usernames.contains(&message.username) {
       return Err(tonic::Status::invalid_argument("username reserved"));
     }
 
     let username_in_reserved_usernames_table = self
       .client
       .username_in_reserved_usernames_table(&message.username)
       .await
       .map_err(handle_db_error)?;
     if username_in_reserved_usernames_table {
       validate_signed_account_ownership_message(
         &message.username,
         &message.keyserver_message,
         &message.keyserver_signature,
       )?;
     } else {
       return Err(tonic::Status::permission_denied("username not reserved"));
     }
 
     if let client_proto::ReservedRegistrationStartRequest {
       opaque_registration_request: register_message,
       username,
       device_key_upload:
         Some(client_proto::DeviceKeyUpload {
           device_key_info:
             Some(client_proto::IdentityKeyInfo {
               payload,
               payload_signature,
               social_proof: _social_proof,
             }),
           content_upload:
             Some(client_proto::PreKey {
               pre_key: content_prekey,
               pre_key_signature: content_prekey_signature,
             }),
           notif_upload:
             Some(client_proto::PreKey {
               pre_key: notif_prekey,
               pre_key_signature: notif_prekey_signature,
             }),
           one_time_content_prekeys,
           one_time_notif_prekeys,
           device_type,
         }),
       ..
     } = message
     {
       let server_registration = comm_opaque2::server::Registration::new();
       let server_message = server_registration
         .start(&CONFIG.server_setup, &register_message, username.as_bytes())
         .map_err(protocol_error_to_grpc_status)?;
       let key_info = KeyPayload::from_str(&payload)
         .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
       let registration_state = UserRegistrationInfo {
         username,
         flattened_device_key_upload: FlattenedDeviceKeyUpload {
           device_id_key: key_info.primary_identity_public_keys.ed25519,
           key_payload: payload,
           key_payload_signature: payload_signature,
           content_prekey,
           content_prekey_signature,
           content_one_time_keys: one_time_content_prekeys,
           notif_prekey,
           notif_prekey_signature,
           notif_one_time_keys: one_time_notif_prekeys,
           device_type: Device::try_from(device_type)
             .map_err(handle_db_error)?,
         },
       };
 
       let session_id = generate_uuid();
       self
         .cache
         .insert(
           session_id.clone(),
           WorkflowInProgress::Registration(Box::new(registration_state)),
         )
         .await;
 
       let response = RegistrationStartResponse {
         session_id,
         opaque_registration_response: server_message,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::invalid_argument("unexpected message data"))
     }
   }
 
   async fn register_password_user_finish(
     &self,
     request: tonic::Request<RegistrationFinishRequest>,
   ) -> Result<tonic::Response<RegistrationFinishResponse>, tonic::Status> {
     let message = request.into_inner();
 
     if let Some(WorkflowInProgress::Registration(state)) =
       self.cache.get(&message.session_id)
     {
       self.cache.invalidate(&message.session_id).await;
 
       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)?;
 
       let device_id = state.flattened_device_key_upload.device_id_key.clone();
       let user_id = self
         .client
         .add_password_user_to_users_table(*state, password_file)
         .await
         .map_err(handle_db_error)?;
 
       // Create access token
       let token = AccessTokenData::new(
         user_id.clone(),
         device_id,
         crate::token::AuthType::Password,
         &mut OsRng,
       );
 
       let access_token = token.access_token.clone();
 
       self
         .client
         .put_access_token_data(token)
         .await
         .map_err(handle_db_error)?;
 
       let response = RegistrationFinishResponse {
         user_id,
         access_token,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::not_found("session not found"))
     }
   }
 
   async fn update_user_password_start(
     &self,
     request: tonic::Request<UpdateUserPasswordStartRequest>,
   ) -> Result<tonic::Response<UpdateUserPasswordStartResponse>, tonic::Status>
   {
     let message = request.into_inner();
 
     let token_is_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id_key,
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_is_valid {
       return Err(tonic::Status::permission_denied("bad token"));
     }
 
     let server_registration = comm_opaque2::server::Registration::new();
     let server_message = server_registration
       .start(
         &CONFIG.server_setup,
         &message.opaque_registration_request,
         message.user_id.as_bytes(),
       )
       .map_err(protocol_error_to_grpc_status)?;
 
     let update_state = UpdateState {
       user_id: message.user_id,
     };
     let session_id = generate_uuid();
     self
       .cache
       .insert(session_id.clone(), WorkflowInProgress::Update(update_state))
       .await;
 
     let response = UpdateUserPasswordStartResponse {
       session_id,
       opaque_registration_response: server_message,
     };
     Ok(Response::new(response))
   }
 
   async fn update_user_password_finish(
     &self,
     request: tonic::Request<UpdateUserPasswordFinishRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     if let Some(WorkflowInProgress::Update(state)) =
       self.cache.get(&message.session_id)
     {
       self.cache.invalidate(&message.session_id).await;
 
       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
         .client
         .update_user_password(state.user_id, password_file)
         .await
         .map_err(handle_db_error)?;
 
       let response = Empty {};
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::not_found("session not found"))
     }
   }
 
   async fn login_password_user_start(
     &self,
     request: tonic::Request<OpaqueLoginStartRequest>,
   ) -> Result<tonic::Response<OpaqueLoginStartResponse>, tonic::Status> {
     let message = request.into_inner();
 
     debug!("Attempting to login user: {:?}", &message.username);
     let user_id_and_password_file = self
       .client
       .get_user_id_and_password_file_from_username(&message.username)
       .await
       .map_err(handle_db_error)?;
 
     let (user_id, password_file_bytes) =
       if let Some(data) = user_id_and_password_file {
         data
       } else {
         // It's possible that the user attempting login is already registered
         // on Ashoat's keyserver. If they are, we should send back a gRPC status
         // code instructing them to get a signed message from Ashoat's keyserver
         // in order to claim their username and register with the Identity
         // service.
         let username_in_reserved_usernames_table = self
           .client
           .username_in_reserved_usernames_table(&message.username)
           .await
           .map_err(handle_db_error)?;
 
         if username_in_reserved_usernames_table {
           return Err(tonic::Status::failed_precondition(
             "need keyserver message to claim username",
           ));
         }
 
         return Err(tonic::Status::not_found("user not found"));
       };
 
     if let client_proto::OpaqueLoginStartRequest {
       opaque_login_request: login_message,
       username,
       device_key_upload:
         Some(client_proto::DeviceKeyUpload {
           device_key_info:
             Some(client_proto::IdentityKeyInfo {
               payload,
               payload_signature,
               social_proof: _social_proof,
             }),
           content_upload:
             Some(client_proto::PreKey {
               pre_key: content_prekey,
               pre_key_signature: content_prekey_signature,
             }),
           notif_upload:
             Some(client_proto::PreKey {
               pre_key: notif_prekey,
               pre_key_signature: notif_prekey_signature,
             }),
           one_time_content_prekeys,
           one_time_notif_prekeys,
           device_type,
         }),
     } = message
     {
       let mut server_login = comm_opaque2::server::Login::new();
       let server_response = server_login
         .start(
           &CONFIG.server_setup,
           &password_file_bytes,
           &login_message,
           username.as_bytes(),
         )
         .map_err(protocol_error_to_grpc_status)?;
 
       let key_info = KeyPayload::from_str(&payload)
         .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
       let login_state = UserLoginInfo {
         user_id,
         opaque_server_login: server_login,
         flattened_device_key_upload: FlattenedDeviceKeyUpload {
           device_id_key: key_info.primary_identity_public_keys.ed25519,
           key_payload: payload,
           key_payload_signature: payload_signature,
           content_prekey,
           content_prekey_signature,
           content_one_time_keys: one_time_content_prekeys,
           notif_prekey,
           notif_prekey_signature,
           notif_one_time_keys: one_time_notif_prekeys,
           device_type: Device::try_from(device_type)
             .map_err(handle_db_error)?,
         },
       };
       let session_id = generate_uuid();
       self
         .cache
         .insert(
           session_id.clone(),
           WorkflowInProgress::Login(Box::new(login_state)),
         )
         .await;
 
       let response = Response::new(OpaqueLoginStartResponse {
         session_id,
         opaque_login_response: server_response,
       });
       Ok(response)
     } else {
       Err(tonic::Status::invalid_argument("unexpected message data"))
     }
   }
 
   async fn login_password_user_finish(
     &self,
     request: tonic::Request<OpaqueLoginFinishRequest>,
   ) -> Result<tonic::Response<OpaqueLoginFinishResponse>, tonic::Status> {
     let message = request.into_inner();
 
     if let Some(WorkflowInProgress::Login(state)) =
       self.cache.get(&message.session_id)
     {
       self.cache.invalidate(&message.session_id).await;
 
       let mut server_login = state.opaque_server_login.clone();
       server_login
         .finish(&message.opaque_login_upload)
         .map_err(protocol_error_to_grpc_status)?;
 
       self
         .client
         .add_password_user_device_to_users_table(
           state.user_id.clone(),
           state.flattened_device_key_upload.clone(),
         )
         .await
         .map_err(handle_db_error)?;
 
       // Create access token
       let token = AccessTokenData::new(
         state.user_id.clone(),
         state.flattened_device_key_upload.device_id_key,
         crate::token::AuthType::Password,
         &mut OsRng,
       );
 
       let access_token = token.access_token.clone();
 
       self
         .client
         .put_access_token_data(token)
         .await
         .map_err(handle_db_error)?;
 
       let response = OpaqueLoginFinishResponse {
         user_id: state.user_id,
         access_token,
       };
       Ok(Response::new(response))
     } else {
       Err(tonic::Status::not_found("session not found"))
     }
   }
 
   async fn login_wallet_user(
     &self,
     request: tonic::Request<WalletLoginRequest>,
   ) -> Result<tonic::Response<WalletLoginResponse>, tonic::Status> {
     let message = request.into_inner();
 
     let wallet_address = parse_and_verify_siwe_message(
       &message.siwe_message,
       &message.siwe_signature,
     )?;
 
     let (flattened_device_key_upload, social_proof) =
       if let client_proto::WalletLoginRequest {
         siwe_message: _,
         siwe_signature: _,
         device_key_upload:
           Some(client_proto::DeviceKeyUpload {
             device_key_info:
               Some(client_proto::IdentityKeyInfo {
                 payload,
                 payload_signature,
                 social_proof: Some(social_proof),
               }),
             content_upload:
               Some(client_proto::PreKey {
                 pre_key: content_prekey,
                 pre_key_signature: content_prekey_signature,
               }),
             notif_upload:
               Some(client_proto::PreKey {
                 pre_key: notif_prekey,
                 pre_key_signature: notif_prekey_signature,
               }),
             one_time_content_prekeys,
             one_time_notif_prekeys,
             device_type,
           }),
       } = message
       {
         let key_info = KeyPayload::from_str(&payload)
           .map_err(|_| tonic::Status::invalid_argument("malformed payload"))?;
         (
           FlattenedDeviceKeyUpload {
             device_id_key: key_info.primary_identity_public_keys.ed25519,
             key_payload: payload,
             key_payload_signature: payload_signature,
             content_prekey,
             content_prekey_signature,
             content_one_time_keys: one_time_content_prekeys,
             notif_prekey,
             notif_prekey_signature,
             notif_one_time_keys: one_time_notif_prekeys,
             device_type: Device::try_from(device_type)
               .map_err(handle_db_error)?,
           },
           social_proof,
         )
       } else {
         return Err(tonic::Status::invalid_argument("unexpected message data"));
       };
 
     let user_id = match self
       .client
       .get_user_id_from_user_info(wallet_address.clone(), AuthType::Wallet)
       .await
       .map_err(handle_db_error)?
     {
       Some(id) => {
         // User already exists, so we should update the DDB item
         self
           .client
           .add_wallet_user_device_to_users_table(
             id.clone(),
             flattened_device_key_upload.clone(),
             social_proof,
           )
           .await
           .map_err(handle_db_error)?;
         id
       }
       None => {
         // User doesn't exist yet, so we should add a new user in DDB
         self
           .client
           .add_wallet_user_to_users_table(
             flattened_device_key_upload.clone(),
             wallet_address,
             social_proof,
           )
           .await
           .map_err(handle_db_error)?
       }
     };
 
     // Create access token
     let token = AccessTokenData::new(
       user_id.clone(),
       flattened_device_key_upload.device_id_key,
       crate::token::AuthType::Password,
       &mut OsRng,
     );
 
     let access_token = token.access_token.clone();
 
     self
       .client
       .put_access_token_data(token)
       .await
       .map_err(handle_db_error)?;
 
     let response = WalletLoginResponse {
       user_id,
       access_token,
     };
     Ok(Response::new(response))
   }
 
   async fn log_out_user(
     &self,
     request: tonic::Request<LogoutRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let token_is_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id_key.clone(),
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_is_valid {
       return Err(tonic::Status::permission_denied("bad token"));
     }
 
     self
       .client
       .remove_device_from_users_table(
         message.user_id.clone(),
         message.device_id_key.clone(),
       )
       .await
       .map_err(handle_db_error)?;
 
     self
       .client
       .delete_access_token_data(message.user_id, message.device_id_key)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
 
     Ok(Response::new(response))
   }
 
   async fn delete_user(
     &self,
     request: tonic::Request<DeleteUserRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let token_is_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id_key,
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_is_valid {
       return Err(tonic::Status::permission_denied("bad token"));
     }
 
     self
       .client
       .delete_user(message.user_id)
       .await
       .map_err(handle_db_error)?;
 
     let response = Empty {};
 
     Ok(Response::new(response))
   }
 
   async fn generate_nonce(
     &self,
     _request: tonic::Request<Empty>,
   ) -> Result<tonic::Response<GenerateNonceResponse>, tonic::Status> {
     let nonce_data = generate_nonce_data(&mut OsRng);
     match self
       .client
       .add_nonce_to_nonces_table(nonce_data.clone())
       .await
     {
       Ok(_) => Ok(Response::new(GenerateNonceResponse {
         nonce: nonce_data.nonce,
       })),
       Err(e) => Err(handle_db_error(e)),
     }
   }
 
   async fn get_outbound_keys_for_user(
     &self,
     _request: tonic::Request<OutboundKeysForUserRequest>,
   ) -> Result<tonic::Response<OutboundKeysForUserResponse>, tonic::Status> {
     unimplemented!();
   }
 
   async fn get_inbound_keys_for_user(
     &self,
     _request: tonic::Request<InboundKeysForUserRequest>,
   ) -> Result<tonic::Response<InboundKeysForUserResponse>, tonic::Status> {
     unimplemented!();
   }
 
   async fn upload_one_time_keys(
     &self,
     request: tonic::Request<UploadOneTimeKeysRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     debug!("Validating token: {:?}", message);
     let token_valid = self
       .client
       .verify_access_token(
         message.user_id.clone(),
         message.device_id.clone(),
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     if !token_valid {
       return Err(tonic::Status::unauthenticated("Invalid token"));
     }
 
     debug!(
       "Attempting to update one time keys for user: {}",
       message.user_id
     );
     self
       .client
       .append_one_time_prekeys(
         message.device_id,
         message.content_one_time_pre_keys,
         message.notif_one_time_pre_keys,
       )
       .await
       .map_err(handle_db_error)?;
 
     Ok(tonic::Response::new(Empty {}))
   }
 
   async fn refresh_user_pre_keys(
     &self,
     _request: tonic::Request<RefreshUserPreKeysRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     unimplemented!();
   }
 
   async fn verify_user_access_token(
     &self,
     request: tonic::Request<VerifyUserAccessTokenRequest>,
   ) -> Result<tonic::Response<VerifyUserAccessTokenResponse>, tonic::Status> {
     let message = request.into_inner();
+    debug!("Verifying device: {}", &message.signing_public_key);
+
     let token_valid = self
       .client
       .verify_access_token(
         message.user_id,
-        message.signing_public_key,
+        message.signing_public_key.clone(),
         message.access_token,
       )
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(VerifyUserAccessTokenResponse { token_valid });
+    debug!(
+      "device {} was verified: {}",
+      &message.signing_public_key, token_valid
+    );
     Ok(response)
   }
 
   async fn add_reserved_usernames(
     &self,
     request: tonic::Request<AddReservedUsernamesRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let usernames = validate_add_reserved_usernames_message(
       &message.message,
       &message.signature,
     )?;
 
     let filtered_usernames = self
       .client
       .filter_out_taken_usernames(usernames)
       .await
       .map_err(handle_db_error)?;
 
     self
       .client
       .add_usernames_to_reserved_usernames_table(filtered_usernames)
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(Empty {});
     Ok(response)
   }
 
   async fn remove_reserved_username(
     &self,
     request: tonic::Request<RemoveReservedUsernameRequest>,
   ) -> Result<tonic::Response<Empty>, tonic::Status> {
     let message = request.into_inner();
 
     let username = validate_remove_reserved_username_message(
       &message.message,
       &message.signature,
     )?;
 
     self
       .client
       .delete_username_from_reserved_usernames_table(username)
       .await
       .map_err(handle_db_error)?;
 
     let response = Response::new(Empty {});
     Ok(response)
   }
 }
 
 pub fn handle_db_error(db_error: DBError) -> tonic::Status {
   match db_error {
     DBError::AwsSdk(DynamoDBError::InternalServerError(_))
     | DBError::AwsSdk(DynamoDBError::ProvisionedThroughputExceededException(
       _,
     ))
     | DBError::AwsSdk(DynamoDBError::RequestLimitExceeded(_)) => {
       tonic::Status::unavailable("please retry")
     }
     e => {
       error!("Encountered an unexpected error: {}", e);
       tonic::Status::failed_precondition("unexpected error")
     }
   }
 }