adds the ability to clear db

kordophoned/src/daemon/mod.rs

@@ -206,6 +206,15 @@ impl Daemon {
                 let messages = self.get_messages(conversation_id, last_message_id).await;
                 reply.send(messages).unwrap();
             },
+
+            Event::DeleteAllConversations(reply) => {
+                self.delete_all_conversations().await
+                    .unwrap_or_else(|e| {
+                        log::error!("Failed to delete all conversations: {}", e);
+                    });
+
+                reply.send(()).unwrap();
+            },
         }
     }
 
@@ -313,6 +322,18 @@ impl Daemon {
         Ok(client)
     }
 
+    async fn delete_all_conversations(&mut self) -> Result<()> {
+        self.database.with_repository(|r| -> Result<()> {
+            r.delete_all_conversations()?;
+            r.delete_all_messages()?;
+            Ok(())
+        }).await?;
+
+        self.signal_sender.send(Signal::ConversationsUpdated).await?;
+
+        Ok(())
+    }
+
     fn get_database_path() -> PathBuf {
         if let Some(proj_dirs) = ProjectDirs::from("net", "buzzert", "kordophonecd") {
             let data_dir = proj_dirs.data_dir();