feat: track received image outcomes

src/database/client.ts

@@ -192,6 +192,12 @@ export function runMigrations(db: Database.Database): void {
         updated_at INTEGER NOT NULL
       );
     `),
+    () => {
+      addColumnIfNotExists(db, 'sent_messages', 'got_image', 'INTEGER NOT NULL DEFAULT 0');
+      db.exec(`
+        CREATE INDEX IF NOT EXISTS idx_sent_messages_image ON sent_messages(got_image);
+      `);
+    },
   ];
 
   let currentVersion = db.pragma('user_version', { simple: true }) as number;