add telegram post creation feature but experimental

src/database/models.py

@@ -103,6 +103,22 @@ class LinkedInAccount(DBModel):
     last_error_at: Optional[datetime] = None
 
 
+class TelegramAccount(DBModel):
+    """Telegram account connection for bot access."""
+    id: Optional[UUID] = None
+    user_id: UUID
+    created_at: Optional[datetime] = None
+    updated_at: Optional[datetime] = None
+    telegram_user_id: str
+    telegram_username: Optional[str] = None
+    telegram_first_name: Optional[str] = None
+    telegram_chat_id: str
+    is_active: bool = True
+    last_used_at: Optional[datetime] = None
+    last_error: Optional[str] = None
+    last_error_at: Optional[datetime] = None
+
+
 class User(DBModel):
     """User model - combines auth.users data with profile data.