Add ad campaign deletion functionality with confirmation prompts and error handling. Updated inline keyboards and translations for delete actions. Enhanced subscription command handler to include fallback for config link URL.

db/dal/ad_dal.py

@@ -162,3 +162,21 @@ async def get_totals(session: AsyncSession) -> Dict[str, float]:
     return {"cost": total_cost, "revenue": total_revenue}
 
 
+async def delete_campaign(session: AsyncSession, campaign_id: int) -> bool:
+    """Delete ad campaign by id along with related attributions.
+
+    Returns True if campaign existed and was deleted, False otherwise.
+    """
+    try:
+        campaign = await session.get(AdCampaign, campaign_id)
+        if not campaign:
+            return False
+        await session.delete(campaign)
+        await session.flush()
+        logging.info(f"AdCampaign deleted id={campaign_id}")
+        return True
+    except Exception as e:
+        logging.error(f"Failed to delete AdCampaign id={campaign_id}: {e}", exc_info=True)
+        raise
+
+