per-campaign settings, default campaign folders, custom prompt fix

backend/app/routers/campaigns.py

@@ -1,6 +1,6 @@
 from fastapi import APIRouter, HTTPException
 
-from .. import database as db
+from .. import database as db, config
 
 router = APIRouter(prefix="/api/campaigns", tags=["campaigns"])
 
@@ -45,3 +45,24 @@ def delete_campaign(campaign_id: str):
         raise HTTPException(404, "Campaign not found")
     db.delete_campaign(campaign_id)
     return {"ok": True}
+
+
+@router.get("/{campaign_id}/settings")
+def get_campaign_settings(campaign_id: str):
+    if not db.get_campaign(campaign_id):
+        raise HTTPException(404, "Campaign not found")
+    raw = db.get_campaign_settings(campaign_id)
+    # return defaults for any missing keys
+    merged = {**config.CAMPAIGN_SETTINGS, **raw}
+    return merged
+
+
+@router.post("/{campaign_id}/settings")
+def update_campaign_settings(campaign_id: str, body: dict):
+    if not db.get_campaign(campaign_id):
+        raise HTTPException(404, "Campaign not found")
+    clean = {k: str(v) for k, v in body.items() if k in config.CAMPAIGN_SETTINGS}
+    db.update_campaign_settings(campaign_id, clean)
+    raw = db.get_campaign_settings(campaign_id)
+    merged = {**config.CAMPAIGN_SETTINGS, **raw}
+    return merged