Limit scan fallback to editor metadata

backend/app.py

@@ -62,7 +62,7 @@ EXIF_TYPE_ORDER = (
 )
 EXIF_TYPE_TO_CODE = {name: idx + 1 for idx, name in enumerate(EXIF_TYPE_ORDER)}
 EXIF_CODE_TO_TYPE = {idx + 1: name for idx, name in enumerate(EXIF_TYPE_ORDER)}
-PRIMARY_EXIF_TYPES = {"novelai", "comfy", "sd"}
+FALLBACK_EXIF_TYPES = {"celsys", "photoshop"}
 POST_SCAN_LIMIT = 64
 EXIF_RANGE_LIMIT = 96
 EXIF_RANGE_BYTES = 16384
@@ -1342,16 +1342,18 @@ async def scan_post(post_id, session, post_sem, exif_sem, img_sem):
             for url in image_urls:
                 metadata = await get_exif_range(url, session, exif_sem)
                 exif_type = determine_exif_type(metadata)
-                if exif_type in PRIMARY_EXIF_TYPES:
+                if exif_type in FALLBACK_EXIF_TYPES:
+                    if fallback is None:
+                        fallback = post_id, url, EXIF_TYPE_TO_CODE.get(exif_type)
+                    continue
+                if exif_type:
                     return post_id, url, EXIF_TYPE_TO_CODE.get(exif_type)
-                if exif_type and fallback is None:
-                    fallback = post_id, url, EXIF_TYPE_TO_CODE.get(exif_type)
-            if fallback:
-                return fallback
             for url in image_urls:
                 img_data = await fetch_image(session, url, img_sem)
                 if img_data and has_stealth_png_bytes(img_data):
                     return post_id, url, EXIF_TYPE_TO_CODE.get("stealth")
+            if fallback:
+                return fallback
             return post_id, None, None
         except Exception:
             return post_id, None, None