Clean legacy cache files on startup

backend/app.py

@@ -81,6 +81,7 @@ RECLASS_LOG_KEY = "TF#g9FA@UgKdN'usVtm3dTz*yoqbria`"
 IMAGE_CACHE_DIR = Path("/data")
 IMAGE_CACHE_PASSWORD = '68c6I5B!W[6/"0n>W%G/lUOEY`K|zvQ4'
 IMAGE_CACHE_KEY = hashlib.sha256(IMAGE_CACHE_PASSWORD.encode()).digest()
+IMAGE_URL_VERSION = 2
 THUMB_MAX_AGE = 1800
 THUMB_CLEAN_INTERVAL = 300
 THUMB_DIR = Path(tempfile.gettempdir()) / "pixif2-thumbs"
@@ -2002,6 +2003,13 @@ def image_cache_path(post_id, page):
     return IMAGE_CACHE_DIR / str(post_id) / f"{page}.epng"
 
 
+def cleanup_image_cache_root():
+    IMAGE_CACHE_DIR.mkdir(parents=True, exist_ok=True)
+    for path in IMAGE_CACHE_DIR.iterdir():
+        if path.is_file():
+            path.unlink()
+
+
 def write_image_cache(path, data):
     path.parent.mkdir(parents=True, exist_ok=True)
     fd, tmp = tempfile.mkstemp(dir=path.parent, suffix=".tmp")
@@ -2065,7 +2073,7 @@ async def create_webp(post_id, image_url, page=0, kind="t"):
 
 def image_links(post_id, url):
     page = page_num_from_url(url)
-    suffix = f"?p={page}"
+    suffix = f"?p={page}&v={IMAGE_URL_VERSION}"
     pid = quote(str(post_id), safe="")
     thumb_url = f"/api/i/{pid}/t{suffix}"
     preview_url = f"/api/i/{pid}/v{suffix}"
@@ -2327,6 +2335,7 @@ class ReclassRequest(BaseModel):
 
 @app.on_event("startup")
 async def startup():
+    await asyncio.to_thread(cleanup_image_cache_root)
     if not TURSO_DB_URL:
         print("WARN: TURSO_DB_URL not set, skipping DB init")
         return

frontend/app.js

@@ -9,6 +9,7 @@ const LONG_DIGITS_RE = /\d{6,}/g
 const POST_ID_RE = /\d+/g
 const PAGE_SIZE = 60
 const SEARCH_PAGE_SIZE = 10
+const IMAGE_URL_VERSION = 2
 let viewerScale = 1
 let viewerDrag = null
 let viewerPostId = ""
@@ -658,8 +659,8 @@ function openViewer(item) {
 function showViewerPage() {
   const page = viewerPages[viewerPageIndex]
   const pid = encodeURIComponent(viewerPostId)
-  $("#viewer-img").src = `/api/i/${pid}/v?p=${page}`
-  $("#viewer-download").href = `/api/i/${pid}/o?p=${page}`
+  $("#viewer-img").src = `/api/i/${pid}/v?p=${page}&v=${IMAGE_URL_VERSION}`
+  $("#viewer-download").href = `/api/i/${pid}/o?p=${page}&v=${IMAGE_URL_VERSION}`
   $("#viewer-prev").disabled = viewerPageIndex <= 0
   $("#viewer-next").disabled = viewerPageIndex >= viewerPages.length - 1
   $("#viewer-prev").classList.toggle("hidden", viewerPages.length <= 1)