Fixed dropbox file removing issue, UI navigation sticky mode

backend/media_registry.py

@@ -0,0 +1,54 @@
+"""Confirmed, safely retryable writes for immutable upload-ID metadata."""
+import logging
+import re
+import time
+
+from httpx import TransportError
+from supabase import PostgrestAPIError
+
+logger = logging.getLogger("uvicorn.error")
+TRANSIENT_CODES = {"500", "502", "503", "504", "520", "522", "524"}
+
+
+class UnconfirmedMediaWrite(RuntimeError):
+    pass
+
+
+def matches(rows, records):
+    saved = {row["upload_id"]: row["metadata"] for row in (rows or [])}
+    return all(saved.get(record["upload_id"]) == record["metadata"] for record in records)
+
+
+def upsert(client, table, records):
+    """Retry only identical upserts by primary key, never article inserts/deletes.
+
+    A timeout can arrive after commit. Read back the exact batch to confirm it,
+    including servers/proxies that return no representation of a successful write.
+    """
+    for attempt in range(3):
+        try:
+            result = client.table(table).upsert(records, on_conflict="upload_id").retry(False).execute()
+            if matches(result.data, records):
+                return
+            raise UnconfirmedMediaWrite("Media write returned incomplete confirmation")
+        except Exception as exc:
+            code = str(getattr(exc, "code", ""))
+            transient = isinstance(exc, (TransportError, UnconfirmedMediaWrite)) or (
+                isinstance(exc, PostgrestAPIError) and code in TRANSIENT_CODES
+            )
+            safe_code = code if re.fullmatch(r"[A-Za-z0-9_]{1,20}", code) else "unknown"
+            logger.warning("Media registry write: table=%s type=%s code=%s attempt=%s", table, type(exc).__name__, safe_code, attempt + 1)
+            if not transient:
+                raise
+            try:
+                confirmed = client.table(table).select("upload_id,metadata").in_(
+                    "upload_id", [record["upload_id"] for record in records],
+                ).retry(False).execute()
+                if matches(confirmed.data, records):
+                    return
+            except Exception:
+                # Preserve the original write failure if neither operation works.
+                pass
+            if attempt == 2:
+                raise
+            time.sleep(0.25 * (attempt + 1))