Reconcile delayed frame sync before scheduled writes

pigway_frame_flow/display/service.py

@@ -50,6 +50,7 @@ class DisplayService:
         self.retention = Retention(self)
         self.cloud_library = CloudLibrary(self)
         self.expiration_checked: dict[str, float] = {}
+        self.unknown_checked: dict[str, float] = {}
         # A killed write cannot be replayed safely; pre-write work can resume.
         db.execute(
             "UPDATE operations SET status='UNKNOWN', updated_at=? WHERE write_started=1 AND status IN ('UPLOADING','RENDERING')",
@@ -689,6 +690,31 @@ class DisplayService:
         )
 
     def sync(self):
+        # Late acknowledgements only resolve a known display target. Never replay
+        # writes or infer success from gallery presence alone.
+        for op in self.db.all(
+            "SELECT * FROM operations WHERE status='UNKNOWN' AND action='display' AND write_started=1"
+        ):
+            expected = json.loads(op["result"] or "{}").get("image_id")
+            if not expected:
+                continue
+            checked = time.monotonic()
+            if checked - self.unknown_checked.get(op["id"], float("-inf")) < 60:
+                continue
+            self.unknown_checked[op["id"]] = checked
+            try:
+                device = self.registry.get(op["device_id"]).device(refresh=True)
+                if (
+                    device.current_content.id == expected
+                    and device.current_content.synced
+                ):
+                    self.update(op["id"], "COMPLETED")
+                    self.cloud_library.confirm(op["id"])
+                    self.db.history(op, "COMPLETED")
+                    self.db.event("operation.completed", {"operation_id": op["id"]})
+                    self.unknown_checked.pop(op["id"], None)
+            except FlowError:
+                pass
         for op in self.db.all("SELECT * FROM operations WHERE status='SYNCING'"):
             try:
                 device = self.registry.get(op["device_id"]).device()
@@ -824,6 +850,9 @@ class DisplayService:
                     {"image_id": device.current_content.id},
                 )
                 resolved = True
+                if confirmed and op["action"] == "display":
+                    self.cloud_library.confirm(id)
+                    self.db.event("operation.completed", {"operation_id": id})
                 self.db.history(
                     dict(
                         id=id,