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backend/app/scan_state.py

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+from datetime import datetime
+from typing import Optional
+
+
+class ScanState:
+    def __init__(self):
+        self.status: str = "idle"  # idle, scanning, done, error
+        self.last_scan: Optional[datetime] = None
+        self.progress: int = 0
+        self.total: int = 0
+        self.error: str = ""
+
+    def start(self):
+        self.status = "scanning"
+        self.progress = 0
+        self.total = 0
+        self.error = ""
+
+    def finish(self, count: int):
+        self.status = "done"
+        self.progress = count
+        self.total = count
+        self.last_scan = datetime.utcnow()
+
+    def fail(self, error: str):
+        self.status = "error"
+        self.error = error
+
+    def to_dict(self) -> dict:
+        return {
+            "scan_status": self.status,
+            "last_scan": self.last_scan.isoformat() if self.last_scan else None,
+            "progress": self.progress,
+            "total": self.total,
+            "error": self.error,
+        }
+
+
+scan_state = ScanState()