feat: content_hash + дедупликация при загрузке

deploy/services/upload.py

@@ -77,6 +77,15 @@ def store_document(filename: str, file_data: bytes, contract_id: str = "",
     if not filename or not file_data:
         return {"ok": False, "error": "no file"}
 
+    import hashlib
+    content_hash = hashlib.sha256(file_data).hexdigest()
+
+    # Dedup: same content in same batch → skip
+    if batch_id:
+        existing = documents.get_by_hash(batch_id, content_hash)
+        if existing:
+            return {"ok": True, "duplicate_of": existing["id"], "filename": filename}
+
     mime = _mime_for(filename)
     b64 = base64.b64encode(file_data).decode()
 
@@ -86,7 +95,8 @@ def store_document(filename: str, file_data: bytes, contract_id: str = "",
         except Exception:
             pass
 
-    doc = documents.insert(filename, mime, b64, batch_id=batch_id, zip_source=zip_source)
+    doc = documents.insert(filename, mime, b64, batch_id=batch_id, zip_source=zip_source,
+                           content_hash=content_hash)
 
     if not contract_id:
         from datetime import datetime