diff --git a/Medidata/edc_import.log b/Medidata/edc_import.log
index 9fc2fa1..f4fe7f3 100644
--- a/Medidata/edc_import.log
+++ b/Medidata/edc_import.log
@@ -21,3 +21,9 @@
 2026-05-20 18:14:22,340 INFO   nové: 2087  aktualizované: 4  chyby: 0
 2026-05-20 18:14:22,340 INFO ============================================================
 2026-05-20 18:14:22,340 INFO Celkem — nové: 2091  aktualizované: 4  chyby: 0
+2026-05-20 21:56:49,619 INFO Importuji: downloads/2026-05-20_15-21_EDC_MDD3003_QueryDetails.csv → edc.queries + queries_snapshots [2026-05-20]
+2026-05-20 21:56:49,670 INFO   nové: 0  aktualizované: 4  chyby: 0
+2026-05-20 21:56:49,711 INFO Importuji: downloads/2026-05-20_15-23_EDC_MDD3003_QueryDetails.csv → edc.queries + queries_snapshots [2026-05-20]
+2026-05-20 21:57:07,554 INFO   nové: 0  aktualizované: 2091  chyby: 0
+2026-05-20 21:57:07,554 INFO ============================================================
+2026-05-20 21:57:07,554 INFO Celkem — nové: 0  aktualizované: 2095  chyby: 0
diff --git a/Medidata/edc_import.py b/Medidata/edc_import.py
index 9dda174..b53674a 100644
--- a/Medidata/edc_import.py
+++ b/Medidata/edc_import.py
@@ -170,6 +170,31 @@ def ensure_query_indexes(collection) -> None:
     collection.create_index([("openedDate", ASCENDING)])
 
 
+def ensure_snapshot_indexes(collection) -> None:
+    """Indexy pro queries_snapshots — unikátní kombinace queryId + snapshotDate."""
+    collection.create_index(
+        [("queryId", ASCENDING), ("snapshotDate", ASCENDING)],
+        unique=True,
+    )
+    collection.create_index([("snapshotDate", ASCENDING)])
+    collection.create_index([("queryStatus", ASCENDING)])
+    collection.create_index([("site.number", ASCENDING)])
+    collection.create_index([("subject.label", ASCENDING)])
+
+
+def extract_snapshot_date(filename: str) -> str:
+    """
+    Vytáhne datum ze jména souboru.
+    '2026-05-20_15-23_EDC_MDD3003_QueryDetails.csv' → '2026-05-20'
+    Fallback: dnešní datum.
+    """
+    stem = Path(filename).name
+    match = re.match(r"(\d{4}-\d{2}-\d{2})", stem)
+    if match:
+        return match.group(1)
+    return datetime.now(timezone.utc).strftime("%Y-%m-%d")
+
+
 def parse_date(value: str) -> str | None:
     """Pokusí se převést string na ISO 8601; jinak vrátí None."""
     value = value.strip()
@@ -294,8 +319,16 @@ def ensure_indexes(collection) -> None:
     collection.create_index([("lastModified", ASCENDING)])
 
 
-def import_file(csv_path: str, collection) -> tuple[int, int, int]:
-    """Importuje jeden CSV soubor. Vrátí (inserted, updated, errors)."""
+def import_file(
+    csv_path: str,
+    collection,
+    snapshot_col=None,
+    snapshot_date: str | None = None,
+) -> tuple[int, int, int]:
+    """
+    Importuje jeden CSV soubor. Vrátí (inserted, updated, errors).
+    snapshot_col: pokud je zadán, pro QueryDetails se zapíše i daily snapshot.
+    """
     inserted = updated = errors = 0
     source_file = Path(csv_path).name
 
@@ -308,6 +341,15 @@ def import_file(csv_path: str, collection) -> tuple[int, int, int]:
                 if query_mode:
                     doc = map_query_row(row, source_file)
                     upsert_key = {"queryId": doc["queryId"]}
+
+                    # Snapshot — upsert na (queryId, snapshotDate)
+                    if snapshot_col is not None and snapshot_date:
+                        snap_doc = {**doc, "snapshotDate": snapshot_date}
+                        snapshot_col.update_one(
+                            {"queryId": doc["queryId"], "snapshotDate": snapshot_date},
+                            {"$set": snap_doc},
+                            upsert=True,
+                        )
                 else:
                     doc = map_row(row, source_file)
                     record_id = doc.get("form", {}).get("recordId")
@@ -377,13 +419,22 @@ def main() -> None:
             col_name = "queries"
             collection = db[col_name]
             ensure_query_indexes(collection)
+            snapshot_col = db["queries_snapshots"]
+            ensure_snapshot_indexes(snapshot_col)
+            snapshot_date = extract_snapshot_date(csv_path)
+            log.info("Importuji: %s → %s.%s + queries_snapshots [%s]",
+                     csv_path, args.db, col_name, snapshot_date)
         else:
             col_name = collection_name_from_filename(csv_path)
             collection = db[col_name]
             ensure_indexes(collection)
+            snapshot_col = None
+            snapshot_date = None
+            log.info("Importuji: %s → %s.%s", csv_path, args.db, col_name)
 
-        log.info("Importuji: %s → %s.%s", csv_path, args.db, col_name)
-        inserted, updated, errors = import_file(csv_path, collection)
+        inserted, updated, errors = import_file(
+            csv_path, collection, snapshot_col, snapshot_date
+        )
         total_inserted += inserted
         total_updated += updated
         total_errors += errors