diff --git a/src/order_bak/cli.py b/src/order_bak/cli.py
index af3745c..707e5e9 100644
--- a/src/order_bak/cli.py
+++ b/src/order_bak/cli.py
@@ -57,5 +57,33 @@ def backup(ctx, start, end, scan_path):
     )
 
 
+@main.command()
+@click.option("--csv", "csv_path", required=True, type=click.Path(exists=True), help="Path to backup CSV to delete")
+@click.pass_context
+def delete(ctx, csv_path):
+    cfg = load_config(ctx.obj["config_path"])
+    from azure.data.tables import TableClient
+    from order_bak.delete import delete_orders
+
+    csv_file = Path(csv_path)
+
+    import csv as csv_mod
+    with open(csv_file, newline="") as f:
+        count = sum(1 for _ in csv_mod.DictReader(f))
+
+    click.echo(f"Will delete {count} orders from {csv_file}")
+    if not click.confirm("Continue?"):
+        click.echo("Aborted")
+        return
+
+    table = TableClient.from_connection_string(cfg.azure_connection_string, table_name="order")
+    delete_orders(
+        table_client=table,
+        csv_path=csv_file,
+        batch_size=cfg.delete_batch_size,
+        delay_ms=cfg.delete_delay_ms,
+    )
+
+
 if __name__ == "__main__":
     main()
diff --git a/src/order_bak/delete.py b/src/order_bak/delete.py
new file mode 100644
index 0000000..ac11ebd
--- /dev/null
+++ b/src/order_bak/delete.py
@@ -0,0 +1,39 @@
+import csv
+import time
+from collections import defaultdict
+from itertools import islice
+from pathlib import Path
+
+
+def _chunked(iterable, size):
+    it = iter(iterable)
+    while chunk := list(islice(it, size)):
+        yield chunk
+
+
+def delete_orders(
+    table_client,
+    csv_path: Path,
+    batch_size: int,
+    delay_ms: int,
+) -> int:
+    by_partition: dict[str, list[dict]] = defaultdict(list)
+
+    with open(csv_path, newline="") as f:
+        reader = csv.DictReader(f)
+        for row in reader:
+            pk = row["PartitionKey"]
+            rk = row["RowKey"]
+            by_partition[pk].append({"PartitionKey": pk, "RowKey": rk})
+
+    total_deleted = 0
+    for pk, entities in by_partition.items():
+        for batch in _chunked(entities, batch_size):
+            operations = [("delete", e) for e in batch]
+            table_client.submit_transaction(operations)
+            total_deleted += len(batch)
+            if delay_ms > 0:
+                time.sleep(delay_ms / 1000.0)
+
+    print(f"Deleted {total_deleted} orders across {len(by_partition)} partitions")
+    return total_deleted
diff --git a/tests/test_delete.py b/tests/test_delete.py
new file mode 100644
index 0000000..f5098ba
--- /dev/null
+++ b/tests/test_delete.py
@@ -0,0 +1,67 @@
+from datetime import datetime, timezone
+from unittest.mock import MagicMock
+
+from order_bak.csv_utils import write_csv
+from order_bak.delete import delete_orders
+
+
+def _make_entity(pk, rk):
+    return {
+        "PartitionKey": pk,
+        "RowKey": rk,
+        "OrderTime": datetime(2025, 1, 1, tzinfo=timezone.utc),
+        "ReceiveTime": None,
+        "revenue": 10.0,
+        "platformOrder": "p",
+        "prodCount": 1,
+        "pfId": pk,
+        "prodId": "prod",
+        "prodPrice": 10.0,
+        "state": 1,
+        "ver": 3,
+        "customData": None,
+    }
+
+
+def test_delete_groups_by_partition_and_batches(tmp_path):
+    entities = []
+    for i in range(3):
+        entities.append(_make_entity("user1", f"order{i}"))
+    for i in range(3, 5):
+        entities.append(_make_entity("user2", f"order{i}"))
+
+    csv_path = tmp_path / "2025-01-01.csv"
+    write_csv(csv_path, entities)
+
+    mock_table = MagicMock()
+
+    deleted_count = delete_orders(
+        table_client=mock_table,
+        csv_path=csv_path,
+        batch_size=2,
+        delay_ms=0,
+    )
+
+    assert deleted_count == 5
+    # user1: 3 entities, batch_size=2 -> 2 batches (2 + 1)
+    # user2: 2 entities, batch_size=2 -> 1 batch
+    assert mock_table.submit_transaction.call_count == 3
+
+
+def test_delete_respects_batch_size(tmp_path):
+    entities = [_make_entity("user1", f"order{i}") for i in range(5)]
+
+    csv_path = tmp_path / "2025-01-01.csv"
+    write_csv(csv_path, entities)
+
+    mock_table = MagicMock()
+
+    deleted_count = delete_orders(
+        table_client=mock_table,
+        csv_path=csv_path,
+        batch_size=2,
+        delay_ms=0,
+    )
+
+    assert deleted_count == 5
+    assert mock_table.submit_transaction.call_count == 3  # 2+2+1