Support to list snapshot

api/database.py

@@ -162,6 +162,14 @@ def execute_redo(name: str) -> ChangeSet:
     return ChangeSet.from_list(e)
 
 
+def list_snapshot(name: str) -> list[tuple[int, str]]:
+    rows = read_all(name, f'select * from operation order by id')
+    result = []
+    for row in rows:
+        result.append((int(row['id']), str(row['tag'])))
+    return result
+
+
 def have_snapshot(name: str, tag: str) -> bool:
     return read(name, f"select id from snapshot_operation where tag = '{tag}'") != None