Improve randomisation of answers

amateurfunk_anki.py

@@ -37,6 +37,7 @@ import secrets
 import shutil
 import sqlite3
 import sys
+import time
 import unicodedata
 import zipfile
 from pathlib import Path
@@ -1790,6 +1791,19 @@ def resolve_shuffle_seed(seed):
     return secrets.token_hex(16)
 
 
+def build_epoch_for_rebuild(override_epoch=None):
+    """Return the modification epoch for a multiple-choice deck build.
+
+    A normal rebuild reshuffles the answer HTML, so its notes must carry
+    the current time for Anki to recognize the imported copies as newer.
+    `--epoch` remains the explicit escape hatch for byte-reproducible
+    builds, where the caller intentionally fixes every timestamp.
+    """
+    if override_epoch is not None:
+        return int(override_epoch)
+    return int(time.time())
+
+
 def build_all(data_dir, out_dir, seed, override_epoch=None, explanations_path=None):
     """Build every category's `.apkg` and return their result dicts.
 
@@ -1798,8 +1812,8 @@ def build_all(data_dir, out_dir, seed, override_epoch=None, explanations_path=No
     `.apkg` each. Raises `AnkiBuildError` on configuration / catalog
     / explanation-schema problems.
     """
-    edition_dir, manifest, catalog = load_latest_catalog(data_dir)
-    build_epoch = build_epoch_from_manifest(manifest, override_epoch)
+    edition_dir, _manifest, catalog = load_latest_catalog(data_dir)
+    build_epoch = build_epoch_for_rebuild(override_epoch)
     explanations = load_explanations(
         explanations_path if explanations_path is not None
         else DEFAULT_EXPLANATIONS_PATH
@@ -1866,8 +1880,8 @@ def _parse_args(argv):
         type=int,
         default=None,
         help=(
-            "override the package timestamp epoch; by default this is "
-            "derived from manifest.json's fetched_at"
+            "override the package and note modification timestamp epoch; "
+            "by default the current rebuild time is used"
         ),
     )
     parser.add_argument(