diff --git a/app.py b/app.py
index d27ff2a..90ab9c4 100644
--- a/app.py
+++ b/app.py
@@ -21,27 +21,15 @@ from attendance import get_members_with_fees, get_junior_members_with_fees, SHEE
 from match_payments import reconcile, fetch_sheet_data, fetch_exceptions, normalize, DEFAULT_SPREADSHEET_ID as PAYMENTS_SHEET_ID
 from cache_utils import get_sheet_modified_time, read_cache, write_cache, _LAST_CHECKED
 
-def get_cached_data(cache_key, sheet_id, fetch_func, *args, **kwargs):
+def get_cached_data(cache_key, sheet_id, fetch_func, *args, serialize=None, deserialize=None, **kwargs):
     mod_time = get_sheet_modified_time(cache_key)
     if mod_time:
         cached = read_cache(cache_key, mod_time)
         if cached is not None:
-            return cached
+            return deserialize(cached) if deserialize else cached
     data = fetch_func(*args, **kwargs)
     if mod_time:
-        write_cache(cache_key, mod_time, data)
-    return data
-
-def get_cached_exceptions(sheet_id, creds_path):
-    cache_key = "exceptions_dict"
-    mod_time = get_sheet_modified_time(cache_key)
-    if mod_time:
-        cached = read_cache(cache_key, mod_time)
-        if cached is not None:
-            return {tuple(k): v for k, v in cached}
-    data = fetch_exceptions(sheet_id, creds_path)
-    if mod_time:
-        write_cache(cache_key, mod_time, [[list(k), v] for k, v in data.items()])
+        write_cache(cache_key, mod_time, serialize(data) if serialize else data)
     return data
 
 def get_month_labels(sorted_months, merged_months):
@@ -123,7 +111,12 @@ def fees():
     
     # Get exceptions for formatting
     credentials_path = ".secret/fuj-management-bot-credentials.json"
-    exceptions = get_cached_exceptions(PAYMENTS_SHEET_ID, credentials_path)
+    exceptions = get_cached_data(
+            "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
+            PAYMENTS_SHEET_ID, credentials_path,
+            serialize=lambda d: [[list(k), v] for k, v in d.items()],
+            deserialize=lambda c: {tuple(k): v for k, v in c},
+        )
     record_step("fetch_exceptions")
     
     formatted_results = []
@@ -181,7 +174,12 @@ def fees_juniors():
     
     # Get exceptions for formatting (reusing payments sheet)
     credentials_path = ".secret/fuj-management-bot-credentials.json"
-    exceptions = get_cached_exceptions(PAYMENTS_SHEET_ID, credentials_path)
+    exceptions = get_cached_data(
+            "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
+            PAYMENTS_SHEET_ID, credentials_path,
+            serialize=lambda d: [[list(k), v] for k, v in d.items()],
+            deserialize=lambda c: {tuple(k): v for k, v in c},
+        )
     record_step("fetch_exceptions")
     
     formatted_results = []
@@ -253,7 +251,12 @@ def reconcile_view():
         
     transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, credentials_path)
     record_step("fetch_payments")
-    exceptions = get_cached_exceptions(PAYMENTS_SHEET_ID, credentials_path)
+    exceptions = get_cached_data(
+            "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
+            PAYMENTS_SHEET_ID, credentials_path,
+            serialize=lambda d: [[list(k), v] for k, v in d.items()],
+            deserialize=lambda c: {tuple(k): v for k, v in c},
+        )
     record_step("fetch_exceptions")
     result = reconcile(members, sorted_months, transactions, exceptions)
     record_step("reconcile")
@@ -346,7 +349,12 @@ def reconcile_juniors_view():
         
     transactions = get_cached_data("payments_transactions", PAYMENTS_SHEET_ID, fetch_sheet_data, PAYMENTS_SHEET_ID, credentials_path)
     record_step("fetch_payments")
-    exceptions = get_cached_exceptions(PAYMENTS_SHEET_ID, credentials_path)
+    exceptions = get_cached_data(
+            "exceptions_dict", PAYMENTS_SHEET_ID, fetch_exceptions,
+            PAYMENTS_SHEET_ID, credentials_path,
+            serialize=lambda d: [[list(k), v] for k, v in d.items()],
+            deserialize=lambda c: {tuple(k): v for k, v in c},
+        )
     record_step("fetch_exceptions")
 
     # Adapt junior tuple format (name, tier, {month: (fee, total_count, adult_count, junior_count)})