diff --git a/hwe/compare/fixtures/monthly_pre_update.json b/hwe/compare/fixtures/monthly_pre_update.json
new file mode 100644
index 00000000..26d97f8f
--- /dev/null
+++ b/hwe/compare/fixtures/monthly_pre_update.json
@@ -0,0 +1,49 @@
+{
+  "action": "PreUpdateMonthly",
+  "environment": {
+    "year": 200,
+    "month": 12,
+    "startyear": 190
+  },
+  "setup": {
+    "syncEnvironment": true,
+    "resetGenerals": true,
+    "deleteOtherGenerals": true,
+    "keepGeneralIds": [1, 2],
+    "general": [
+      {"id": 1, "values": {"makelimit": 2}},
+      {"id": 2, "values": {"makelimit": 0}}
+    ],
+    "generalAccessLog": [
+      {"generalId": 1, "refreshScoreTotal": 101},
+      {"generalId": 2, "refreshScoreTotal": 1}
+    ],
+    "nation": [
+      {
+        "id": 1,
+        "values": {
+          "rate": 35,
+          "rate_tmp": 10,
+          "strategic_cmd_limit": 2,
+          "surlimit": 1,
+          "spy": "{\"1\":1,\"2\":2}"
+        }
+      }
+    ],
+    "city": [
+      {"id": 1, "values": {"state": 31, "term": 1, "conflict": {"1": 10}}},
+      {"id": 2, "values": {"state": 32, "term": 2, "conflict": {"1": 20}}},
+      {"id": 3, "values": {"state": 33, "term": 0, "conflict": {"1": 30}}},
+      {"id": 4, "values": {"state": 34, "term": 3, "conflict": {"1": 40}}},
+      {"id": 5, "values": {"state": 41, "term": 1, "conflict": {"1": 50}}},
+      {"id": 6, "values": {"state": 42, "term": 2, "conflict": {"1": 60}}},
+      {"id": 7, "values": {"state": 43, "term": 3, "conflict": {"1": 70}}}
+    ]
+  },
+  "observe": {
+    "generalIds": [1, 2],
+    "nationIds": [1],
+    "cityIds": [1, 2, 3, 4, 5, 6, 7],
+    "accessGeneralIds": [1, 2]
+  }
+}
diff --git a/hwe/compare/monthly_event_trace.php b/hwe/compare/monthly_event_trace.php
index 46346b5f..f76b55e0 100644
--- a/hwe/compare/monthly_event_trace.php
+++ b/hwe/compare/monthly_event_trace.php
@@ -34,6 +34,7 @@ function comparisonMonthlyPatch(string $table, int $id, array $values): void
             'allowed' => [
                 'name', 'color', 'capital', 'gennum', 'gold', 'rice', 'tech',
                 'power', 'level', 'type', 'rate_tmp', 'scout', 'aux',
+                'rate', 'strategic_cmd_limit', 'surlimit', 'spy',
             ],
         ],
         'general' => [
@@ -45,7 +46,7 @@ function comparisonMonthlyPatch(string $table, int $id, array $values): void
                 'leadership', 'strength', 'intel', 'experience', 'dedication',
                 'dex1', 'dex2', 'dex3', 'dex4', 'dex5', 'personal', 'special',
                 'specage', 'special2', 'specage2', 'betray', 'age',
-                'bornyear', 'deadyear', 'turntime',
+                'bornyear', 'deadyear', 'turntime', 'makelimit',
             ],
         ],
     ];
@@ -108,6 +109,7 @@ function comparisonMonthlyDetails(array $observe, int $worldHistoryAfterId): arr
                 'specialWar' => 'special2',
                 'specAge2' => 'specage2',
                 'betray' => 'betray',
+                'makeLimit' => 'makelimit',
                 'horse' => 'horse',
                 'weapon' => 'weapon',
                 'book' => 'book',
@@ -129,6 +131,7 @@ function comparisonMonthlyDetails(array $observe, int $worldHistoryAfterId): arr
             [
                 'id' => 'city',
                 'nationId' => 'nation',
+                'state' => 'state',
                 'supplyState' => 'supply',
                 'frontState' => 'front',
                 'officerSet' => 'officer_set',
@@ -162,9 +165,14 @@ function comparisonMonthlyDetails(array $observe, int $worldHistoryAfterId): arr
                 'gold' => 'gold',
                 'rice' => 'rice',
                 'rate' => 'rate_tmp',
+                'baseRate' => 'rate',
                 'typeCode' => 'type',
                 'scout' => 'scout',
+                'strategicCommandLimit' => 'strategic_cmd_limit',
+                'surrenderLimit' => 'surlimit',
+                'spy' => 'spy',
             ],
+            ['spy'],
         ),
         comparisonRowsById('nation', 'nation', comparisonIntegerList($observe['nationIds'] ?? [], 'nationIds')),
     );
@@ -213,6 +221,14 @@ function comparisonMonthlyDetails(array $observe, int $worldHistoryAfterId): arr
             $rankGeneralIds,
             $rankTypes,
         ));
+    $generalAccessLogs = [];
+    $accessGeneralIds = comparisonIntegerList($observe['accessGeneralIds'] ?? [], 'accessGeneralIds');
+    if ($accessGeneralIds) {
+        $generalAccessLogs = iterator_to_array($db->query(
+            'SELECT general_id AS generalId, refresh_score_total AS refreshScoreTotal FROM general_access_log WHERE general_id IN %li ORDER BY general_id',
+            $accessGeneralIds,
+        ));
+    }
     return [
         'generals' => $generals,
         'cities' => $cities,
@@ -220,6 +236,7 @@ function comparisonMonthlyDetails(array $observe, int $worldHistoryAfterId): arr
         'worldHistory' => $worldHistory,
         'inheritancePoints' => $inheritancePoints,
         'rankData' => $rankData,
+        'generalAccessLogs' => $generalAccessLogs,
     ];
 }
 
@@ -255,6 +272,7 @@ function comparisonMonthlyEventTraceMain(): void
             'AddGlobalBetray',
             'LostUniqueItem',
             'MergeInheritPointRank',
+            'PreUpdateMonthly',
         ];
         if (!in_array($actionName, $supportedActions, true)) {
             throw new \InvalidArgumentException('unsupported monthly action');
@@ -407,6 +425,21 @@ function comparisonMonthlyEventTraceMain(): void
                 'value' => $row['value'],
             ]);
         }
+        foreach ($setup['generalAccessLog'] ?? [] as $row) {
+            if (
+                !is_array($row)
+                || !is_int($row['generalId'] ?? null)
+                || !is_int($row['refreshScoreTotal'] ?? null)
+            ) {
+                throw new \InvalidArgumentException('invalid setup.generalAccessLog row');
+            }
+            DB::db()->insertUpdate('general_access_log', [
+                'general_id' => $row['generalId'],
+                'refresh_score_total' => $row['refreshScoreTotal'],
+            ], [
+                'refresh_score_total' => $row['refreshScoreTotal'],
+            ]);
+        }
         if (($setup['resetDiplomacy'] ?? false) === true) {
             DB::db()->query('DELETE FROM diplomacy');
         }
@@ -497,7 +530,9 @@ function comparisonMonthlyEventTraceMain(): void
         }
 
         $actionClass = "\\sammo\\Event\\Action\\{$actionName}";
-        if ($actionName === 'ProcessSemiAnnual') {
+        if ($actionName === 'PreUpdateMonthly') {
+            $action = null;
+        } elseif ($actionName === 'ProcessSemiAnnual') {
             $resource = $request['resource'] ?? null;
             if (!is_string($resource)) {
                 throw new \InvalidArgumentException('ProcessSemiAnnual requires resource');
@@ -581,7 +616,13 @@ function comparisonMonthlyEventTraceMain(): void
                 'fiction' => $fiction,
             ];
         }
-        $action->run($actionEnvironment);
+        if ($actionName === 'PreUpdateMonthly') {
+            if (!preUpdateMonthly()) {
+                throw new \RuntimeException('preUpdateMonthly failed');
+            }
+        } else {
+            $action->run($actionEnvironment);
+        }
         unset($action);
         gc_collect_cycles();
 
@@ -713,6 +754,11 @@ function comparisonMonthlyEventTraceMain(): void
                 'lastNPCTroopLeaderID',
             ]);
         }
+        if ($actionName === 'PreUpdateMonthly') {
+            $response['gameEnvironment'] = KVStorage::getStorage(DB::db(), 'game_env')->getValues([
+                'develcost',
+            ]);
+        }
         if (in_array($actionName, ['OpenNationBetting', 'FinishNationBetting'], true)) {
             $bettingStorage = KVStorage::getStorage(DB::db(), 'betting');
             $response['betting'] = $bettingStorage->getAll();