diff --git a/koseki/plugins/metric/metric.py b/koseki/plugins/metric/metric.py
index 5fa7491..9ca86c6 100644
--- a/koseki/plugins/metric/metric.py
+++ b/koseki/plugins/metric/metric.py
@@ -83,9 +83,13 @@ def __calc_metric_payment(self) -> None:
                 payments[0].registered.date(), datetime.min.time())
         else:
             time = metrics[0].time
+
+        metrics_idx : int = 0
         while time <= datetime.now():
             # Only insert the metric row if it doesn't already exist.
-            if sum(1 for metric in metrics if metric.time == time) == 0:
+            while metrics_idx < (len(metrics) - 1) and metrics[metrics_idx].time < time:
+                metrics_idx += 1
+            if len(metrics) == 0 or metrics[metrics_idx].time != time:
                 total: float = 0.0
                 for payment in payments:
                     if payment.registered < time:
diff --git a/requirements/common.txt b/requirements/common.txt
index 2fbe1d6..e62156f 100644
--- a/requirements/common.txt
+++ b/requirements/common.txt
@@ -3,7 +3,7 @@ argon2-cffi>=20.1.0
 email-validator>=1.1.2
 flask-multistatic>=1.0
 flask-wtf>=0.14.3
-flask>=1.1.2
+flask==1.1.2
 libsass>=0.20.1
 logging_prometheus>=0.1.0
 lxml>=4.6.2
@@ -12,4 +12,5 @@ prometheus-flask-exporter>=0.18.1
 pyop>=3.2.0
 pyjwkest>=1.4.2
 requests>=2.25.1
-SQLAlchemy>=1.4.15
\ No newline at end of file
+SQLAlchemy==1.4.15
+markupsafe==2.0.1