diff --git a/bincio/extract/metrics.py b/bincio/extract/metrics.py
index 216db4e..d5bb97a 100644
--- a/bincio/extract/metrics.py
+++ b/bincio/extract/metrics.py
@@ -131,6 +131,10 @@ def compute_mmp(pts: list[DataPoint], started_at: datetime) -> Optional[list[lis
 
     t_min = min(sparse)
     t_max = max(sparse)
+    # Guard against corrupted time data (e.g. absolute Unix timestamps stored as
+    # elapsed offsets, which can make t_max astronomically large and OOM the process).
+    if t_max - t_min > 7 * 24 * 3600:  # > 1 week → corrupted stream
+        return None
     power_1hz: list[int] = [sparse.get(t, 0) for t in range(t_min, t_max + 1)]
 
     n = len(power_1hz)
@@ -190,6 +194,10 @@ def compute_best_efforts(
 
     t_min = min(sparse_speed)
     t_max = max(sparse_speed)
+    # Guard against corrupted time data (e.g. absolute Unix timestamps stored as
+    # elapsed offsets, which can make t_max astronomically large and OOM the process).
+    if t_max - t_min > 7 * 24 * 3600:  # > 1 week → corrupted stream
+        return None, None
     speed_1hz: list[float] = [sparse_speed.get(t, 0.0) for t in range(t_min, t_max + 1)]
     ele_1hz: list[Optional[float]] = [sparse_ele.get(t) for t in range(t_min, t_max + 1)]