diff --git a/SatelliteProvider.IntegrationTests/UavUploadTests.cs b/SatelliteProvider.IntegrationTests/UavUploadTests.cs
index 489a47f..0d2a8ae 100644
--- a/SatelliteProvider.IntegrationTests/UavUploadTests.cs
+++ b/SatelliteProvider.IntegrationTests/UavUploadTests.cs
@@ -350,7 +350,12 @@ public static class UavUploadTests
         return stream.ToArray();
     }
 
-    private static int _coordinateCounter;
+    // Seed the counter from a wall-clock value so each test-runner process picks a
+    // distinct coordinate band. Postgres state persists across docker-compose runs
+    // (named volume); a monotonic counter from 0 would collide with prior runs on
+    // the per-source unique index, especially for tests that seed rows via raw
+    // INSERT rather than the API's UPSERT path.
+    private static int _coordinateCounter = (int)((DateTime.UtcNow.Ticks / TimeSpan.TicksPerSecond) % 1_000_000);
 
     private static (double Latitude, double Longitude) NextTestCoordinate()
     {