diff --git a/pvnet_app/data.py b/pvnet_app/data.py
index fc8eee3..a85794e 100644
--- a/pvnet_app/data.py
+++ b/pvnet_app/data.py
@@ -55,7 +55,9 @@ def preprocess_sat_data(t0):
         logger.info(f"Latest 15-minute timestamp is {latest_time_15} for t0 time {t0}.")
         
         logger.debug("Resampling 15 minute data to 5 mins")
-        ds_sat_15.resample(time="5T").interpolate("linear").to_zarr(sat_path)
+        #ds_sat_15.resample(time="5T").interpolate("linear").to_zarr(sat_path)
+        ds_sat_15.attrs["source"] = "15-minute"
+        ds_sat_15.to_zarr(sat_path)
                 
         
 def download_nwp_data():
diff --git a/tests/conftest.py b/tests/conftest.py
index 4b23f3f..ed8b6a5 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -147,12 +147,11 @@ def sat_5_data():
 
 @pytest.fixture()
 def sat_5_data_delayed(sat_5_data):
-    sat_5_delayed = sat_5_data.copy(deep=True)
-    
     # Set the most recent timestamp to 2 - 2.5 hours ago
     t_most_recent = time_before_present(timedelta(hours=2)).floor(timedelta(minutes=30))
-    offset = sat_5_delayed.time.max().values - t_most_recent
-    sat_5_delayed.time.values[:] = sat_5_delayed.time.values - offset
+    offset = sat_5_data.time.max().values - t_most_recent
+    sat_5_delayed = sat_5_data.copy(deep=True)
+    sat_5_delayed["time"] = sat_5_data.time.values - offset
     return sat_5_delayed
 
 
diff --git a/tests/test_app.py b/tests/test_app.py
index 9e6fc96..8b3c3fd 100644
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -11,7 +11,7 @@
 )
 
 
-def _test_app(db_session, nwp_data, sat_5_data, sat_15_data, gsp_yields_and_systems, me_latest):
+def test_app(db_session, nwp_data, sat_5_data, gsp_yields_and_systems, me_latest):
     # Environment variable DB_URL is set in engine_url, which is called by db_session
     # set NWP_ZARR_PATH
     # save nwp_data to temporary file, and set NWP_ZARR_PATH
@@ -32,13 +32,6 @@ def _test_app(db_session, nwp_data, sat_5_data, sat_15_data, gsp_yields_and_syst
         store = zarr.storage.ZipStore(temp_sat_path, mode="x")
         sat_5_data.to_zarr(store)
         store.close()
-
-        # Maybe save the 15-minute data too
-        if sat_15_data is not None:
-            temp_sat_path = os.environ["SATELLITE_ZARR_PATH"].replace("sat.zarr", "sat_15.zarr")
-            store = zarr.storage.ZipStore(temp_sat_path, mode="x")
-            sat_15_data.to_zarr(store)
-            store.close()
         
         # Set model version
         os.environ["SAVE_GSP_SUM"] = "True"
@@ -65,29 +58,4 @@ def _test_app(db_session, nwp_data, sat_5_data, sat_15_data, gsp_yields_and_syst
     
     # Clean up
     db_session.query(ForecastSQL).delete()
-    db_session.commit()
-
-
-def test_app_5(db_session, nwp_data, sat_5_data, gsp_yields_and_systems, me_latest):
-    
-    _test_app(
-        db_session=db_session, 
-        nwp_data=nwp_data, 
-        sat_5_data=sat_5_data, 
-        sat_15_data=None,
-        gsp_yields_and_systems=gsp_yields_and_systems, 
-        me_latest=me_latest
-    )
-    
-
-def test_app_15(
-    db_session, nwp_data, sat_5_data_delayed, sat_15_data, gsp_yields_and_systems, me_latest
-):
-    _test_app(
-        db_session=db_session, 
-        nwp_data=nwp_data, 
-        sat_5_data=sat_5_data_delayed, 
-        sat_15_data=sat_15_data,
-        gsp_yields_and_systems=gsp_yields_and_systems, 
-        me_latest=me_latest
-    )
+    db_session.commit()
\ No newline at end of file