diff --git a/src/ingest.py b/src/ingest.py
index 42a1d93..7780906 100644
--- a/src/ingest.py
+++ b/src/ingest.py
@@ -164,6 +164,16 @@ def record_groups(resources: list[ResourcePath]) -> None:
                     logger.exception("Error reading header for %s", res)
             try:
                 instrument = header["INSTRUME"]
+                # Canonicalize instrument name
+                match instrument.lower():
+                    case "lsstcomcamsim" | "comcamsim":
+                        instrument = "LSSTComCamSim"
+                    case "lsstcomcam" | "comcam":
+                        instrument = "LSSTComCam"
+                    case "lsstcam":
+                        instrument = "LSSTCam"
+                    case "latiss":
+                        instrument = "LATISS"
                 groupid = header["GROUPID"]
                 snap_number = int(header["CURINDEX"]) - 1
                 detector = header["RAFTBAY"] + "_" + header["CCDSLOT"]
diff --git a/src/presence.py b/src/presence.py
index 77607e0..1cc99fc 100644
--- a/src/presence.py
+++ b/src/presence.py
@@ -66,7 +66,7 @@ def presence(instrument: str, group_name: str, snap_index: int, detector_name: s
             return ({"error": True, "message": f"Unrecognized detector name {detector_name}"}, 400)
         key = f"GROUP:{instrument}:{group_name}:{snap_index}:{detector_name}"
         result = r.get(key)
-        if result:
+        if result is not None:
             logger.info(f"Found key {key}")
             if delete_seen:
                 r.delete(key)