diff --git a/lib/www/server/lib/qc/shots/save-qc.js b/lib/www/server/lib/qc/shots/save-qc.js
index ba69d54..0c9748a 100644
--- a/lib/www/server/lib/qc/shots/save-qc.js
+++ b/lib/www/server/lib/qc/shots/save-qc.js
@@ -5,20 +5,16 @@ async function saveShotsQC (projectId, results) {
 	const client = await setSurvey(projectId);
 	await transaction.begin(client);
 
-	async function deleteQCEvent (sequence, shot, qc_id) {
-		// NOTE that we delete from event_log_full
-		// because the event is readonly and we can't otherwise
-		// modify it via event_log (though it'd be nice to)
+	async function deleteQCEvents (sequence) {
 		const text = `
 			DELETE
 			FROM event_log_full
-			WHERE
-				sequence = $1 AND point = $2
-				AND meta->>'qc_id' = $3;
+			WHERE sequence = $1 AND meta ? 'qc_id';
 		`;
 
-// 		console.log("DELETE QUERY", projectId, sequence, shot, qc_id);
-		return await client.query(text, [ sequence, shot, qc_id ]);
+		const values = [ sequence ];
+
+		return await client.query(text, values);
 	}
 
 	async function updateQCEvent (sequence, shot, qc_id, result) {
@@ -37,11 +33,11 @@ async function saveShotsQC (projectId, results) {
 	};
 
 	for (const sequence in results) {
+		// Remove *all* QC events for this sequence
+		await deleteQCEvents(sequence);
 		for (const shot in results[sequence]) {
 			for (const qc_id in results[sequence][shot]) {
 				const result = results[sequence][shot][qc_id];
-				// Remove any existing event for this QC
-				await deleteQCEvent(sequence, shot, qc_id);
 				if (result !== true) { // `true` means QC passed. Otherwise expect string or array.
 					// Add or replace an existing event for this QC
 					await updateQCEvent(sequence, shot, qc_id, result);