Add functions to accept/unaccept QCs.

These are only able to deal with shot QCs. At this point, sequence-wide
QCs cannot be marked as accepted.

lib/www/server/lib/db/qc/results/accept.js

@@ -0,0 +1,23 @@
+const { setSurvey } = require('../../connection');
+
+async function accept (projectId, payload) {
+	const client = await setSurvey(projectId);
+
+	const text = `
+		UPDATE event_log_full
+		SET
+			labels = array_append(labels, 'QCAccepted')
+		WHERE
+			validity @> current_timestamp
+			AND id = ANY($1)
+			AND NOT ('QCAccepted' = ANY(labels));
+	`;
+
+	const values = [ payload ];
+
+	await client.query(text, values);
+	client.release();
+	return;
+}
+
+module.exports = accept;

lib/www/server/lib/db/qc/results/index.js

@@ -1,5 +1,7 @@
 
 module.exports = {
 	get: require('./get'),
-	delete: require('./delete')
+	delete: require('./delete'),
+	accept: require('./accept'),
+	unaccept: require('./unaccept')
 };

lib/www/server/lib/db/qc/results/unaccept.js

@@ -0,0 +1,22 @@
+const { setSurvey, transaction } = require('../../connection');
+
+async function unaccept (projectId, payload) {
+	const client = await setSurvey(projectId);
+
+	const text = `
+		UPDATE event_log_full
+		SET
+			labels = array_remove(labels, 'QCAccepted')
+		WHERE
+			validity @> current_timestamp
+			AND id = ANY($1);
+	`;
+
+	const values = [ payload ];
+
+	await client.query(text, values);
+	client.release();
+	return;
+}
+
+module.exports = unaccept;