Make it possible to list one specific sequence

lib/www/server/lib/db/sequence/list.js

@@ -14,8 +14,12 @@ async function list (projectId, opts = {}) {
 	const filter = opts.filter;
 	const noFilter = !("filter" in opts) || opts.filter === null || !String(opts.filter).trim().length;
 
+	const sequenceText = opts.sequence
+		? "sequence = $4"
+		: "$4 = $4";
+
 	const filterText = noFilter
-		? "TRUE"
+		? "$3 = $3"
 		: `
 			$3 = sequence::text
 			OR line::text ~ $3
@@ -62,14 +66,14 @@ async function list (projectId, opts = {}) {
 		`)
 		+ `
 			WHERE
+				${sequenceText} AND
 				${filterText}
 			ORDER BY ${sortKey} ${sortDir}
 			OFFSET $1
 			LIMIT $2;
 		`;
 
-	const values = [offset, limit];
-	if (!noFilter) values.push(filter);
+	const values = [offset, limit, filter||0, opts.sequence||0];
 	const res = await client.query(text, values);
 	client.release();
 	return res.rows;