Mark items unavailable and retire DB optimization

This prepares us for the moving metadata to DB in the future

public/js/missing-items.js

@@ -0,0 +1,46 @@
+const component = () => {
+	return {
+		empty: true,
+		titles: [],
+		entries: [],
+		loading: true,
+
+		load() {
+			this.loading = true;
+			this.request('GET', `${base_url}api/admin/titles/missing`, data => {
+				this.titles = data.titles;
+				this.request('GET', `${base_url}api/admin/entries/missing`, data => {
+					this.entries = data.entries;
+					this.loading = false;
+					this.empty = this.entries.length === 0 && this.titles.length === 0;
+				});
+			});
+		},
+		rm(event) {
+			const rawID = event.currentTarget.closest('tr').id;
+			const [type, id] = rawID.split('-');
+			const url = `${base_url}api/admin/${type === 'title' ? 'titles' : 'entries'}/missing/${id}`;
+			this.request('DELETE', url, () => {
+				this.load();
+			});
+		},
+		request(method, url, cb) {
+			console.log(url);
+			$.ajax({
+					type: method,
+					url: url,
+					contentType: 'application/json'
+				})
+				.done(data => {
+					if (data.error) {
+						alert('danger', `Failed to ${method} ${url}. Error: ${data.error}`);
+						return;
+					}
+					if (cb) cb(data);
+				})
+				.fail((jqXHR, status) => {
+					alert('danger', `Failed to ${method} ${url}. Error: [${jqXHR.status}] ${jqXHR.statusText}`);
+				});
+		}
+	};
+};