basic implementation of DB upgrades

static/js/migration.js

@@ -0,0 +1,43 @@
+$(document).ready(() => {
+    $.get(baseApiUrl + 'migration').then(result => {
+        const appDbVersion = result.app_db_version;
+        const dbVersion = result.db_version;
+
+        if (appDbVersion === dbVersion) {
+            $("#up-to-date").show();
+        }
+        else {
+            $("#need-to-migrate").show();
+
+            $("#app-db-version").html(appDbVersion);
+            $("#db-version").html(dbVersion);
+        }
+    });
+});
+
+$("#run-migration").click(() => {
+    $("#run-migration").prop("disabled", true);
+
+    $("#migration-result").show();
+
+    $.ajax({
+        url: baseApiUrl + 'migration',
+        type: 'POST',
+        success: result => {
+            for (const migration of result.migrations) {
+                const row = $('<tr>')
+                        .append($('<td>').html(migration.db_version))
+                        .append($('<td>').html(migration.name))
+                        .append($('<td>').html(migration.success ? 'Yes' : 'No'))
+                        .append($('<td>').html(migration.success ? 'N/A' : migration.error));
+
+                if (!migration.success) {
+                    row.addClass("danger");
+                }
+
+                $("#migration-table").append(row);
+            }
+        },
+        error: () => alert("Migration failed with unknown error")
+    });
+});