fix: MariaDB datetime format error when pausing maintenance (#6513)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: louislam <1336778+louislam@users.noreply.github.com>
Co-authored-by: CommanderStorm <26258709+CommanderStorm@users.noreply.github.com>

server/model/maintenance.js

@@ -1,5 +1,5 @@
 const { BeanModel } = require("redbean-node/dist/bean-model");
-const { parseTimeObject, parseTimeFromTimeObject, log } = require("../../src/util");
+const { parseTimeObject, parseTimeFromTimeObject, log, SQL_DATETIME_FORMAT } = require("../../src/util");
 const { R } = require("redbean-node");
 const dayjs = require("dayjs");
 const Cron = require("croner");
@@ -262,7 +262,7 @@ class Maintenance extends BeanModel {
                     }, duration);
 
                     // Set last start date to current time
-                    this.last_start_date = current.toISOString();
+                    this.last_start_date = current.utc().format(SQL_DATETIME_FORMAT);
                     await R.store(this);
                 };
 

test/backend-test/test-maintenance.js

@@ -0,0 +1,65 @@
+const test = require("node:test");
+const assert = require("node:assert");
+const dayjs = require("dayjs");
+const { SQL_DATETIME_FORMAT } = require("../../src/util");
+
+dayjs.extend(require("dayjs/plugin/utc"));
+dayjs.extend(require("dayjs/plugin/customParseFormat"));
+
+/**
+ * Tests for maintenance date formatting to ensure compatibility with MariaDB/MySQL.
+ * Issue: MariaDB rejects ISO format dates like '2025-12-19T01:04:02.129Z'
+ * Fix: Use SQL_DATETIME_FORMAT ('YYYY-MM-DD HH:mm:ss') instead of toISOString()
+ */
+test("Maintenance Date Format - MariaDB Compatibility", async (t) => {
+
+    await t.test("SQL_DATETIME_FORMAT constant should match MariaDB format", async () => {
+        assert.strictEqual(SQL_DATETIME_FORMAT, "YYYY-MM-DD HH:mm:ss");
+    });
+
+    await t.test("Format date using SQL_DATETIME_FORMAT", async () => {
+        const current = dayjs.utc("2025-12-19T01:04:02.129Z");
+        const sqlFormat = current.utc().format(SQL_DATETIME_FORMAT);
+
+        assert.strictEqual(sqlFormat, "2025-12-19 01:04:02");
+    });
+
+    await t.test("SQL format should not contain ISO markers (T, Z)", async () => {
+        const current = dayjs.utc("2025-12-19T01:04:02.129Z");
+        const sqlFormat = current.utc().format(SQL_DATETIME_FORMAT);
+
+        assert.strictEqual(sqlFormat.includes("T"), false, "SQL format should not contain 'T'");
+        assert.strictEqual(sqlFormat.includes("Z"), false, "SQL format should not contain 'Z'");
+    });
+
+    await t.test("SQL format should match YYYY-MM-DD HH:mm:ss pattern", async () => {
+        const current = dayjs.utc("2025-12-19T01:04:02.129Z");
+        const sqlFormat = current.utc().format(SQL_DATETIME_FORMAT);
+        const sqlDateTimeRegex = /^\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}$/;
+
+        assert.strictEqual(sqlDateTimeRegex.test(sqlFormat), true);
+    });
+
+    await t.test("Parse SQL datetime back to dayjs preserves timestamp", async () => {
+        const originalDate = dayjs.utc("2025-12-19T01:04:02.000Z");
+        const sqlFormat = originalDate.utc().format(SQL_DATETIME_FORMAT);
+        const parsedDate = dayjs.utc(sqlFormat, SQL_DATETIME_FORMAT);
+
+        assert.strictEqual(parsedDate.unix(), originalDate.unix());
+    });
+
+    await t.test("Edge case: midnight timestamp", async () => {
+        const midnight = dayjs.utc("2025-01-01T00:00:00.000Z");
+        const sqlFormat = midnight.utc().format(SQL_DATETIME_FORMAT);
+
+        assert.strictEqual(sqlFormat, "2025-01-01 00:00:00");
+    });
+
+    await t.test("Edge case: end of day timestamp", async () => {
+        const endOfDay = dayjs.utc("2025-12-31T23:59:59.999Z");
+        const sqlFormat = endOfDay.utc().format(SQL_DATETIME_FORMAT);
+
+        assert.strictEqual(sqlFormat, "2025-12-31 23:59:59");
+    });
+
+});