fix: expand avatar column length from 1024 to 2048

The avatar column was too short to store long URLs from external OAuth
providers. When users log in via connector-google plugin, the Google
profile picture URL can exceed 1024 characters, causing a database error:

  Error 1406 (22001): Data too long for column 'avatar' at row 1

This change expands the avatar column from VARCHAR(1024) to VARCHAR(2048).

Note: While URLs can technically exceed 2048 characters per specification,
2048 is the practical limit supported by most browsers and services.
URLs longer than 2048 characters are extremely rare in real-world usage.

Author: csouls

internal/entity/user_entity.go

@@ -60,7 +60,7 @@ type User struct {
 	Status         int       `xorm:"not null default 1 INT(11) status"`
 	AuthorityGroup int       `xorm:"not null default 1 INT(11) authority_group"`
 	DisplayName    string    `xorm:"not null default '' VARCHAR(30) display_name"`
-	Avatar         string    `xorm:"not null default '' VARCHAR(1024) avatar"`
+	Avatar         string    `xorm:"not null default '' VARCHAR(2048) avatar"`
 	Mobile         string    `xorm:"not null VARCHAR(20) mobile"`
 	Bio            string    `xorm:"not null TEXT bio"`
 	BioHTML        string    `xorm:"not null TEXT bio_html"`

internal/migrations/migrations.go

@@ -104,6 +104,7 @@ var migrations = []Migration{
 	NewMigration("v1.5.1", "add plugin kv storage", addPluginKVStorage, true),
 	NewMigration("v1.6.0", "move user config to interface", moveUserConfigToInterface, true),
 	NewMigration("v1.7.0", "add optional tags", addOptionalTags, true),
+	NewMigration("v1.7.1", "expand avatar column length", expandAvatarColumnLength, false),
 }
 
 func GetMigrations() []Migration {

internal/migrations/v29.go

@@ -0,0 +1,37 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package migrations
+
+import (
+	"context"
+	"fmt"
+
+	"xorm.io/xorm"
+)
+
+func expandAvatarColumnLength(ctx context.Context, x *xorm.Engine) error {
+	type User struct {
+		Avatar string `xorm:"not null default '' VARCHAR(2048) avatar"`
+	}
+	if err := x.Context(ctx).Sync(new(User)); err != nil {
+		return fmt.Errorf("expand avatar column length failed: %w", err)
+	}
+	return nil
+}