feat: implement group filter management with caching and database integration

database/models.go

@@ -0,0 +1,14 @@
+package database
+
+import "gorm.io/gorm"
+
+type Filter struct {
+	gorm.Model
+	Key     string `gorm:"type:varchar(255);uniqueIndex:idx_group_key"`
+	GroupID string `gorm:"type:varchar(255);uniqueIndex:idx_group_key"`
+	Content string `gorm:"type:text"`
+}
+
+func AutoMigrate() {
+	DB.AutoMigrate(&Filter{})
+}