feat: implement group filter management with caching and database integration

database/db.go

@@ -0,0 +1,29 @@
+package database
+
+import (
+	"log"
+	"os"
+	"path/filepath"
+
+	"gorm.io/driver/sqlite"
+	"gorm.io/gorm"
+	"gorm.io/gorm/logger"
+)
+
+var DB *gorm.DB
+
+func InitDB(dbPath string) {
+	err := os.MkdirAll(filepath.Dir(dbPath), 0755)
+	if err != nil {
+		log.Fatalf("Failed to create database directory: %v", err)
+	}
+
+	db, err := gorm.Open(sqlite.Open(dbPath), &gorm.Config{
+		Logger: logger.Default.LogMode(logger.Silent),
+	})
+	if err != nil {
+		log.Fatalf("Failed to connect to database: %v", err)
+	}
+
+	DB = db
+}

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{})
+}