perf: refactor

internal/db/clickhouse.go

@@ -41,6 +41,10 @@ func init() {
 	}
 
 	cfg := config.Config.ClickHouse
+	if cfg.Database == "" {
+		log.Fatalf("[ClickHouse] database name is required (expected: wavelet)\n")
+	}
+
 	opts := buildClickHouseOptions()
 
 	var err error
@@ -148,4 +152,4 @@ func SetChDBForTest(d *gorm.DB) {
 // SetChConnForTest sets the package-level native ClickHouse connection for testing.
 func SetChConnForTest(c driver.Conn) {
 	ChConn = c
-}
+}