perf: optimize sqlite3 (#3074)

- use journal mode to WAL
- set locking mode to EXCLUSIVE
- set auto vacuum

ref:
 - https://www.sqlite.org/pragma.html#pragma_journal_mode
 - https://www.sqlite.org/pragma.html#pragma_locking_mode
 - https://www.sqlite.org/pragma.html#pragma_auto_vacuum

internal/bootstrap/db.go

@@ -51,7 +51,8 @@ func InitDB() {
 				if !(strings.HasSuffix(database.DBFile, ".db") && len(database.DBFile) > 3) {
 					log.Fatalf("db name error.")
 				}
-				dB, err = gorm.Open(sqlite.Open(database.DBFile), gormConfig)
+				dB, err = gorm.Open(sqlite.Open(fmt.Sprintf("%s?_journal=WAL&_locking=EXCLUSIVE&_vacuum=incremental",
+					database.DBFile)), gormConfig)
 			}
 		case "mysql":
 			{