[general] Set max connection pool size to 1 to prevent dead lock with sqlite

src/main/resources/application.properties

@@ -20,6 +20,7 @@ spring.flyway.locations=classpath:db/migration/{vendor}
 ########## For Sqlite ##########
 spring.datasource.driver-class-name=org.sqlite.JDBC
 spring.datasource.url=jdbc:sqlite:data/db.sqlite
+spring.datasource.hikari.maximum-pool-size=1
 #auto schema update will case sqlite error
 spring.jpa.hibernate.ddl-auto=none
 spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.SQLiteDialect