* invalidate read buffer after truncate

* no accesslog for truncate (included in setattr)

* use sql database as meta store

* pass simple tests

* use bytes for chunks

* use bytes for chunks

* cleanup trasaction

* cleanup

* add unit test for SQL

* cleanup

* cleanup

* fix build

* use db as meta store

* fix contention

* fix truncate and compaction

* fix contension on counter

* generate id in batch

* fix build

* fix test

* fix flaky test

* support mysql

* fix ci

* fix flaky test

* test with sqlite3

* update column as notnull

* remove passwd

* update metrics

* fix nextInode and deleted files