it’s not safe to disable SQLite’s thread safety as you do here: https://github.com/PackOrganization/Pack/blob/main/Libraries... and then do your own locking. You attempt to pass the flag at open time to enable serialized mode, however quoting the SQLite docs for the build flag you set:

  Note that when SQLite is compiled with SQLITE_THREADSAFE=0, the code to make SQLite threadsafe is omitted from the build. When this occurs, it is impossible to change the threading mode at start-time or run-time.

SQLite’s APIs are often hazardous in these ways, it really should be erroring rather than silently ignoring the fullmutex flag, but alas.