Optimize Database, improve SNO API performance

[Alexey]

Mine is 76MiB on the oldest node… But I lost DBs once when I have tried to migrate to Linux:

Moving from Windows to Ubuntu and back

Continuing the discussion from Moving the Node from Windows to Raspberry PI3: I would add my personal experience with NTFS on Linux. Due to the forced update of Windows 10 to the next release, my system became unstable: it crashed into BSOD, rolled back the update, but since this update is mandatory, Windows is updated to the next release, crashes to BSOD and everything repeats. After a day of such behavior and inability to prevent an upgrade, I decided to migrate to Linux, since this system …