Data properties config, Max payload size, types, mem/disk file.

[gideonw]

Create client and server side checks and configs for the properties of data.

• Max payload size
  • Allow the database to set a limit on the size of a single record.
• mem/disk
  • Allows the running of the database in memory, or
  • Allows the running of the database on disk

Simple safe guards and settings to allow for tuning of the performance.