ussd/doc/data.md

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# Internals
## Version
This document describes component versions:
* `urdt-ussd` `v0.5.0-beta`
* `go-vise` `v0.2.2`
## User profile data
All user profile items are stored under keys matching the user's session id, prefixed with the 8-bit value `git.defalsify.org/vise.git/db.DATATYPE_USERDATA` (32), and followed with a 16-big big-endian value subprefix.
For example, given the sessionId `+254123` and the key `git.grassecon.net/urdt-ussd/common.DATA_PUBLIC_KEY` (2) will be stored under the key:
```
0x322b3235343132330002
prefix sessionid subprefix
32 2b323534313233 0002
```
### Sub-prefixes
All sub-prefixes are defined as constants in the `git.grassecon.net/urdt-ussd/common` package. The constant names have the prefix `DATA_`
Please refer to inline godoc documentation for the `git.grassecon.net/urdt-ussd/common` package for details on each data item.