[R-SIG-Finance] A time-series DBMS for R users

[Leonardo Silvestri]

Hi,

I'd like to announce the alpha release of ztsdb, an open-source 
time-series database management system that is very tightly integrated 
with R. It should be well-suited for handling financial time-series 
data, so potentially of interest to some of you.

The query and manipulation language of ztsdb is a subset of R which 
makes it possible to integrate ztsdb seamlessly with R. For example, 
from an R session, given a connection 'c1' to a remote ztsdb instance 
and a time-series 'z' on that remote instance, one can query the 
database from the R command line with unquoted expressions. Here are a 
few examples:

## get z's last 6 observations (translates to an 'xts' time series):
c1 ? tail(z)

## get the 2016 subset of 'z':
c1 ? z[as.interval("+2016-01-01 00:00:00 America/New_York -> 2017-01-01 
00:00:00 America/New_York-"), ]

## get the 2016 median-minute aggregation of 'z' and assign it to 'mm':
mm <- c1 ? { start <- as.time("2016-01-01 12:00:00 America/New_York")
              end <- `+`(start, as.period("1y"), tz="America/New_York")
              s <- seq(from=start, to=end, by=as.duration("00:01:00"))
              align(z, s, method="median") }

It has a coherent and rich representation of date/time with nanosecond 
precision and built-in time-zone awareness.

Additional features include seamless connectivity with other ztsdb 
database instances, continuous/streaming updates and C/C++ fast data 
append operations.

More information can be found here:
- project website: http://www.ztsdb.org/
- release notes: http://www.ztsdb.org/blog/blog-2016-12-30-first.html
- Gitlab ztsdb project page: https://gitlab.com/lsilvest/ztsdb
- Gitlab R package project page: https://gitlab.com/lsilvest/rztsdb
- Docker repo: https://hub.docker.com/r/lsilvest/ztsdb/

Leo