Brand new SPQR 1.5.0

[Denchick]

Hi! Our team has done a lot of work recently. Here are some of the main areas that we have been working on.

SPQR 2.0 news
Most of the features for SPQR 2.0 have been implemented, but there's still work to do on multidimensional key ranges and multi-column sharding.

Fault Tolerance
We have identified a significant issue with the stability of the router. The outage of one of our data centers has had a negative impact on the performance of the router. In SPQR, we rely on shards being high-availability PostgreSQL clusters hosted in at least three geographically distributed data centers. We have made important updates to fix this issue.

Extended Protocol perfomance
In this release, we have seen an increase in the performance of the router with prepared statements of approximately 20%. This was tested using the TPC-B benchmark.

Documentation
Starting with this release, SPQR now has its own documentation! You can find it at https://pg-sharding.tech/.

We still have a lot of room for improvement. The full list of changes can be found in the release notes. Many thanks to @diPhantxm @reshke @visill and @Denchick!

Stay tuned!