adding great resource i found for postgresql

Author: mattmakai

databases.html

@@ -105,6 +105,7 @@ <h3>PostgreSQL resources</h3>
 is a great quickstart guide for either framework.</p>
 <p><a href="http://postgresweekly.com/">PostgreSQL Weekly</a> is a weekly newsletter of
 PostgreSQL content from around the web.</p>
+<p>This post estimates the <a href="http://hans.io/blog/2014/02/19/postgresql_connection/index.html">costs of a PostgreSQL connection</a>.</p>
 <p>Braintree wrote about their experiences <a href="https://www.braintreepayments.com/braintrust/scaling-postgresql-at-braintree-four-years-of-evolution">scaling PostgreSQL</a>. 
 The post is an inside look at the evolution of Braintree's usage of the database.</p>
 <p>There's no such thing as total security but this IBM article covers 

feeds/all.atom.xml

@@ -1,2 +1,2 @@
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+<feed xmlns="http://www.w3.org/2005/Atom"><title>Matt Makai</title><link href="http://www.fullstackpython.com/" rel="alternate"></link><link href="http://www.fullstackpython.com/feeds/all.atom.xml" rel="self"></link><id>http://www.fullstackpython.com/</id><updated>2014-02-26T15:37:53Z</updated></feed>

source/content/pages/06-databases/0601-databases.markdown

@@ -44,6 +44,8 @@ is a great quickstart guide for either framework.
 [PostgreSQL Weekly](http://postgresweekly.com/) is a weekly newsletter of
 PostgreSQL content from around the web.
 
+This post estimates the [costs of a PostgreSQL connection](http://hans.io/blog/2014/02/19/postgresql_connection/index.html).
+
 Braintree wrote about their experiences [scaling PostgreSQL](https://www.braintreepayments.com/braintrust/scaling-postgresql-at-braintree-four-years-of-evolution). 
 The post is an inside look at the evolution of Braintree's usage of the database.