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Great slides, thanks for sharing!
The files 1 and 3 are the same with different welcome picture.
1. PostgreSQL, When It’s Not Your Job
3. PostgreSQL Proficiency for Python People
It’s ok? or some sort of silly mistake? ;)
the build is christophe pettus' software development blog. it has an rss feed. christophe is ceo of PostgreSQL Experts, Inc.