IsNoRowError checks if the error is caused by no row found in the database.

IsUniqueViolationError chec if the error code is 23505: https://www.postgresql.org/docs/current/static/errcodes-appendix.html.

Open knows how to open a database connection based on the configuration.

StatusCheck returns nil if it can successfully talk to the database.

Config is the required properties to use the database.