fix: postgres columns with timezone

Add timezone for the columns creation_date and update_date, otherwise
it's difficult to compare the times correctly in the unit test.

Furthermore the default value of the creation_date will now be defined
by the postgres implementation of the database interface.

go.sum

@@ -44,6 +44,9 @@ github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw
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@@ -64,6 +67,10 @@ github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t
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@@ -78,6 +85,8 @@ github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
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@@ -180,6 +189,10 @@ gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
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