1442008 - Lando should include timestamps when storing dates in the database

Status: RESOLVED FIXED

(Conduit :: Lando, enhancement)

Description

[Steven MacLeod [:smacleod]]

Lando API is storing some of the dates it tracks as "timestamp without time zone" types in the postgres database. We should ensure all the dates are being stored with timezone support (set as UTC).

Examples:
 - landoapi.models.landing:Landing.updated_at (`db.Column(db.DateTime(), nullable=False`)
 - landoapi.models.landing:Landing.created_at (`db.Column(db.DateTime(), nullable=False`)

To get proper timezone support the columns should be using something like:
```
db.Column(db.TIMESTAMP(timezone=True), server_default='NOW()', nullable=False)
```

(server_default is useful for things like created_at timestamps).