SQL block could use some love to be prod ready

[iantbutler01]

@kallsyms we can talk about some ways to shore this up when we sync next

• Connections are not pooled by default
• Cursor should probably use RealDictCursor
• Provide some context managed niceties around checking out a connection from a pool, e.g.

    @contextlib.contextmanager
    def get_connection(self):
        conn = self.connection_pool.getconn()
        try:
            yield conn
        finally:
            self.connection_pool.putconn(conn)

    @contextlib.contextmanager
    def get_cursor(self):
        with self.get_connection() as conn:
            cursor = conn.cursor(cursor_factory=RealDictCursor)
            try:
                yield cursor
            finally:
                conn.commit()
                cursor.close()

[iantbutler01]

My only thing is how these changes would interact with say SQLAlchemy if someone wants to use our stuff there