Make database connection string clearer

[bytrangle]

Description

For the connection string to Timescale DB, I enclosed username, password, host and port in angle brackets to indicate to readers that they are not meant to be inserted verbatim and users should add in their own user configs.

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[billy-the-fish]

Nice PR. Suggested the tiny change so the string matches the migration docs: https://docs.timescale.com/migrate/latest/pg-dump-and-restore/.

[billy-the-fish]

Suggested change

	'postgres://<user>:<pass>@<host>:<port>/<dbname>'
	'postgres://<user>:<password>@<host>:<port>/<dbname>'

[billy-the-fish]

Suggested change

	const sequelize = new Sequelize('postgres://<user>:<pass>@<host>:<port>/<dbname>',
	const sequelize = new Sequelize('postgres://<user>:<password>@<host>:<port>/<dbname>',