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There are a few ways to automate a monthly date interval in PostgreSQL, depending on your specific needs. Here are a few options:

1. Using the date_trunc() function:

You can use the date_trunc() function to truncate a given date to a specified interval, such as 'month'. For example, to truncate the current date to the start of the current month, you could use the following query:

SELECT date_trunc('month', now());

To automate this to run on a monthly basis, you could create a scheduled job or trigger that runs this query on a specific day of the month.

1. Using the interval keyword:

You can use the interval keyword to create a date interval in PostgreSQL. For example, to create an interval of 1 month, you could use the following query:

SELECT now() + interval '1 month';

To automate this to run on a monthly basis, you could create a scheduled job or trigger that runs this query on a specific day of the month.

1. Using a recursive query:

You can also use a recursive query to generate a series of dates at monthly intervals. For example, the following query would generate a series of dates from '2022-01-01' to '2022-12-01', incremented by 1 month:

WITH RECURSIVE monthly_dates(d) AS (
  VALUES ('2022-01-01'::date)
  UNION ALL
  SELECT d + interval '1 month'
  FROM monthly_dates
  WHERE d + interval '1 month' <= '2022-12-01'::date
)
SELECT * FROM monthly_dates;

You could modify this query to generate a series of dates for a different year or date range.

Once you have generated a series of dates, you could use them in your queries as needed. For example, you could join your data to the monthly_dates table to aggregate data at a monthly level.

Overall, there are many ways to automate a monthly date interval in PostgreSQL depending on your specific needs.