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Postgresql provides several date/time functions that can be used to group data by time interval with a level of accuracy as specific as milliseconds. Here is an example:

SELECT 
  date_trunc('milliseconds', timestamp_column) AS interval_start, 
  count(*) AS count 
FROM table_name 
GROUP BY interval_start;

In this example, the date_trunc function is used to truncate the timestamp column to milliseconds precision, so that data is grouped by each millisecond interval. The count function is used to count the number of rows that fall within each interval.

Note that depending on the size of your data, grouping by milliseconds may result in a large number of intervals, so you may want to consider grouping by a larger time interval (e.g. seconds) instead.