Django Postgres memory leak

Django keeps a reference to all executed queries in a ring buffer when settings.DEBUG = True

From DEBUG ​documentation

It is also important to remember that when running with DEBUG turned on, Django will remember every SQL query it executes. This is useful when you’re debugging, but it’ll rapidly consume memory on a production server.

Setting DEBUG = False should address your issue.

To wipe the ring buffer in situations where it may pose a problem in development:

from django.db import reset_queries
if settings.DEBUG:
    reset_queries()