help with foreignkeys

so i have this 2 models (Comment and Park)

Comment has a foreign key to USER and PARK

PARK has a foreign key to Comment

my question is, isn't there going to be a deadlock if i don't have a comment or a park created? i mean , in order to create a Park i need to have a comment, and in order to create a comment i need a park and a user.

is there a way for me to fix my problem? like allowing the foreign key to be null or something like that?

thanks in advance

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