Document the process to roll over to the next year

ROLLING OVER.md

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+Export any reports you want to keep.
+
+Take a database dump.
+
+Remove all accounts, tickets, invoices, talks, etc. I used the commands below, but this may be simpler to achieve by selecting the relevant users in the Django Admin, selecting "Delete" and letting the cascading deletes deal with it.
+
+```
+Replace USERNAMES_TO_KEEP with an array of staff usernames.
+
+$ sudo -u postgres psql symposion
+delete from registrasion_lineitem;
+delete from registrasion_manualpayment;
+delete from registripe_stripepayment;
+delete from registrasion_creditnote;
+delete from registrasion_paymentbase;
+delete from registrasion_invoice;
+delete from registrasion_cart_vouchers;
+delete from registrasion_productitem;
+delete from registrasion_discountitem;
+delete from registrasion_cart;
+delete from pinaxcon_registrasion_attendeeprofile;
+delete from registrasion_attendeeprofilebase;
+delete from registrasion_attendee;
+
+delete from proposals_aiandmachinelearningproposal;
+delete from proposals_diversityequityandinclusionproposal;
+delete from proposals_fossandarm64proposal;
+delete from proposals_fossfundingandeconomicsproposal;
+delete from proposals_fossindailylifeproposal;
+delete from proposals_fossineducationproposal;
+delete from proposals_keynotepanelproposal;
+delete from proposals_licensingandlegalissuesproposal;
+delete from proposals_memberprojectsproposal;
+delete from proposals_mobiledeviceuserfreedomproposal;
+delete from proposals_reproducibilityproposal;
+delete from proposals_righttorepairproposal;
+delete from proposals_scienceofcommunityproposal;
+delete from proposals_seleniumproposal;
+delete from proposals_supportingusergroupsproposal;
+delete from proposals_talkproposal;
+delete from proposals_tutorialproposal;
+delete from proposals_wildcardproposal;
+delete from proposals_xmppproposal;
+
+delete from symposion_reviews_proposalresult;
+delete from symposion_reviews_resultnotification;
+delete from symposion_schedule_presentation_additional_speakers;
+delete from symposion_schedule_presentation;
+delete from symposion_reviews_latestvote;
+delete from symposion_reviews_proposalmessage;
+delete from symposion_proposals_additionalspeaker;
+delete from symposion_proposals_supportingdocument;
+delete from symposion_proposals_proposalbase;
+
+delete from account_account where user_id in (select id from auth_user where username not in USERNAMES_TO_KEEP);
+delete from account_emailconfirmation;
+delete from account_emailaddress where user_id in (select id from auth_user where username not in USERNAMES_TO_KEEP);
+
+delete from symposion_speakers_speaker;
+delete from reversion_version;
+delete from reversion_revision;
+delete from teams_membership;
+delete from pinax_stripe_card;
+delete from pinax_stripe_charge;
+delete from pinax_stripe_customer;
+delete from django_admin_log;
+
+delete from auth_user where username not in USERNAMES_TO_KEEP;
+```
+
+Set any remaining account `completed_registration` to false.
+
+Add a new Conference entry in Django Admin and update the `CONFERENCE_ID` in pinaxcon/settings.py. Also update the conference dates.
+
+Find and update all uses of 2025 and the conference dates in this codebase.
+
+Update flatpages such as the "/" home page.
+
+Update the Django "site" in the Admin.