Django Migration Error Guide

Your Django migration blew up and the traceback means nothing to you. This explains in plain English what the error is and what Django was trying to do, says whether it's a data problem or a schema clash, and gives recovery steps ordered from least risky up. For the moment a migration fails and you're scared of making it worse.

My Django migration failed with this error: {ERROR_MESSAGE}. I was running: {MIGRATION_COMMAND}. Relevant model changes: {MODEL_CHANGES}. Database: {DATABASE_TYPE}.

Explain in plain English what this error means and what Django was trying to do when it failed. Tell me if this is a data problem, a schema conflict, or something else. Give me the steps to recover safely in order of least risk, and tell me which approaches could corrupt my data if I get them wrong.