This updates the migration to have one index on student_module_id. Previously we had one index on stage and production of edx.org but two indexes on other envs. This change is to make sure we have one index on every env. But this change drops the index and create a new index, so if you have set ENABLE_CSMH_EXTENDED to True and have coursewarehistoryextended_studentmodulehistoryextended in a separate db and you want to avoid rebuilding the index, you can fake this migration.
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