Migration from 8.xx to 20.xx

yep, took a bit time but finally i did migration.
We had 8.2.2. old school non dockerized sentry.
i created new 9.1.2 dockerized instance, exported postgres dump from old instance and imported into new instance postgres (as new database).
Configurated docker-compose to use that database instead of defaut postgres. Started docker-compose, when executed “sentry upgrade” under web container. After that i had working 9.1.2 instance with migrated users&projects etc.
Then, I couldn’t upgrade directly to newest version, so i did couple upgrades in between till managed to upgrade to newest one. Finally got it working, the only thing to mention, that application’s have to use newer version of sentry library, as there was changes in sentry api.

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