WIP Migration script with all fixes

Dariusz Kędzierskirequested to merge
dk-migration-script-tags-support into develop

This MR contains:

  • Migration script with fixes for all bugs discovered during weekend.
  • Fixed query for custom_op resulting in None result
  • Added indexes present in new schema
  • Removed indexes not present in new schema
Edited by Dariusz Kędzierski

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