How can I safely remove (and delete all on database) the plugin to start again?
I can’t read any encrypted message and I tried a few users, devices, all correctly enabled. I used PMs encrypted before but now they are not working at all.
If I try to disable the PMs I just can’t ‘delete all my encrypted messages’ and I see CSS button form not allowed to continue 
The issue seems to be related to trying to removing all devices and enable them from scratch but I’m not sure about it.
Please, sorry if it’s related to my actual configuration, I can follow your directions and test if that’s the case. I hope to help someone in similar situation.
logs
Scoped order is ignored, it's forced to be batch order.
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:292:in `act_on_ignored_order'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:215:in `in_batches'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:137:in `find_in_batches'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:70:in `find_each'
/var/www/discourse/lib/post_destroyer.rb:170:in `perform_delete'
/var/www/discourse/lib/post_destroyer.rb:77:in `destroy'
/var/www/discourse/plugins/discourse-encrypt/app/jobs/scheduled/encrypted_post_timer_evaluator.rb:25:in `block (3 levels) in execute'
/var/www/discourse/plugins/discourse-encrypt/app/jobs/scheduled/encrypted_post_timer_evaluator.rb:23:in `each'
/var/www/discourse/plugins/discourse-encrypt/app/jobs/scheduled/encrypted_post_timer_evaluator.rb:23:in `block (2 levels) in execute'
activerecord-7.0.4.3/lib/active_record/connection_adapters/abstract/transaction.rb:319:in `block in within_new_transaction'
activesupport-7.0.4.3/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
activesupport-7.0.4.3/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
activesupport-7.0.4.3/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
activesupport-7.0.4.3/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
activerecord-7.0.4.3/lib/active_record/connection_adapters/abstract/transaction.rb:317:in `within_new_transaction'
activerecord-7.0.4.3/lib/active_record/connection_adapters/abstract/database_statements.rb:316:in `transaction'
activerecord-7.0.4.3/lib/active_record/transactions.rb:209:in `transaction'
/var/www/discourse/plugins/discourse-encrypt/app/jobs/scheduled/encrypted_post_timer_evaluator.rb:9:in `block in execute'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:71:in `each'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:71:in `block in find_each'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:138:in `block in find_in_batches'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:245:in `block in in_batches'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:229:in `loop'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:229:in `in_batches'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:137:in `find_in_batches'
activerecord-7.0.4.3/lib/active_record/relation/batches.rb:70:in `find_each'
/var/www/discourse/plugins/discourse-encrypt/app/jobs/scheduled/encrypted_post_timer_evaluator.rb:8:in `execute'
/var/www/discourse/app/jobs/base.rb:292:in `block (2 levels) in perform'
rails_multisite-5.0.0/lib/rails_multisite/connection_management.rb:82:in `with_connection'
/var/www/discourse/app/jobs/base.rb:279:in `block in perform'
/var/www/discourse/app/jobs/base.rb:275:in `each'
/var/www/discourse/app/jobs/base.rb:275:in `perform'
/var/www/discourse/app/jobs/base.rb:346:in `perform'
mini_scheduler-0.16.0/lib/mini_scheduler/manager.rb:122:in `process_queue'
mini_scheduler-0.16.0/lib/mini_scheduler/manager.rb:70:in `worker_loop'
mini_scheduler-0.16.0/lib/mini_scheduler/manager.rb:59:in `block (2 levels) in ensure_worker_threads'
job Jobs::EncryptedPostTimerEvaluator