fix: migration issues

* fix: flows migration

Set the `flows.data` column type to text instead of a string
with specific size because doing the latter fails on MySQL/MariaDB.

* fix: fix down migrations

Author: lfleischmann

backend/persistence/migrations/20240530122100_change_tokens.down.fizz

@@ -1,3 +1,4 @@
+drop_foreign_key("tokens", "tokens_identities_id_fk")
 drop_column("tokens", "identity_id")
 drop_column("tokens", "is_flow")
 drop_column("tokens", "user_created")

backend/persistence/migrations/20240717020707_change_flows.up.fizz

@@ -1,4 +1,4 @@
-add_column("flows", "data", "string", {"size": 65536})
+add_column("flows", "data", "text")
 drop_column("flows", "stash_data")
 drop_column("flows", "current_state")
 drop_column("flows", "previous_state")

backend/persistence/migrations/20241118114500_change_webauthn_credentials.down.fizz

@@ -1,4 +1,5 @@
-drop_foreign_key("webauthn_credentials", "webauthn_credential_user_handle_fkey", {"if_exists": false})
+drop_foreign_key("webauthn_credentials", "webauthn_credential_user_handle_fkey")
+drop_foreign_key("webauthn_credentials", "webauthn_credentials_webauthn_credential_user_handles_id_fk")
 drop_column("webauthn_credentials", "user_handle_id")
 drop_table("webauthn_credential_user_handles")
 

backend/persistence/migrations/20250313160348_change_flows.down.fizz

@@ -0,0 +1 @@
+change_column("flows", "data", "text")