- create_if_not_exists index(:conversation_participations, [:conversation_id])
- create_if_not_exists unique_index(:conversation_participations, [:user_id, :conversation_id])
- create_if_not_exists unique_index(:conversations, [:ap_id])
+ create_if_not_exists(index(:conversation_participations, [:conversation_id]))
+ create_if_not_exists(unique_index(:conversation_participations, [:user_id, :conversation_id]))
+ create_if_not_exists(unique_index(:conversations, [:ap_id]))