Function drop_phase 

pub(crate) async fn drop_phase(
    client: &Client,
    profile_name: &str,
    project_name: &str,
    in_project_databases: &BTreeSet<String>,
) -> Result<(), CliError>

Phase 1 of the dev rebuild: drop every overlay database recorded for this (profile, project) pair, then purge the manifest rows. Finally sweep any in-project <base_db>__<profile> names not in the manifest (catalog restore, interrupted prior run).