fix(deploy): distinguish core migration drift

crates/crank-registry/src/migrations/authority.rs

@@ -410,7 +410,7 @@ async fn inspect(connection: &mut PgConnection) -> Result<MigrationPreflight, Mi
         if owned_exists {
             return Err(MigrationError::new(
                 "partial_sequence",
-                "preflight.core",
+                "preflight.core_missing",
                 None,
                 "restore_known_good_backup",
             ));
@@ -549,7 +549,7 @@ async fn validate_core_ledger(connection: &mut PgConnection) -> Result<(), Migra
     if rows.len() != 1 {
         return Err(MigrationError::new(
             "partial_sequence",
-            "preflight.core",
+            "preflight.core_cardinality",
             None,
             "restore_known_good_backup",
         ));

crates/crank-registry/tests/integration/migrations.rs

@@ -937,6 +937,20 @@ async fn any_owned_relation_without_core_ledger_is_partial() {
         .unwrap();
     let error = MigrationAuthority::preflight(&pool).await.unwrap_err();
     assert_eq!(error.code(), "partial_sequence");
+    assert_eq!(error.stage(), "preflight.core_missing");
+}
+#[tokio::test]
+async fn empty_core_ledger_is_reported_separately() {
+    let database_url = crank_test_support::postgres_schema_url("test_empty_core_ledger").await;
+    let pool = sqlx::PgPool::connect(&database_url).await.unwrap();
+    MigrationAuthority::apply(&pool).await.unwrap();
+    sqlx::query("delete from __crank_core_migrations")
+        .execute(&pool)
+        .await
+        .unwrap();
+    let error = MigrationAuthority::preflight(&pool).await.unwrap_err();
+    assert_eq!(error.code(), "partial_sequence");
+    assert_eq!(error.stage(), "preflight.core_cardinality");
 }
 #[tokio::test]
 async fn current_ledger_with_structural_drift_fails_closed() {