feat(db): add object table

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

crates/db/migrations/0003_object.sql

@@ -0,0 +1,18 @@
+-- Catalogue objects (the inventory-minimum core). One row = one object or a group.
+CREATE TABLE object (
+    id                UUID PRIMARY KEY,
+    object_number     TEXT NOT NULL UNIQUE,
+    object_name       TEXT NOT NULL,
+    number_of_objects INTEGER NOT NULL DEFAULT 1 CHECK (number_of_objects >= 1),
+    brief_description TEXT,
+    current_location  TEXT,
+    current_owner     TEXT,
+    recorder          TEXT,
+    recording_date    DATE,
+    visibility        TEXT NOT NULL DEFAULT 'draft'
+                          CHECK (visibility IN ('draft', 'internal', 'public')),
+    created_at        TIMESTAMPTZ NOT NULL DEFAULT now(),
+    updated_at        TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE INDEX object_visibility_idx ON object (visibility);

crates/db/tests/migrate.rs

@@ -19,6 +19,18 @@ async fn migrate_is_idempotent_and_creates_audit_log(pool: PgPool) {
     assert_eq!(regclass.as_deref(), Some("audit_log"));
 }
 
+#[sqlx::test]
+async fn migrate_creates_object_table(pool: PgPool) {
+    let db = Db::from_pool(pool);
+
+    let regclass: Option<String> = sqlx::query_scalar("SELECT to_regclass('public.object')::text")
+        .fetch_one(db.pool())
+        .await
+        .unwrap();
+
+    assert_eq!(regclass.as_deref(), Some("object"));
+}
+
 #[sqlx::test]
 async fn migrate_creates_vocabulary_and_authority_tables(pool: PgPool) {
     let db = Db::from_pool(pool);