feat(product-suite): support temporary item drafts

app/db.py

@@ -296,6 +296,8 @@ CREATE TABLE IF NOT EXISTS image_studio_projects (
   account_slug       TEXT NOT NULL,
   account_name       TEXT,
   item_id            TEXT NOT NULL,
+  storage_key        TEXT NOT NULL,
+  binding_state      TEXT NOT NULL DEFAULT 'bound',
   target_main_count  INTEGER NOT NULL DEFAULT 9,
   target_detail_count INTEGER NOT NULL DEFAULT 12,
   draft_prompt       TEXT,
@@ -480,6 +482,7 @@ def init_db(path=None, conn=None) -> None:
             _ensure_task_image_task_columns(database)
             _ensure_task_cover_reset_columns(database)
             _ensure_image_studio_project_suite_columns(database)
+            _ensure_image_studio_project_draft_columns(database)
             _ensure_image_studio_job_recovery_columns(database)
 
 
@@ -519,6 +522,32 @@ def _ensure_image_studio_project_suite_columns(database):
         )
 
 
+def _ensure_image_studio_project_draft_columns(database):
+    columns = {
+        row["name"]
+        for row in database.execute("PRAGMA table_info(image_studio_projects)").fetchall()
+    }
+    if "storage_key" not in columns:
+        database.execute("ALTER TABLE image_studio_projects ADD COLUMN storage_key TEXT")
+    if "binding_state" not in columns:
+        database.execute(
+            "ALTER TABLE image_studio_projects "
+            "ADD COLUMN binding_state TEXT NOT NULL DEFAULT 'bound'"
+        )
+    database.execute(
+        "UPDATE image_studio_projects SET storage_key = item_id "
+        "WHERE storage_key IS NULL OR TRIM(storage_key) = ''"
+    )
+    database.execute(
+        "UPDATE image_studio_projects SET binding_state = 'bound' "
+        "WHERE binding_state IS NULL OR binding_state NOT IN ('draft', 'bound')"
+    )
+    database.execute(
+        "CREATE INDEX IF NOT EXISTS idx_image_studio_projects_binding "
+        "ON image_studio_projects(binding_state, updated_at DESC)"
+    )
+
+
 def _ensure_image_studio_job_recovery_columns(database):
     columns = {
         row["name"] for row in database.execute("PRAGMA table_info(image_studio_jobs)").fetchall()