feat: 完善 MVP-2 演示和进度体验

tests/unit/test_db_stability.py

@@ -1,6 +1,6 @@
 import pytest
 
-from app.db import check_database_integrity, checkpoint_sqlite_wal, create_sqlite_engine
+from app.db import check_database_integrity, checkpoint_sqlite_wal, create_sqlite_engine, ensure_sqlite_schema_compat
 
 
 def test_check_database_integrity_returns_ok_for_valid_sqlite_database():
@@ -63,3 +63,20 @@ def test_checkpoint_sqlite_wal_skips_in_memory_database():
         assert checkpoint_sqlite_wal(engine) is False
     finally:
         engine.dispose()
+
+
+def test_ensure_sqlite_schema_compat_adds_progress_columns_to_existing_tasks_table(tmp_path):
+    db_path = tmp_path / "legacy.db"
+    engine = create_sqlite_engine(f"sqlite:///{db_path}")
+    try:
+        with engine.begin() as connection:
+            connection.exec_driver_sql("CREATE TABLE tasks (id VARCHAR(36) PRIMARY KEY, platform VARCHAR(32) NOT NULL)")
+
+        ensure_sqlite_schema_compat(engine)
+
+        with engine.connect() as connection:
+            columns = {row[1] for row in connection.exec_driver_sql("PRAGMA table_info(tasks)").all()}
+        assert "current_stage" in columns
+        assert "last_progress_at" in columns
+    finally:
+        engine.dispose()