fix:优化项目内容

backend/app/main.py

@@ -32,27 +32,28 @@ def create_app() -> FastAPI:
     @app.on_event("startup")
     def on_startup() -> None:
         Base.metadata.create_all(bind=engine)
-        # Add new columns to finance_records if they don't exist (Module 6)
+        # Lightweight schema migrations for SQLite (add columns if missing)
         try:
             from sqlalchemy import text
             with engine.connect() as conn:
+                # finance_records: amount, billing_date
                 r = conn.execute(text("PRAGMA table_info(finance_records)"))
                 cols = [row[1] for row in r]
                 if "amount" not in cols:
                     conn.execute(text("ALTER TABLE finance_records ADD COLUMN amount NUMERIC(12,2)"))
                 if "billing_date" not in cols:
                     conn.execute(text("ALTER TABLE finance_records ADD COLUMN billing_date DATE"))
-                conn.commit()
-        except Exception:
-            pass
-        # Add customers.tags if missing (customer tags for project 收纳)
-        try:
-            from sqlalchemy import text
-            with engine.connect() as conn:
+                if "tags" not in cols:
+                    conn.execute(text("ALTER TABLE finance_records ADD COLUMN tags VARCHAR(512)"))
+                if "meta_json" not in cols:
+                    conn.execute(text("ALTER TABLE finance_records ADD COLUMN meta_json TEXT"))
+
+                # customers: tags
                 r = conn.execute(text("PRAGMA table_info(customers)"))
                 cols = [row[1] for row in r]
                 if "tags" not in cols:
                     conn.execute(text("ALTER TABLE customers ADD COLUMN tags VARCHAR(512)"))
+
                 conn.commit()
         except Exception:
             pass