add readme for db connection management in App Runner and Task Pipeline

api/core/app/apps/README.md

@@ -0,0 +1,45 @@
+## Guidelines for Database Connection Management in App Runner and Task Pipeline
+
+Due to the presence of tasks in App Runner that require long execution times, such as LLM generation and external requests, Flask-Sqlalchemy's strategy for database connection pooling is to allocate one connection (transaction) per request. This approach keeps a connection occupied even during non-DB tasks, leading to the inability to acquire new connections during high concurrency requests due to multiple long-running tasks.
+
+Therefore, the database operations in App Runner and Task Pipeline must ensure connections are closed immediately after use, and it's better to pass IDs rather than Model objects to avoid deattach errors.
+
+Examples:
+
+1. Creating a new record:
+
+   ```python
+   app = App(id=1)
+   db.session.add(app)
+   db.session.commit()
+   db.session.refresh(app)  # Retrieve table default values, like created_at, cached in the app object, won't affect after close
+   
+   # Process related app logic
+   
+   db.session.close()
+   
+   return app.id
+   ```
+
+2. Fetching a record from the table:
+
+   ```python
+   app = db.session.query(App).filter(App.id == app_id).first()
+    
+   created_at = app.created_at
+    
+   db.session.close()
+   ```
+
+3. Updating a table field:
+
+   ```python
+   app = db.session.query(App).filter(App.id == app_id).first()
+
+   app.updated_at = time.utcnow()
+   db.session.commit()
+   db.session.close()
+
+   return app_id
+   ```
+