我正在尝试将 Flask 应用程序部署到 Heroku。我已经推送到 Heroku 并且可以访问我的登录页面，但是对 db 的任何调用都会给出 OperationalError：
2014-01-29T12:12:31.801772+00:00 app[web.1]: OperationalError: (OperationalError) no such table: projects_project u'SELECT
使用 Flask-migrate 我可以成功运行本地迁移和升级：
INFO [alembic.migration] Context impl PostgresqlImpl.
INFO [alembic.migration] Will assume transactional DDL.
INFO [alembic.migration] Running upgrade None -> 4b56d58e1d4c, empty message
当我尝试使用升级在 Herokuheroku run python manage.py db upgrade上升级时，似乎发生了，但是 Context impl. 现在是 SQLite？：
(dev01)Toms-MacBook-Pro:dev01 kt$ heroku run python manage.py db upgrade
Running `python manage.py db upgrade` attached to terminal... up, run.9069
INFO [alembic.migration] Context impl SQLiteImpl.
INFO [alembic.migration] Will assume non-transactional DDL.
INFO [alembic.migration] Running upgrade None -> 4b56d58e1d4c, empty message
运行Heroku pg:info给出：
=== HEROKU_POSTGRESQL_PINK_URL (DATABASE_URL)
Plan: Dev
Status: available
Connections: 0
PG Version: 9.3.2
Created: 2014-01-27 18:55 UTC
Data Size: 6.4 MB
Tables: 0
Rows: 0/10000 (In compliance)
Fork/Follow: Unsupported
Rollback: Unsupported
Heroku 升级的相关日志为：
2014-01-29T12:55:40.112436+00:00 heroku[api]: Starting process with command `python manage.py db upgrade` by kt@gmail.com
2014-01-29T12:55:44.638957+00:00 heroku[run.9069]: Awaiting client
2014-01-29T12:55:44.667692+00:00 heroku[run.9069]: Starting process with command `python manage.py db upgrade`
2014-01-29T12:55:44.836337+00:00 heroku[run.9069]: State changed from starting to up
2014-01-29T12:55:46.643857+00:00 heroku[run.9069]: Process exited with status 0
2014-01-29T12:55:46.656134+00:00 heroku[run.9069]: State changed from up to complete
另外，heroku config给我：
(dev01)Toms-MacBook-Pro:dev01 kt$ heroku config
=== myapp Config Vars
DATABASE_URL: postgres://xxx.compute-1.amazonaws.com:5432/da0jtkatk6057v
HEROKU_POSTGRESQL_PINK_URL: postgres://xxx.compute-1.amazonaws.com:5432/da0jtkatk6057v
where [xxx == xxx]
上下文实现如何。放？除了在本地工作和 heroku 之间存在明显差异之外，我无法弄清楚发生了什么或应该如何调试。谢谢。