New to the community here and already love the product. I am using superset 
v-0.26.3 and migrated the backend database from sqllite to mysql. After the 
migration, I created a few charts from a datasource (mysql). When I added few 
more rows on the underlying datasource, the corresponding charts did not 
refresh (I tried with different refresh frequencies on the dashboard). That 
said, when I go to the table view I do see the new rows being added.

I do see a chart "Altered sign" on the chart and when I click that to see the 
url_params control before and after is N/A and empty dictionary (please see the 
screenshots below). Started superset in debug mode (my config file pasted 
below) to check for any errors but no luck. Any pointers on how do I debug this 
issue?

![screen shot 2018-08-21 at 11 57 11 
am](https://user-images.githubusercontent.com/34170284/44423367-d2e96f00-a53a-11e8-914f-0786c3e8d3e3.png)
![screen shot 2018-08-21 at 11 58 06 
am](https://user-images.githubusercontent.com/34170284/44423369-d5e45f80-a53a-11e8-88d6-9a4cad969dc3.png)




### Superset version
0.26.3 


superset_config.py file looks like:

#---------------------------------------------------------
# Superset specific config
#---------------------------------------------------------
ROW_LIMIT = 5000

SUPERSET_WEBSERVER_PORT = 5000
#---------------------------------------------------------

#---------------------------------------------------------
# Flask App Builder configuration
#---------------------------------------------------------
# Your App secret key
SECRET_KEY = <secret key>

# The SQLAlchemy connection string to your database backend
# This connection defines the path to the database that stores your
# superset metadata (slices, connections, tables, dashboards, ...).
# Note that the connection information to connect to the datasources
# you want to explore are managed directly in the web UI
#SQLALCHEMY_DATABASE_URI = 'sqlite:////home/<user>/.superset/superset.db'
SQLALCHEMY_DATABASE_URI = 'mysql://<user>:<password>@<host>/superset'

# Flask-WTF flag for CSRF
WTF_CSRF_ENABLED = True
# Add endpoints that need to be exempt from CSRF protection
WTF_CSRF_EXEMPT_LIST = []
# A CSRF token that expires in 1 year
WTF_CSRF_TIME_LIMIT = 60 * 60 * 24 * 365

# Set this API key to enable Mapbox visualizations
MAPBOX_API_KEY = ''

LOG_FORMAT = '%(asctime)s:%(levelname)s:%(name)s:%(message)s'
LOG_LEVEL = 'DEBUG'
ENABLE_TIME_ROTATE = False
TIME_ROTATE_LOG_LEVEL = 'DEBUG'
FILENAME = os.path.join(DATA_DIR, 'log', 'superset.log')
ROLLOVER = 'midnight'
INTERVAL = 1
BACKUP_COUNT = 30



[ Full content available at: 
https://github.com/apache/incubator-superset/issues/5689 ]
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