Flat graphs using Mini Graph Card

[palengh (Pål Engh)]

I came across this article.

DB image malformed. How to fix it?

Hi, after some hussel around sd card images (i.e. restoring snapshots) and some updates this errors occures: 2018-11-01 22:37:01 ERROR (SyncWorker_4) [homeassistant.components.recorder.util] Error executing query: (sqlite3.DatabaseError) database disk image is malformed [SQL: 'SELECT events.event_id AS events_event_id, events.event_type AS events_event_type, events.event_data AS events_event_data, events.origin AS events_origin, events.time_fired AS events_time_fired, events.created AS events_c…

So i deleted the db file and this error was gone. Thank you, @tom_l for pointing me in right direction.
FWIW: Why/how do this type of errors occur?