I tried to add a db located at "/home/hc/superset/db/test.db" to superset via "Sources->Databases->Add a new record". I set "sqlite:////home/hc/superset/db/test.db" as SQLAlchemy URI, and hit "Test Connection". And it says, "ERROR: SQLite database cannot be used as a data source for security reasons."

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Superset is going to drop support for SQLLite, for now you can override this by setting PREVENT_UNSAFE_DB_CONNECTIONS = False on the config
@dpgaspar Thanks. It works!
While I looked up the setting, I found the pull request. It seems like it doesn't convert the examples to use another database tho.
Is there a reason to drop sqlite?