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The code change in ef2670c caused tables on a postgres backend to lose the time grain selector in the table explorer (i.e. cannot see/select a time grain after this code change).
The previous code used startswith to match the database driver type (which was looking to match 'postgres' and 'postgresql').
https://github.com/airbnb/caravel/blob/8626c80d3a491b842f8262c5807154903c107747/caravel/models.py#L775
The new version requires matching the whole string so a postgresql:// uri will not match postgres.
https://github.com/airbnb/caravel/blob/ef2670ca32e8ba0a04f9dc7899db55812e2f9b46/caravel/models.py#L1365
The fix sets postgresql as the engine name. This corresponds to the sqlalchemy doc as well.