Add destructive migration to database downgrade #217
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Added a destructive migration whenever db downgrade from any versions.
This might not really be scalable as we need to add one more drop table in
onDowngrade
we have new table. A better solution might be to query the sqlite master table for tables names then recursively drop them one by one. Since we only have 3 tables for now, I made a conscious decision not to do early abstraction.I also added a integration test with the database to make sure the downgrade and upgrade went smoothly.
Attempt to fix #216