Authentication workflow complete, add database link

migrations/20200928020509_states.sql

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+CREATE TABLE states (
+    id bigint PRIMARY KEY,
+    url varchar(500)
+);

migrations/20200928033759_edit-states.sql

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+-- Add migration script here
+ALTER TABLE states
+
+ADD COLUMN expires timestamptz NOT NULL DEFAULT CURRENT_TIMESTAMP + interval '1 hour';

migrations/20200928053955_make-url-not-null.sql

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+-- Add migration script here
+ALTER TABLE states
+ALTER COLUMN url SET NOT NULL;