Add field timezone in users to reflect user choosen timezone to parse times to

migrations/2022-01-23-075818_add_user_timezone/down.sql

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+-- This file should undo anything in `up.sql`
+alter table users
+    drop column timezone;

migrations/2022-01-23-075818_add_user_timezone/up.sql

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+-- Your SQL goes here
+alter table users
+    add timezone text;