Add Timezone to user data

files/db/update_v9_to_v10.sql

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+ALTER TABLE users ADD COLUMN timezone char(64) AFTER language;
+ALTER TABLE users MODIFY COLUMN email VARCHAR(320) NOT NULL;
+ALTER TABLE users ADD COLUMN frequency VARCHAR(1) NOT NULL AFTER active;
+UPDATE users SET timezone = 'Europe/Paris', frequency = 'P';
+
+ALTER TABLE projects MODIFY COLUMN timezone char(64);