Implement change-email, email-verification, account-recovery, and welcome notifications

migrations/sqlite/2019-11-17-011009_add_email_verification/down.sql

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migrations/sqlite/2019-11-17-011009_add_email_verification/up.sql

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+ALTER TABLE users ADD COLUMN verified_at DATETIME DEFAULT NULL;
+ALTER TABLE users ADD COLUMN last_verifying_at DATETIME DEFAULT NULL;
+ALTER TABLE users ADD COLUMN login_verify_count INTEGER NOT NULL DEFAULT 0;
+ALTER TABLE users ADD COLUMN email_new TEXT DEFAULT NULL;
+ALTER TABLE users ADD COLUMN email_new_token TEXT DEFAULT NULL;