1. Add a timestamp for comment editing/deletion and an ID of the last user
who edited a comment:

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ALTER TABLE PackageComments
	ADD COLUMN EditedTS BIGINT UNSIGNED NULL DEFAULT NULL,
	ADD COLUMN EditedUsersID INTEGER UNSIGNED NULL DEFAULT NULL,
	ADD FOREIGN KEY (EditedUsersID) REFERENCES Users(ID) ON DELETE SET NULL;
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2. Add a field to store the ID of the last user who flagged a package
out-of-date:

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ALTER TABLE PackageBases
	ADD COLUMN FlaggerUID BIGINT UNSIGNED NULL DEFAULT NULL;
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