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DB API
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The DB API defines the following methods. These methods are grouped according to which tables they access. A method followed by a list of "=>"-prefixed methods depends on the listed methods.

password

	listPasswords()
	newPassword($Password)
	getPassword($userID)
	putPassword($Password)
	deletePassword($userID)

permission

	listPermissionLevels()
	newPermissionLevel($PermissionLevel)
	getPermissionLevel($userID)
	putPermissionLevel($PermissionLevel)
	deletePermissionLevel($userID)

key

	listKeys()
	newKey($Key)
	getKey($userID)
	putKey($Key)
	deleteKey($userID)

user

	listUsers()
	newUser($User)
	getUser($userID)
	putUser($User)
	deleteUser($userID)
		=> deletePassword($userID)
		=> deletePermissionLevel($userID)
		=> deleteKey($userID)
		=> deleteUserSet($userID, *)

set

	listGlobalSets()
	newGlobalSet($GlobalSet)
	getGlobalSet($setID)
	putGlobalSet($GlobalSet)
	deleteGlobalSet($setID)
		=> deleteGlobalProblem($setID, *)
		=> deleteUserSet(*, $setID)

set_user

	listSetUsers($setID)
	listUserSets($userID)
	newUserSet($UserSet)
	getUserSet($userID, $setID)
	putUserSet($UserSet)
	deleteUserSet($userID, $setID)
		=> deleteUserProblem($userID, $setID, *)

problem

	listGlobalProblems($setID)
	newGlobalProblem($GlobalProblem)
	getGlobalProblem($setID, $problemID)
	putGlobalProblem($GlobalProblem)
	deleteGlobalProblem($setID, $problemID)
		=> deleteUserProblem(*, $setID, $problemID)

problem_user

	listProblemUsers($setID, $problemID)
	listUserProblems($userID, $setID)
	newUserProblem($UserProblem)
	getUserProblem($userID, $setID, $problemID)
	putUserProblem($UserProblem)
	deleteUserProblem($userID, $setID, $problemID)

set+set_user

	getGlobalUserSet($userID, $setID)
		=> getGlobalSet($setID)
		=> getUserSet($userID, $setID)

problem+problem_user

	getGlobalUserProblem($userID, $setID, $problemID)
		=> getGlobalProblem($setID, $problemID)
		=> getUserProblem($userID, $setID, $problemID)