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Add a new function, `alter_data_node()`, which can be used to change a data node's configuration on the access node, including connection information like host, port, and database. In addition, the function allows marking a data node as "unavailable", which means the node should no longer be used for reads and writes. Only read "failover" is implemented as part of this change, however. To fail over reads, the alter data node function finds all the chunks for which the unavailable data node is the "primary" query target and sets a chunk replica on another data node to use instead. If some chunks do not have a replica to fail over to, a warning will be raised. When a data node is available again, the function can be used to switch back to once again use the data node for queries. Closes timescale#2104
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