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Support deleting timeseries by name during schema upgrades (#6040)
This adds support for listing timeseries by name in a schema upgrade directory, and deleting all records (schema and data) from those timeseries during an offline ClickHouse database upgrade. The main goal here is a relatively simple but effective mechanism to clean up abandoned timeseries, while we figure out how to implement breaking changes more robustly. We alreay have examples of these abandonded timeseries in some existing installations. The existing effort to move timeseries to TOML also presents an opportunity to make one-time breaking changes for individual timeseries. Both of these can be supported with this mechanism. Fixes #5266
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