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6 calls to db_drop_unique_key() in Drupal 7

aggregator_update_7003 in modules/aggregator/aggregator.install
Increase the length of {aggregator_feed}.url.
node_update_7013 in modules/node/node.install
Change {node}.vid default value from 0 to NULL to avoid deadlock issues on MySQL.
search_update_7000 in modules/search/search.install
Replace unique keys in 'search_dataset' and 'search_index' by primary keys.
system_update_7042 in modules/system/system.install
Upgrade the {url_alias} table and create a cache bin for path aliases.
system_update_7073 in modules/system/system.install
Add binary to {file_managed}, in case system_update_7034() was run without it.
system_update_7078 in modules/system/system.install
Add binary to {date_formats}.format.