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6 calls to db_drop_unique_key() in Drupal 6

system_update_6005 in modules/system/system.install
Add language to url_alias table and modify indexes.
system_update_6019 in modules/system/system.install
Reconcile small differences in the previous, manually created mysql and pgsql schemas so they are the same and can be represented by a single schema structure.
system_update_6032 in modules/system/system.install
profile_fields.name used to be nullable but is part of a unique key and so shouldn't be.
system_update_6043 in modules/system/system.install
Update table indices to make them more rational and useful.
system_update_6044 in modules/system/system.install
RC1 to RC2 index cleanup.
system_update_6055 in modules/system/system.install
Improve indexes on the {url_alias} table.