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   1  -- Rename the primary unique index from PRIMARY to ls_field_val
   2  -- This is for MySQL only and is necessary only for databases which were updated
   3  -- between MW 1.16 development revisions r50567 and r51465.
   4  ALTER TABLE /*_*/log_search
   5      DROP PRIMARY KEY,
   6      ADD UNIQUE INDEX ls_field_val (ls_field,ls_value,ls_log_id);
   7