Reorder an index in unmapped_object

sql/patch_65_66_c.sql

+# patch_65_66_c.sql
+#
+# Title: Reorder an index in unmapped_object.
+#
+# Description:
+# The unique_unmapped_obj_idx index in the unmapped_object table is
+# ineffective when querying the table.  Its first part, for example,
+# partly overlaps with the id_idx index.  A reordering was suggested by
+# the Ensembl Regulation team.
+
+ALTER TABLE unmapped_object
+  DROP INDEX unique_unmapped_obj_idx,
+  ADD UNIQUE INDEX unique_unmapped_obj_idx
+    (ensembl_id, ensembl_object_type, identifier, unmapped_reason_id,
+    parent, external_db_id);
+
+# Patch identifier:
+INSERT INTO meta (species_id, meta_key, meta_value)
+  VALUES (NULL, 'patch', 'patch_65_66_c.sql|reorder_unmapped_obj_index');