SQL to change stable_id_idx to non unique for gene, exon, transcript and...

SQL to change stable_id_idx to non unique for gene, exon, transcript and translation stable_is tables.

sql/update_indexes.sql

+DROP INDEX stable_id_idx on exon_stable_id;
+CREATE INDEX  stable_id_idx on exon_stable_id(stable_id, version);
+DROP INDEX stable_id_idx on gene_stable_id;
+CREATE INDEX  stable_id_idx on gene_stable_id(stable_id, version);
+DROP INDEX stable_id_idx on transcript_stable_id;
+CREATE INDEX  stable_id_idx on transcript_stable_id(stable_id, version);
+DROP INDEX stable_id_idx on translation_stable_id;
+CREATE INDEX  stable_id_idx on translation_stable_id(stable_id, version);