Add multi-species support.

sql/patch_50_51_d.sql

+# patch_50_51_d.sql
+#
+# Title: make database multi-species capable
+#
+# Description:
+#   Add a species_id column to the meta and coord_system table and make
+#   new indexes on these tables.
+
+-- Add the new species_id column after meta_id
+ALTER TABLE meta ADD COLUMN
+ species_id INT UNSIGNED DEFAULT 1 -- Default species_id is 1
+                                   -- NULL means "not species specific"
+ AFTER meta_id;
+
+-- Redo the indexes on the meta table
+ALTER TABLE meta DROP INDEX key_value;
+ALTER TABLE meta DROP INDEX meta_key_index;
+ALTER TABLE meta DROP INDEX meta_value_index;
+
+ALTER TABLE meta
+ ADD UNIQUE INDEX species_key_value_idx (species_id, meta_key, meta_value);
+ALTER TABLE meta
+ ADD INDEX species_value_idx (species_id, meta_value);
+
+-- Add the species_id column to coord_system table
+-- Default species_id is 1
+ALTER TABLE coord_system ADD COLUMN species_id INT(10) UNSIGNED NOT NULL DEFAULT 1 AFTER coord_system_id;
+
+-- Drop the indexes from coord_system
+ALTER TABLE coord_system DROP INDEX rank;
+ALTER TABLE coord_system DROP INDEX name;
+
+-- Add new indexes to coord_system
+ALTER TABLE coord_system ADD UNIQUE INDEX rank_idx (rank, species_id);
+ALTER TABLE coord_system ADD UNIQUE INDEX name_idx (name, version, species_id);
+ALTER TABLE coord_system ADD        INDEX species_idx (species_id);
+
+-- Optimize the modified tables
+OPTIMIZE TABLE meta;
+OPTIMIZE TABLE coord_system;
+
+# patch identifier
+INSERT INTO meta (meta_key, meta_value) VALUES ('patch', 'patch_50_51_d.sql|multispecies');
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