Adds the tier list to the default migrations.

migrations/committed/000016-tierlist.sql

@@ -0,0 +1,16 @@
+--! Previous: sha1:1390238abcc8e013a87b670fbcb3ae127a51ece8
+--! Hash: sha1:c36f619890ff43d233e58abb4c5b9d5a4e556ca3
+--! Message: tierlist
+
+ALTER TABLE UnitTier
+    --- The order in which the tiers are sorted, from most power to least power.
+    ADD COLUMN IF NOT EXISTS sortOrder SMALLSERIAL NOT NULL;
+CREATE UNIQUE INDEX IF NOT EXISTS UnitTier_SortOrder ON UnitTier (sortOrder ASC);
+
+INSERT INTO UnitTier (id, name, pullWeight, recallCost, sortOrder)
+VALUES ('s', 'S-tier', 1, 100, 0),
+       ('a', 'A-tier', 5, 50, 1),
+       ('b', 'B-tier', 10, 30, 2),
+       ('c', 'C-tier', 20, 20, 3),
+       ('d', 'D-tier', 50, 12, 4)
+ON CONFLICT (id) DO NOTHING;