Initial commit: VRBattles API

migrations/20260120000001_add_openskill_fields.sql

@@ -0,0 +1,22 @@
+-- Add OpenSkill rating fields to teams and users
+-- OpenSkill uses mu (mean skill) and sigma (uncertainty)
+-- ordinal = mu - 3*sigma (display rating)
+
+-- Add OpenSkill fields to teams
+ALTER TABLE teams ADD COLUMN IF NOT EXISTS mu REAL NOT NULL DEFAULT 25.0;
+ALTER TABLE teams ADD COLUMN IF NOT EXISTS sigma REAL NOT NULL DEFAULT 8.333;
+ALTER TABLE teams ADD COLUMN IF NOT EXISTS ordinal REAL NOT NULL DEFAULT 0.0;
+
+-- Add OpenSkill fields to users (for individual player ratings)
+ALTER TABLE users ADD COLUMN IF NOT EXISTS mu REAL NOT NULL DEFAULT 25.0;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS sigma REAL NOT NULL DEFAULT 8.333;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS ordinal REAL NOT NULL DEFAULT 0.0;
+ALTER TABLE users ADD COLUMN IF NOT EXISTS mmr REAL NOT NULL DEFAULT 1000.0;
+
+-- Update existing ordinal values based on default mu/sigma
+UPDATE teams SET ordinal = mu - (3.0 * sigma) WHERE ordinal = 0.0;
+UPDATE users SET ordinal = mu - (3.0 * sigma) WHERE ordinal = 0.0;
+
+-- Create indexes for faster ranking queries
+CREATE INDEX IF NOT EXISTS idx_teams_ordinal ON teams(ordinal DESC);
+CREATE INDEX IF NOT EXISTS idx_users_ordinal ON users(ordinal DESC);