feat: redesign match play and add broadcast tooling

scripts/migrations/0001-platform.sql

@@ -0,0 +1,47 @@
+-- Platform columns and tables added in the 2026 rewrite. Idempotent: safe on
+-- databases where the old migrate-platform script already ran.
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS osu_id integer;
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS country_code text;
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS discord_id text;
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS banned_at timestamptz;
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS timezone text;
+ALTER TABLE "user" ADD COLUMN IF NOT EXISTS available_hours jsonb;
+CREATE UNIQUE INDEX IF NOT EXISTS user_osu_id_idx ON "user" (osu_id) WHERE osu_id IS NOT NULL;
+
+ALTER TABLE player_rating ADD COLUMN IF NOT EXISTS provisional boolean NOT NULL DEFAULT true;
+UPDATE player_rating SET provisional = false WHERE wins + losses >= 5 AND provisional;
+
+CREATE TABLE IF NOT EXISTS team_rating (
+	team_id uuid PRIMARY KEY REFERENCES team(id) ON DELETE CASCADE,
+	elo integer NOT NULL DEFAULT 1000,
+	wins integer NOT NULL DEFAULT 0,
+	losses integer NOT NULL DEFAULT 0,
+	updated_at timestamptz NOT NULL DEFAULT now()
+);
+
+ALTER TABLE mappool ADD COLUMN IF NOT EXISTS origin text;
+ALTER TABLE mappool ADD COLUMN IF NOT EXISTS rating real;
+
+ALTER TABLE match ADD COLUMN IF NOT EXISTS game text NOT NULL DEFAULT 'osu';
+ALTER TABLE match ADD COLUMN IF NOT EXISTS kind text NOT NULL DEFAULT 'custom';
+ALTER TABLE match ADD COLUMN IF NOT EXISTS procedure jsonb;
+ALTER TABLE match ADD COLUMN IF NOT EXISTS deadline_at timestamptz;
+ALTER TABLE match ADD COLUMN IF NOT EXISTS elo_applied boolean NOT NULL DEFAULT false;
+
+ALTER TABLE match_queue ADD COLUMN IF NOT EXISTS format integer NOT NULL DEFAULT 1;
+
+CREATE TABLE IF NOT EXISTS match_event (
+	id uuid PRIMARY KEY DEFAULT gen_random_uuid(),
+	match_id uuid NOT NULL REFERENCES match(id) ON DELETE CASCADE,
+	type text NOT NULL,
+	detail text,
+	created_at timestamptz NOT NULL DEFAULT now()
+);
+CREATE INDEX IF NOT EXISTS idx_match_event_match ON match_event (match_id, created_at);
+
+CREATE TABLE IF NOT EXISTS system_state (
+	id text PRIMARY KEY,
+	draining boolean NOT NULL DEFAULT false,
+	reason text,
+	updated_at timestamptz NOT NULL DEFAULT now()
+);