feat: tournament DB schema

Add tournaments, tournament_entries, and tournament_matches tables
with Drizzle ORM definitions and SQLite CREATE TABLE migrations.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

server/src/db/startup.ts

@@ -1,4 +1,5 @@
 import { sqlite } from './index.js'
+import { logger } from '../lib/logger.js'
 
 export function runMigrations() {
   sqlite.exec(`
@@ -86,6 +87,45 @@ export function runMigrations() {
     );
   `)
 
+
+  sqlite.exec(`
+    CREATE TABLE IF NOT EXISTS tournaments (
+      id TEXT PRIMARY KEY,
+      name TEXT NOT NULL,
+      format TEXT NOT NULL DEFAULT 'single_elim',
+      size INTEGER NOT NULL,
+      entry_sats INTEGER NOT NULL DEFAULT 0,
+      prize_sats INTEGER NOT NULL DEFAULT 0,
+      status TEXT NOT NULL DEFAULT 'open',
+      current_round INTEGER NOT NULL DEFAULT 0,
+      season_id TEXT,
+      created_at TEXT NOT NULL,
+      started_at TEXT,
+      finished_at TEXT
+    );
+
+    CREATE TABLE IF NOT EXISTS tournament_entries (
+      id TEXT PRIMARY KEY,
+      tournament_id TEXT NOT NULL REFERENCES tournaments(id),
+      bot_id TEXT NOT NULL REFERENCES bots(id),
+      seed INTEGER NOT NULL DEFAULT 0,
+      eliminated INTEGER NOT NULL DEFAULT 0,
+      created_at TEXT NOT NULL
+    );
+
+    CREATE TABLE IF NOT EXISTS tournament_matches (
+      id TEXT PRIMARY KEY,
+      tournament_id TEXT NOT NULL REFERENCES tournaments(id),
+      round INTEGER NOT NULL,
+      match_index INTEGER NOT NULL,
+      bot_a_id TEXT REFERENCES bots(id),
+      bot_b_id TEXT REFERENCES bots(id),
+      fight_id TEXT REFERENCES fights(id),
+      winner_id TEXT REFERENCES bots(id),
+      status TEXT NOT NULL DEFAULT 'pending'
+    );
+  `)
+
   // Column migrations for existing databases
   const migrations = [
     "ALTER TABLE bots ADD COLUMN archetype TEXT NOT NULL DEFAULT 'standard'",
@@ -120,5 +160,5 @@ export function runMigrations() {
     sqlite.exec("UPDATE bots SET bot_type = 'classic' WHERE webhook_url LIKE 'http://classic.local%' AND bot_type = 'regular'")
   } catch { /* ok */ }
 
-  console.log('[botfights] database migrated')
+  logger.info('db', 'database migrated')
 }