Fix retention query performance and cleanup scheduling

src/lib/server/db/index.ts

@@ -353,6 +353,8 @@ export function db(): Database.Database {
         migrateTable(handle, 'beta_test_runs', [{ name: 'revision', ddl: 'ALTER TABLE beta_test_runs ADD COLUMN revision INTEGER NOT NULL DEFAULT 1' }]);
         migrateTable(handle, 'deployment_scripts', DEPLOYMENT_SCRIPTS_COLUMNS);
         migrateTable(handle, 'deployments', DEPLOYMENTS_COLUMNS);
+        // Older databases gain rolled_back_by above, after schema.sql runs.
+        handle.exec('CREATE INDEX IF NOT EXISTS idx_deployments_rolled_back_by ON deployments(rolled_back_by)');
         migrateTable(handle, 'server_launch_collections', [
             { name: 'mode', ddl: "ALTER TABLE server_launch_collections ADD COLUMN mode TEXT NOT NULL DEFAULT 'fill'" },
             { name: 'retained_servers', ddl: "ALTER TABLE server_launch_collections ADD COLUMN retained_servers TEXT NOT NULL DEFAULT '[]'" }