Add cancellation for collection launches

src/lib/server/db/index.ts

@@ -368,6 +368,7 @@ export function db(): Database.Database {
         // 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: 'cancelled_at', ddl: 'ALTER TABLE server_launch_collections ADD COLUMN cancelled_at TEXT' },
             { 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 '[]'" }
         ]);

src/lib/server/db/schema.sql

@@ -581,6 +581,7 @@ CREATE TABLE IF NOT EXISTS server_launch_collections (
     id TEXT PRIMARY KEY,
     name TEXT NOT NULL,
     created_at TEXT NOT NULL,
+    cancelled_at TEXT,
     mode TEXT NOT NULL DEFAULT 'fill',
     retained_servers TEXT NOT NULL DEFAULT '[]',
     retained_server_deletions TEXT NOT NULL DEFAULT '{}'