-- Permission 2.0: user and inference task lifecycle tombstones.
-- Additive migration, safe to execute repeatedly.

ALTER TABLE users ADD COLUMN IF NOT EXISTS deleted_at TEXT;
ALTER TABLE users ADD COLUMN IF NOT EXISTS deleted_by TEXT;
ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS deleted_at TEXT;
ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS deleted_by TEXT;
ALTER TABLE eval_tasks ADD COLUMN IF NOT EXISTS created_by TEXT;
ALTER TABLE eval_tasks ADD COLUMN IF NOT EXISTS tenant_id TEXT;
ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS created_by TEXT;
ALTER TABLE compare_tasks ADD COLUMN IF NOT EXISTS tenant_id TEXT;
ALTER TABLE data_convert_tasks ADD COLUMN IF NOT EXISTS deleted_by TEXT;
ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS deleted_at TEXT;
ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS deleted_by TEXT;
ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS cleanup_attempts INTEGER NOT NULL DEFAULT 0;
ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS last_cleanup_error TEXT;
ALTER TABLE storage_objects ADD COLUMN IF NOT EXISTS last_verified_at TEXT;

CREATE INDEX IF NOT EXISTS idx_users_active ON users(status, deleted_at);
CREATE INDEX IF NOT EXISTS idx_compare_tasks_active ON compare_tasks(status, deleted_at);