-- 0007_manual_schedules.sql
--
-- Unify "what does this host back up?" under schedules. Drop the
-- legacy host.default_paths column in favour of a `manual` flag on
-- schedules: a manual schedule carries paths/excludes/tags/retention
-- like any other but has no cron expression — it only fires when
-- the operator clicks Run-now.
--
-- Steps (each is a single ALTER, no table rebuilds):
--   1. Add schedules.manual.
--   2. For every host with non-empty default_paths, create a manual
--      schedule seeded with those paths and bump host_schedule_version
--      so the next push reaches the agent.
--   3. ALTER TABLE hosts DROP COLUMN default_paths.
--   4. ALTER TABLE enrollment_tokens RENAME COLUMN default_paths
--      TO initial_paths.
--
-- The earlier draft of this migration rebuilt hosts via the
-- create-new + drop-old + rename pattern. With foreign_keys=ON
-- (which the connection DSN sets), DROP TABLE on the parent
-- triggered ON DELETE CASCADE on every child of hosts(id) — the
-- smoke env lost schedules / jobs / snapshots / host_credentials
-- as a result. SQLite 3.35+ supports column-level ALTERs, so we
-- skip the rebuild entirely and avoid the cascade trap.

ALTER TABLE schedules ADD COLUMN manual INTEGER NOT NULL DEFAULT 0;

INSERT INTO schedules (
  id, host_id, kind, cron_expr,
  paths, excludes, tags, retention_policy, options,
  pre_hook, post_hook, enabled, manual, created_at, updated_at
)
SELECT
  lower(hex(randomblob(13))),
  id, 'backup', '',
  default_paths, '[]', '[]', '{}', '{}',
  '', '', 1, 1,
  strftime('%Y-%m-%dT%H:%M:%fZ', 'now'),
  strftime('%Y-%m-%dT%H:%M:%fZ', 'now')
FROM hosts
WHERE default_paths IS NOT NULL
  AND default_paths != ''
  AND default_paths != '[]';

INSERT INTO host_schedule_version (host_id, version)
  SELECT id, 1 FROM hosts
  WHERE default_paths IS NOT NULL
    AND default_paths != ''
    AND default_paths != '[]'
ON CONFLICT(host_id) DO UPDATE SET version = version + 1;

ALTER TABLE hosts DROP COLUMN default_paths;
ALTER TABLE enrollment_tokens RENAME COLUMN default_paths TO initial_paths;