Each firing stored last_run_at = the moment the ~60 s loop noticed it,
and the next was due a whole interval after that, so every firing's
lateness carried into the next: Nightly Docker Prune moved from 05:44:45
to 05:47:05 over six days.
A firing now stores its due slot, the latest last_run_at + k * interval
not after now (due_slot), for both a launch and a skipped firing. Missed
slots after an outage are skipped, not run in a burst.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Adds cron-like recurring runs (the engine the maintenance-automation work
needs). New AnsibleSchedule model + migration 0018; a core ScheduledTask
(ansible_scheduled_runs, 60s) fires due schedules, each creating a
system-triggered AnsibleRun (triggered_by=None). Centralises the
resolve-inventory → create-run → launch flow in ansible/runner.trigger_run,
shared by the manual route (refactored to use it) and the scheduler.
Schedules UI under /ansible/schedules: create/edit/pause/delete/run-now,
with interval presets, scope targeting (all / group / target), extra-vars /
limit / tags / dry-run, and last-run status (resolved via last_run_id) +
next-run. Unit test for the due-check.
Task #549 (milestone #37).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>