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maziggy
724bc92c22
Multi-plate batches scheduled to the same H2D Pro were triple-dispatched
within ~60 s — observed in user logs as queue items 139/140/141 all
flipping to status='printing' even though the printer was still
digesting the first project_file (FINISH for 80-210 s before flipping
to PREPARE). The DB busy_printers seed at print_scheduler.py:145 was
empirically missing the in-flight items in this window; without
database access I cannot pin the exact why, but the guard is unreliable.
Add a defensive in-memory dispatch hold:
- _start_print captures (dispatched_at, pre_state, pre_subtask_id) per
printer
- check_queue augments busy_printers with any printer still inside its
hold window (60 s minimum cooldown, 180 s hard timeout)
- _watchdog_print_start releases the hold once it observes a state or
subtask_id transition (success path), or on the existing 90 s revert
(unhappy path), or on disconnect
Pure additive — alongside the existing seed query and _is_printer_idle.
Doesn't depend on DB row visibility or on_print_complete firing
correctly. Per-printer isolated. Watchdog kept as @staticmethod so the
existing 12 watchdog tests pass unchanged; hold-release calls go
through the module-level scheduler instance.