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1b5a816022
This implements the hook concurrency plan from TODO_hook_concurrency.md: ## Schema Changes - Add Snapshot.current_step (IntegerField 0-9, default=0) - Create migration 0034_snapshot_current_step.py - Fix uuid_compat imports in migrations 0032 and 0003 ## Core Logic - Add extract_step(hook_name) utility - extracts step from __XX_ pattern - Add is_background_hook(hook_name) utility - checks for .bg. suffix - Update Snapshot.create_pending_archiveresults() to create one AR per hook - Update ArchiveResult.run() to handle hook_name field - Add Snapshot.advance_step_if_ready() method for step advancement - Integrate with SnapshotMachine.is_finished() to call advance_step_if_ready() ## Worker Coordination - Update ArchiveResultWorker.get_queue() for step-based filtering - ARs are only claimable when their step <= snapshot.current_step ## Hook Renumbering - Step 5 (DOM extraction): singlefile→50, screenshot→51, pdf→52, dom→53, title→54, readability→55, headers→55, mercury→56, htmltotext→57 - Step 6 (post-DOM): wget→61, git→62, media→63.bg, gallerydl→64.bg, forumdl→65.bg, papersdl→66.bg - Step 7 (URL extraction): parse_* hooks moved to 70-75 Background hooks (.bg suffix) don't block step advancement, enabling long-running downloads to continue while other hooks proceed.