yellowjacket/.planning/phases/11-per-library-scan-pipeline/11-03-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, requirements-completed, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	requirements-completed	duration	completed
11-per-library-scan-pipeline	03	library	scan-pipeline startup auto-scan legacy-cleanup	phase provides 11-per-library-scan-pipeline ScanLibrary, ScanAllLibraries, scanInternal, scan queue coordinator	Auto-scan all libraries on app launch via ScanAllLibraries in OnDomReady FullRescan using DB-sourced library (not config DirectoryPath) Cleaned-up Library with no legacy single-directory handler	12-library-crud-data-integrity	added patterns Auto-scan goroutine in OnDomReady — non-blocking startup scan FullRescan resolves library from DB via GetAllLibraries	created modified backend/app.go backend/library/library.go backend/library/rescan.go	FullRescan uses first library from GetAllLibraries — per-library rescan deferred to Phase 12 LibraryConfigChanged handler removed entirely rather than updated — multi-library model uses CRUD API Scan() wrapper deleted — only callers were handleConfigUpdate and FullRescan, both updated	Auto-scan pattern: goroutine in OnDomReady calling ScanAllLibraries	LSCAN-01 LSCAN-02	10min	2026-03-09

Phase 11 Plan 03: Wire Auto-Scan and Clean Up Legacy Code Summary

Auto-scan all libraries on app launch via ScanAllLibraries goroutine, FullRescan from DB-sourced library, legacy single-directory handlers removed

Performance

• Duration: 10 min
• Started: 2026-03-09T20:07:03Z
• Completed: 2026-03-09T20:17:10Z
• Tasks: 1
• Files modified: 3

Accomplishments

• Auto-scan on startup calls ScanAllLibraries() in a goroutine from OnDomReady — same codepath as UI button
• Legacy LibraryConfigChanged event handler removed from registerEventHandlers
• Legacy handleConfigUpdate method deleted (single-directory model)
• Deprecated Scan() wrapper deleted (replaced by ScanLibrary/ScanAllLibraries)
• errLibraryDirNotConfigured sentinel error removed
• FullRescan now resolves library from DB via GetAllLibraries instead of config DirectoryPath
• FullRescan calls scanInternal directly instead of the removed Scan() wrapper

Task Commits

Each task was committed atomically:

1. Task 1: Wire auto-scan on startup and clean up legacy single-directory code - 1aaf536 (feat)

Note: Code changes were included in the 11-02 metadata commit due to staging overlap. All changes are verified present and correct.

Files Created/Modified

• backend/app.go - Added ScanAllLibraries goroutine in OnDomReady, added early return after startupErr
• backend/library/library.go - Removed LibraryConfigChanged handler, handleConfigUpdate, Scan(), errLibraryDirNotConfigured; updated NewLibrary doc comment
• backend/library/rescan.go - FullRescan resolves first library from DB, calls scanInternal directly, added errNoLibrariesConfigured sentinel

Decisions Made

• FullRescan uses first library from DB: Per-library full rescan will be added in Phase 12. For now, FullRescan() takes the first library from GetAllLibraries() — this preserves backward compatibility for the config-page "Rescan" button in the single-library case.
• Complete removal of LibraryConfigChanged handler: Rather than updating the handler for multi-library, it was removed entirely. In the multi-library model, libraries are managed through the CRUD API (Phase 12) and scanning is triggered explicitly via ScanLibrary/ScanAllLibraries.
• Scan() wrapper deleted: The only callers were handleConfigUpdate (deleted) and FullRescan (updated to use scanInternal directly). No backward-compatible wrapper needed.

Deviations from Plan

Auto-fixed Issues

1. [Rule 3 - Blocking] Fixed golangci-lint wsl and err113 violations

• Found during: Task 1 (commit attempt)
• Issue: Pre-commit hook flagged: (1) wsl — block ending with comment in registerEventHandlers, (2) err113 — dynamic errors.New in rescan.go
• Fix: (1) Moved comment to function doc comment, removed empty return before close brace. (2) Created static errNoLibrariesConfigured sentinel error variable.
• Files modified: backend/library/library.go, backend/library/rescan.go
• Verification: golangci-lint passes with 0 issues
• Committed in: 1aaf536 (part of task commit)

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Total deviations: 1 auto-fixed (blocking — lint compliance) Impact on plan: Necessary for pre-commit hook compliance. No scope creep.

Issues Encountered

None

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• Phase 11 complete — all 3 plans executed
• Per-library scan pipeline fully wired: ScanLibrary(id), ScanAllLibraries(), auto-scan on launch
• Ready for Phase 12: Library CRUD & Data Integrity
• Frontend already has per-library progress display and queue-aware cancel dialog (Plan 02)
• Phase 12 can build library management UI (add/rename/remove) on top of existing scan infrastructure

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Phase: 11-per-library-scan-pipeline Completed: 2026-03-09