docs: add worklog for worker CLI cleanup session
Documents exit code fixes, P3/P4 refactors, and tech debt resolution. 10 commits, 13 files, +980/-241 lines, 56/56 tests passing. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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docs/worklogs/2026-01-11-worker-cli-cleanup-refactors.org
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#+TITLE: Worker CLI Cleanup: Exit Codes, Refactors, and Tech Debt Resolution
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#+DATE: 2026-01-11
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#+KEYWORDS: worker-cli, nim, refactoring, exit-codes, sqlite, state-machine, testing
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#+COMMITS: 10
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#+COMPRESSION_STATUS: uncompressed
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* Session Summary
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** Date: 2026-01-11 (Day 2 of worker CLI implementation)
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** Focus Area: Code quality cleanup and tech debt resolution for worker CLI
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This session continued from yesterday's multi-agent worker CLI implementation, focusing
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on fixing bugs discovered during testing, completing P3/P4 refactoring tasks, and
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ensuring all loose ends were tied up.
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* Accomplishments
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- [X] Fixed exit codes bug (skills-lxb9) - state transition errors now return code 3
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- [X] Fixed double ROLLBACK bug in state.nim transaction handling
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- [X] Extracted poll() null-check helper with generic optFromDb function
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- [X] Extracted rowToWorkerInfo helper to deduplicate getWorker/getAllWorkers
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- [X] Extracted loadContextFromPath helper to deduplicate context loading
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- [X] Created developer docs for compiling/deployment workflow
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- [X] Consolidated isStale/staleLevel into single computeStaleLevel with enum
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- [X] Refactored transition functions to use withTransaction template
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- [X] Added schema migration infrastructure for future DB changes
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- [X] Extracted renderStatusTable from nested proc in status()
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- [X] Added column width constants for status table
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- [X] Replaced case statement with parseEnum for heartbeat status
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- [X] Added return value to startGlobalHeartbeat for caller feedback
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- [X] Removed unused getBranchStatus function (dead code)
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- [X] Ran comprehensive integration testing throughout
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* Key Decisions
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** Decision 1: Use StaleLevel enum instead of string returns
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- Context: isStale() and staleLevel() had duplicated logic for computing staleness
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- Options considered:
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1. Keep separate functions with shared helper
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2. Create enum and single source of truth function
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- Rationale: Enum provides type safety, single computeStaleLevel is canonical
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- Impact: Cleaner API, easier to add new stale levels in future
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** Decision 2: Remove getBranchStatus rather than keep unused code
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- Context: Function existed but was never called anywhere
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- Options considered:
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1. Keep for potential future use
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2. Remove and restore from git history if needed
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- Rationale: Dead code creates maintenance burden; git preserves history
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- Impact: Smaller, cleaner codebase
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** Decision 3: Leave tryClaim with inline transaction handling
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- Context: tryClaim has different semantics (returns bool, doesn't raise)
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- Options considered:
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1. Create withTransactionOrFalse variant
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2. Leave as-is with inline handling
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- Rationale: Over-engineering for one function; semantics differ from withTransaction
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- Impact: Pragmatic choice, tryClaim remains readable
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* Problems & Solutions
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| Problem | Solution | Learning |
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|---------|----------|----------|
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| Double ROLLBACK causing "no transaction active" | Removed inline ROLLBACKs, let except block handle | Single rollback point prevents double-free pattern |
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| StaleState not caught, wrong exit code | Added except StaleState alongside InvalidTransition | Map all state errors to same exit code |
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| Tests failing with NOT_FOUND for DB queries | sqlite3 wasn't in PATH; set LD_LIBRARY_PATH and PATH | Test environment needs explicit sqlite setup |
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| parseEnum type not matching HeartbeatStatus | HeartbeatStatus enum values match string literals exactly | Nim parseEnum uses enum value strings |
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* Technical Details
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** Code Changes
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- Total files modified: 13
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- Key files changed:
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- =src/worker.nim= - Exit code handling, renderStatusTable extraction, parseEnum
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- =src/worker/state.nim= - withTransaction usage, StaleLevel enum, rowToWorkerInfo
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- =src/worker/db.nim= - Migration infrastructure, optFromDb in poll()
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- =src/worker/utils.nim= - optFromDb generic helper
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- =src/worker/context.nim= - loadContextFromPath extraction
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- =src/worker/heartbeat.nim= - startGlobalHeartbeat return value
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- =src/worker/git.nim= - Removed unused getBranchStatus
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- =src/worker/types.nim= - StaleLevel enum
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- New files created:
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- =docs/worker-cli-dev-guide.md= - Developer documentation
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** Commands Used
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#+begin_src bash
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# Compile worker
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nix-shell -p nim --run "nim c -d:release --mm:orc src/worker.nim"
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# Run tests with sqlite in environment
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bash -c 'export LD_LIBRARY_PATH=/nix/store/.../lib; \
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export PATH=$PATH:/nix/store/.../bin; \
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src/worker/tests/test-worker.sh'
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# Find sqlite library paths on NixOS
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find /nix/store -name "libsqlite3.so" | head -1
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find /nix/store -name "sqlite3" -type f | grep bin | head -1
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#+end_src
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** Architecture Notes
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- Transaction handling: Single withTransaction template with ROLLBACK in except block
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- State machine: Exceptions flow through, caller handles WorkerNotFound/StaleState/InvalidTransition
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- Schema migrations: Version-based, forward-only, runs automatically on DB open
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- Column constants: Centralized for consistent table formatting
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* Process and Workflow
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** What Worked Well
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- Incremental refactoring with test verification after each change
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- Using beads issues to track and close work systematically
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- Integration testing caught the double-ROLLBACK bug early
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- TodoWrite for tracking progress through multiple small tasks
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** What Was Challenging
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- Network down prevented pushing to remote throughout session
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- NixOS sqlite library path discovery requires manual lookup
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- Context recovery from session compaction required careful reading
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* Learning and Insights
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** Technical Insights
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- Nim's ORC handles ref types cleanly; no manual memory management needed
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- tiny_sqlite ResultRow works directly with openArray-like indexing
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- parseEnum is cleaner than case statements for string-to-enum conversion
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- withTransaction template elegantly handles BEGIN/COMMIT/ROLLBACK pattern
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** Process Insights
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- P4 tasks compound quickly; worth batching them together
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- Code review findings from previous session created useful task backlog
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- Comprehensive test suite catches regressions during refactoring
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** Architectural Insights
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- State machine exceptions should be unified at handler level (all -> exit code 3)
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- Schema migrations need to be idempotent and forward-only
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- Separating render logic from CLI dispatch improves testability
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* Context for Future Work
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** Open Questions
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- Should query procs move from state.nim to db.nim? (skills-8la4, P4)
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- Rollback strategy for failed workers needs design (skills-7n4, P3)
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- Git bundle checkpoints evaluation pending (skills-8ak, P3)
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** Next Steps
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- Push commits when network available
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- Design doc for rollback strategy
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- Consider multi-agent orchestration integration points
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** Related Work
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- [[file:2026-01-10-multi-agent-lego-architecture-design.org][Multi-Agent Lego Architecture Design]] - Previous session
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- =docs/adr/006-nim-worker-cli.md= - ADR for Nim language choice
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- =docs/worker-cli-dev-guide.md= - Developer documentation created this session
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* Raw Notes
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Session was continuation of worker CLI implementation. Primary focus shifted from
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feature development to code quality and bug fixes discovered during testing.
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The exit codes bug was interesting - the state machine was raising StaleState when
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current state didn't match expected state, but the CLI commands only caught
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InvalidTransition. This caused unhandled exception behavior with wrong exit codes.
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The double-ROLLBACK bug was subtle: transition() had inline ROLLBACKs before raising
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exceptions, then the except block tried to ROLLBACK again. SQLite correctly rejected
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the second ROLLBACK since there was no active transaction.
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Network was down throughout session (192.168.1.108:3000 unreachable), so all work
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is committed locally but not pushed. Will need to push when network recovers.
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* Session Metrics
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- Commits made: 10
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- Files touched: 13
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- Lines added/removed: +980/-241
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- Tests added: 0 (existing test suite used)
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- Tests passing: 56/56
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