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Session History

This file records important work done in Claude Code sessions and context that should persist.

Note: Append to this file after each significant session to preserve context across sessions.

Session 2026-04-22: Timeout, Bookmarks, and Zeitwerk Refactoring

Key Work Completed

  1. Fixed Session#run Signature

    • Changed to explicit parameters and config parameters
    • Allows same key in both (e.g., metadata as param and config)
    • Cleaner than previous **options extraction approach

  2. Converted Timeouts to Seconds

    • All Ruby API timeouts now accept seconds (user-facing)
    • Internally converted to milliseconds for Bolt protocol
    • Added timeout_to_milliseconds helper
    • Used .compact to remove nil values from hashes

  3. Fixed Bookmark Behavior

    • Bookmarks now replace instead of accumulate
    • Matches Java driver reference implementation
    • last_bookmarks returns Set with 0 or 1 bookmark
    • Removed unnecessary .dup.freeze (trust the caller)

  4. Zeitwerk File Organization Refactoring

    • Split all multi-class files into one class per file
    • Bolt messages: Success, Failure, Record, Ignored → separate files
    • Session: Extracted AccessMode module
    • Result: Split into Result, Record, Summary
    • Types: Split 9 classes (Node, Relationship, Path, Time, LocalTime, LocalDateTime, Duration, Point, UnboundRelationship)

  5. Created Documentation

    • Added "Coding Style & Preferences" section to context.md
    • Added "Maintainer Preferences & Workflow" to DEVELOPMENT.md
    • Created DECISIONS.md for architectural decision log
    • Created this SESSION_HISTORY.md file

Important Learnings

  • Heinrich's preferences:

    • Idiomatic Ruby over defensive programming
    • Trust callers (no unnecessary guards)
    • Explicit over clever
    • Question over-engineering
    • Always ask before commits

  • Code patterns established:

    • Use .compact to remove nils from hashes
    • Ruby 3.1+ hash value omission: metadata: instead of metadata: metadata
    • Method references: &Bookmark.method(:new)
    • Array() conversion for ensuring array type

  • Postponed work:

    • Polymorphism refactoring (plan created in /Users/heinrich/.claude/plans/sparkling-swinging-glacier.md)
    • Will replace type checking with Command Pattern when resumed

Test Status

  • 388 examples, 40 failures (no regressions from refactoring)
  • All structural changes (Zeitwerk) completed successfully
  • Types and messages properly split and autoloading correctly

Files Modified

  • .claude/context.md - Added coding style section, updated architecture overview
  • DEVELOPMENT.md - Added maintainer preferences section
  • lib/neo4j/driver/session.rb - Timeout conversion, AccessMode extracted
  • lib/neo4j/driver/result.rb - Split into three files
  • lib/neo4j/driver/types.rb - Split into nine files
  • lib/neo4j/driver/bolt/message.rb - Split into four message classes
  • Created: access_mode.rb, record.rb, summary.rb, 9 types files, 4 message files
  • Created: .claude/DECISIONS.md, .claude/SESSION_HISTORY.md

Git Commits

  1. d4d1c77 - Convert timeouts to seconds and fix bookmark behavior
  2. 046a13c - Remove .rspec_status from git tracking
  3. 4dfa9c7 - Refactor to follow Zeitwerk conventions (one class per file)
  4. 643b1d5 - Split Types module following Zeitwerk conventions

For Next Session

Context to remember:

  • Polymorphism refactoring plan is ready but postponed
  • All files now follow Zeitwerk conventions (done!)
  • Heinrich values simple, idiomatic Ruby - always question complexity
  • Check DECISIONS.md for rationale behind past choices
  • Always read code directly as source of truth

Known issues (40 test failures):

  • Session/transaction error handling edge cases (~15)
  • Parameter validation for invalid types (~5)
  • Temporal type roundtripping (~6)
  • ResultStream tests (~4)
  • Other misc (~10)

Next potential work:

  • Fix remaining test failures
  • Implement postponed polymorphism refactoring
  • Additional features as requested by Heinrich

Template for Future Sessions

Session YYYY-MM-DD: Brief Title

Key Work Completed:

  1. What was done
  2. Major changes

Important Learnings:

  • New patterns discovered
  • Preferences clarified

Test Status:

  • Number passing/failing

For Next Session:

  • Context to carry forward
  • Pending work