---
phase: quick
plan: 17
subsystem: docs
tags: [readme, documentation, v0.5.3]

requires:
  - phase: 29-32
    provides: all v0.5.3 features (FACTS, hierarchies, derived metrics, cardinality, fan traps, role-playing USING)
provides:
  - updated README.md documenting v0.5.3 feature set
affects: []

tech-stack:
  added: []
  patterns: []

key-files:
  created: []
  modified: [README.md]

key-decisions:
  - "Matched existing README tone: brief intro + small SQL snippet per feature"
  - "DDL reference shows full clause order (TABLES, RELATIONSHIPS, FACTS, HIERARCHIES, DIMENSIONS, METRICS)"

patterns-established: []

requirements-completed: [FACT-01, FACT-05, HIER-01, HIER-03, DRV-01, FAN-01, FAN-02, JOIN-02, ROLE-01]

duration: 1min
completed: 2026-03-15
---

# Quick Task 17: Update README.md with v0.5.3 Features Summary

**README updated with 5 new feature sections (FACTS, derived metrics, hierarchies, cardinality/fan traps, role-playing USING) and bumped version to v0.5.3**

## Performance

- **Duration:** 1 min
- **Started:** 2026-03-15T08:19:20Z
- **Completed:** 2026-03-15T08:20:30Z
- **Tasks:** 1
- **Files modified:** 1

## Accomplishments
- Bumped version line from v0.5.2 to v0.5.3
- Added FACTS section with chained fact example and inline explanation
- Added derived metrics section showing metric composition syntax
- Added hierarchies section documenting drill-down metadata
- Added cardinality and fan trap detection section with supported annotations
- Added role-playing dimensions section with flights/airports USING example
- Updated DDL reference to show full clause order including FACTS and HIERARCHIES

## Task Commits

Each task was committed atomically:

1. **Task 1: Update README.md with v0.5.3 feature sections** - `c07505a` (docs)

## Files Created/Modified
- `README.md` - Updated from 171 to 264 lines with v0.5.3 feature documentation

## Decisions Made
- Matched existing README tone: brief intro paragraph + small SQL snippet per feature section
- DDL reference shows full clause order rather than ellipsis, with note that FACTS and HIERARCHIES are optional

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered
None

## User Setup Required
None - no external service configuration required.

## Next Phase Readiness
- README is current with all v0.5.3 features
- Ready for milestone merge and tagging

## Self-Check: PASSED

- README.md: FOUND
- 17-SUMMARY.md: FOUND
- Commit c07505a: FOUND

---
*Quick Task: 17*
*Completed: 2026-03-15*
