---
phase: 43-metadata-foundation
plan: 01
subsystem: model
tags: [serde, backward-compat, access-modifier, metadata]

# Dependency graph
requires: []
provides:
  - AccessModifier enum (Public/Private) for facts and metrics
  - comment, synonyms fields on all 5 model structs
  - access field on Metric and Fact
  - Backward-compatible serde deserialization for pre-v0.6.0 JSON
affects: [43-02 parser, 44 expansion, 45 introspection]

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "AccessModifier enum with is_default() for serde skip_serializing_if"
    - "Metadata fields (comment/synonyms/access) on all semantic model structs"

key-files:
  created: []
  modified:
    - src/model.rs
    - src/body_parser.rs
    - src/parse.rs
    - src/expand/sql_gen.rs
    - src/expand/test_helpers.rs
    - src/graph/test_helpers.rs
    - src/graph/relationship.rs
    - tests/expand_proptest.rs

key-decisions:
  - "AccessModifier follows Cardinality enum pattern: Default derive, is_default() method, skip_serializing_if"
  - "All struct literal constructions updated with explicit field values (not ..Default::default()) to match existing codebase style"

patterns-established:
  - "AccessModifier::is_default pattern for serde skip: matches!(self, Self::Public)"
  - "Metadata fields always use #[serde(default, skip_serializing_if)] for backward compat"

requirements-completed: [META-01, META-06, META-07]

# Metrics
duration: 64min
completed: 2026-04-10
---

# Phase 43 Plan 01: Metadata Foundation Summary

**AccessModifier enum (Public/Private) and metadata fields (comment, synonyms, access) on all 5 model structs with backward-compatible serde**

## Performance

- **Duration:** 64 min
- **Started:** 2026-04-10T06:59:31Z
- **Completed:** 2026-04-10T08:03:35Z
- **Tasks:** 1
- **Files modified:** 8

## Accomplishments
- Added AccessModifier enum with Public (default) and Private variants, following Cardinality pattern
- Added comment (Option<String>) and synonyms (Vec<String>) to TableRef, Dimension, Metric, Fact
- Added access (AccessModifier) to Metric and Fact for PUBLIC/PRIVATE visibility control
- Added view-level comment (Option<String>) to SemanticViewDefinition
- All new fields use #[serde(default)] and skip_serializing_if for backward compatibility
- Pre-v0.6.0 JSON without any new fields deserializes with correct defaults
- 9 new tests covering backward compat, roundtrip, skip_serializing, and AccessModifier logic
- Updated all struct literal constructions across 8 files (body_parser, parse, test helpers, proptest)

## Task Commits

Each task was committed atomically:

1. **Task 1: Add AccessModifier enum and metadata fields to all model structs** - `e3de1e9` (feat)

## Files Created/Modified
- `src/model.rs` - AccessModifier enum, metadata fields on all 5 structs, 9 new tests
- `src/body_parser.rs` - Updated Fact/Dimension/Metric/TableRef struct literals with new fields, added AccessModifier import
- `src/parse.rs` - Updated SemanticViewDefinition and TableRef struct literals with new fields
- `src/expand/sql_gen.rs` - Updated all test struct literals (57 AccessModifier refs), added imports to 7 test modules
- `src/expand/test_helpers.rs` - Updated orders_view(), minimal_def(), TestFixtureExt methods with new fields
- `src/graph/test_helpers.rs` - Updated make_def(), make_def_with_facts(), make_def_with_derived_metrics(), make_def_with_named_joins()
- `src/graph/relationship.rs` - Updated all TableRef and SemanticViewDefinition test struct literals
- `tests/expand_proptest.rs` - Updated simple_definition() and joined_definition() with new fields

## Decisions Made
- AccessModifier follows established Cardinality pattern: `#[derive(Default)]` with `#[default] Public`, `is_default()` method used by `skip_serializing_if`
- All struct literal constructions updated with explicit field values to match existing codebase convention (most tests spell out all fields rather than using `..Default::default()`)

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Fixed struct literal constructions across entire codebase**
- **Found during:** Task 1
- **Issue:** Plan listed specific files (body_parser.rs, parse.rs) for struct literal updates, but 135+ additional struct literals existed in test files (expand/sql_gen.rs, graph/relationship.rs, graph/test_helpers.rs, expand/test_helpers.rs, tests/expand_proptest.rs)
- **Fix:** Updated all struct literal constructions with new field values and added AccessModifier imports to all affected test modules
- **Files modified:** 6 additional files beyond what plan specified
- **Verification:** `cargo check --tests` and `cargo test` pass with 496 tests
- **Committed in:** e3de1e9

---

**Total deviations:** 1 auto-fixed (1 blocking - additional files needed updating)
**Impact on plan:** Necessary for compilation. No scope creep.

## Issues Encountered
- Automated script to add fields accidentally inserted bare field values into the Metric struct definition (not a struct literal) in model.rs. Caught immediately by compilation error and fixed manually.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness
- Model fields are ready for Plan 02 (parser) to populate comment/synonyms/access from DDL syntax
- All existing tests pass -- no behavioral regression
- AccessModifier::Public is the default for all existing definitions (backward compatible)

## Self-Check: PASSED

- All 8 modified files exist on disk
- Task commit e3de1e9 exists in git log
- SUMMARY.md created at expected path
- AccessModifier enum with is_default() verified in model.rs
- comment, synonyms, access fields verified in model.rs
- cargo test: 496 tests pass (0 failures)

---
*Phase: 43-metadata-foundation*
*Completed: 2026-04-10*
