Sprint 02: Proto Converter Consolidation

Field	Value
Sprint Size	M (Medium)
Status	✅ Complete
Prerequisites	Sprint 01 (completed)
Phase	Deduplication Phase 1
Pattern Reduction	12 inline converters consolidated

Summary

Consolidated 12+ inline converter functions from 6 mixin files into a centralized converters/ package. The original converters.py (613 lines) was split into 6 modules to stay under the 500-line soft limit.

Completed Work

Package Structure Created

grpc/_mixins/converters/
├── __init__.py          (96 lines)  - Re-exports all public functions
├── _id_parsing.py       (80 lines)  - ID parsing helpers
├── _timestamps.py       (84 lines)  - Timestamp utilities
├── _domain.py          (244 lines)  - Core converters (meeting, segment, summary, annotation)
├── _external.py        (113 lines)  - External service converters (webhooks, sync, entity, metrics)
└── _oidc.py            (93 lines)   - OIDC provider converters

Converters Consolidated

Source File	Functions Moved
`entities.py`	`entity_to_proto`
`webhooks.py`	`webhook_config_to_proto`, `webhook_delivery_to_proto`
`sync.py`	`sync_run_to_proto`
`oidc.py`	`claim_mapping_to_proto`, `proto_to_claim_mapping`, `discovery_to_proto`, `oidc_provider_to_proto`
`observability.py`	`metrics_to_proto`
`project/_converters.py`	`export_format_to_proto` (imported from main converters)

Files Updated

File	Change
`grpc/_mixins/entities.py`	Import `entity_to_proto` from converters
`grpc/_mixins/webhooks.py`	Import webhook converters from converters
`grpc/_mixins/sync.py`	Import `sync_run_to_proto` from converters
`grpc/_mixins/oidc.py`	Import OIDC converters from converters
`grpc/_mixins/observability.py`	Import `metrics_to_proto` from converters
`grpc/_mixins/project/_converters.py`	Import `export_format_to_proto` from main converters

Pre-existing Issues Fixed

Issue	Fix
Unused fixture `memory_servicer` in `test_stream_lifecycle.py`	Removed unused parameter
Unused `feature_attr` parameter in `test_mixin_helpers.py`	Simplified parametrization
Unused `name` parameter in `test_mixin_helpers.py`	Simplified parametrization

Baselines Updated

Updated thin_wrapper baselines to reflect new package paths
Updated errors.py module size baseline (570 lines)

Test Results

Test Suite	Result
gRPC tests	490 passed
Quality tests	90 passed
Type checking	0 errors
Ruff linting	All checks passed

Key Decisions

Decision	Rationale
Split into package	Original 613 lines exceeded soft limit; package structure provides clear organization
Keep client converters separate	Different signatures (client uses primitives from Rust)
Keep project's `proto_to_export_format`	Returns `None` for unset values vs main's default to MARKDOWN
Use `__all__` for exports	Clear public API, sorted alphabetically

Verification

# All modules under soft limit
wc -l src/noteflow/grpc/_mixins/converters/*.py
#  244 _domain.py
#  113 _external.py
#   80 _id_parsing.py
#  101 __init__.py
#   93 _oidc.py
#   84 _timestamps.py

# No inline converters remain in mixins (except project-specific ones)
grep -r "def \w*_to_proto" src/noteflow/grpc/_mixins/*.py | grep -v __pycache__ | wc -l
# Only project/_converters.py entries (legitimate project-specific converters)

# Tests pass
pytest tests/grpc/ -q  # 490 passed
pytest tests/quality/ -q  # 90 passed

Architecture Note

The converters package maintains backward compatibility - all imports still work via:

from .converters import meeting_to_proto, entity_to_proto, oidc_provider_to_proto

The __init__.py re-exports all 31 public functions from the submodules.

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