---
phase: 13-registry-mode-enum
plan: 01
subsystem: registry
tags: [ouroboros, aion, symbol-registry, enum, validation]

requires:
  - phase: none
    provides: existing OuroborosMode enum and symbol registry

provides:
  - OuroborosMode.AION enum variant for continuous (no-reset) mode
  - ouroboros_mode field on every SymbolEntry (crypto=aion, forex=day)
  - crypto-only validation rejecting aion on non-crypto symbols
  - get_registered_symbols(ouroboros_mode=...) filter capability
  - PopulationConfig accepting Literal["day", "aion"]

affects: [sidecar, kintsugi, heartbeat, validation, day-mode-gate]

tech-stack:
  added: []
  patterns:
    - "OuroborosMode enum dispatch for boundary/segment functions"
    - "Crypto-only validation gate in registry parser"

key-files:
  created: []
  modified:
    - python/opendeviationbar/ouroboros.py
    - python/opendeviationbar/symbol_registry.py
    - python/opendeviationbar/data/symbols.toml
    - python/opendeviationbar/config/population.py
    - tests/test_ouroboros.py
    - tests/test_symbol_registry.py

key-decisions:
  - "AION returns empty boundaries list (no resets) and single full-range segment"
  - "Crypto-only validation enforced at registry parse time (fail-fast)"
  - "All 30 crypto symbols set to aion, all 10 forex symbols set to day"

patterns-established:
  - "OuroborosMode dispatch: check mode == 'aion' early-return pattern in boundary/segment functions"

requirements-completed: [REG-01, REG-02, REG-03, REG-05]

duration: 5min
completed: 2026-03-27
---

# Phase 13 Plan 01: Registry Mode Enum Summary

**OuroborosMode.AION enum variant with symbols.toml wiring, crypto-only validation, and boundary function dispatch**

## What Was Done

### Task 1: OuroborosMode.AION + Validation + PopulationConfig

- Added `AION = "aion"` variant to `OuroborosMode` enum with updated docstring
- Updated `validate_ouroboros_mode()` to accept both "day" and "aion" (set-based validation)
- Updated `get_ouroboros_boundaries()`: returns `[]` for aion mode (no reset boundaries)
- Updated `iter_ouroboros_segments()`: yields single full-range segment for aion mode
- Updated `get_operational_ouroboros_mode()` return type to `Literal["day", "aion"]`
- Expanded `PopulationConfig.ouroboros_mode` to `Literal["day", "aion"]`
- Added 5 new tests for AION variant, validation, boundaries, and segments
- **Commit:** 5559aa7

### Task 2: symbols.toml + SymbolEntry + Crypto-Only Validation

- Added `ouroboros_mode: OuroborosMode` field to `SymbolEntry` dataclass (default: DAY)
- Wired `ouroboros_mode` parsing in `get_symbol_entries()` with `OuroborosMode(raw_mode)` enum construction
- Added crypto-only validation: `ValueError` raised if aion set on non-crypto `asset_class`
- Added `ouroboros_mode = "aion"` to all 30 crypto symbols in `symbols.toml`
- Added `ouroboros_mode = "day"` to all 10 forex symbols in `symbols.toml`
- Added `ouroboros_mode: str | None` filter parameter to `get_registered_symbols()`
- Added 7 new tests for registry round-trip, mode assertions, and validation
- **Commit:** 8bd8a7c

## Deviations from Plan

None - plan executed exactly as written.

## Known Stubs

None - all functionality is fully wired.

## Verification

- 107 tests pass across `test_ouroboros.py` (50) and `test_symbol_registry.py` (57)
- Smoke tests: `OuroborosMode.AION.value == "aion"`, `validate_ouroboros_mode("aion") == "aion"`
- Registry round-trip: 40 symbols loaded, all crypto symbols have aion, all forex have day
- Import from package: `from opendeviationbar import OuroborosMode; OuroborosMode.AION` works

## Self-Check: PASSED
