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Lifecycle Manager
Replace ad-hoc lifespan in main.py:
- Service registry: each component registers its start/stop/hooks
- Dependency resolution: model server starts before inference provider
- ...
infra:lifecycle-manager
Data Repository
Unify how sessions, datasets, knowledge, and feedback are stored:
- Repository pattern: SessionRepository, DatasetRepository, KnowledgeRepository
- Common interface: get(), list(), ...
infra:data-repository
Error Taxonomy
Replace except Exception: logger.warning everywhere:
- RecoverableError (retryable, transient)
- FatalError (non-recoverable, abort)
- ValidationError (bad input, return 400)
- ...
infra:error-taxonomy
Event Bus
Decouple components that currently talk via direct function calls:
- Model loaded → notify providers, update health, emit SSE
- Feedback recorded → trigger aggregation, update trait config ...
infra:event-bus
Rate Limiter
More granular than the current Semaphore(1):
- Per-endpoint limits (e.g., 10 req/s for /health)
- Per-user limits (e.g., 3 concurrent chat sessions)
- Per-model limits (e.g., 1 inference ...
infra:rate-limiter
Config System
Replace scattered os.getenv calls with a unified config:
- Schema-driven config classes (pydantic)
- File-based defaults (config/defaults.yaml)
- Environment variable overrides (APP_MODEL_NAME) ...
infra:config-system
Issue Description
The original repo of Lens has been deleted. Mirrors exist, for example this:
https://huggingface.co/Jinstudio/Lens-Turbo https://huggingface.co/Jinstudio/Lens-Base
https://huggingface.co/Jinstudio/Lens ...
Problem / Context
replaced_by succession is stored in five grain-specific tables (register / variant / variable / representation /
classification *_replaced_by). The cycle-acyclicity check is now two ...
enhancement
priority:low
reg_meta_build
Checklist
- [x] I m reporting a bug unrelated to a specific site
- [x] I ve verified that I have updated yt-dlp to nightly or master (update instructions)
- [x] I ve searched known issues, the FAQ, ...
bug
triage
Problem / Context
representation_replaced_by (the #843 representation-grain succession table, extended in #846 with an optional variant
scope) is currently write-only — no reg_meta query surface or webapp ...
cross-package
enhancement

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