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egg cbb943dfe5 feat(trace-pool-isolation): migrate event_fetcher/lineage_engine to slow connections + fix 51 test failures

Trace pipeline pool isolation:
- Switch event_fetcher and lineage_engine to read_sql_df_slow (non-pooled)
- Reduce EVENT_FETCHER_MAX_WORKERS 4→2, TRACE_EVENTS_MAX_WORKERS 4→2
- Add 60s timeout per batch query, cache skip for CID>10K
- Early del raw_domain_results + gc.collect() for large queries
- Increase DB_SLOW_MAX_CONCURRENT: base 3→5, dev 2→3, prod 3→5

Test fixes (51 pre-existing failures → 0):
- reject_history: WORKFLOW CSV header, strict bool validation, pareto mock path
- portal shell: remove non-existent /tmtt-defect route from tests
- conftest: add --run-stress option to skip stress/load tests by default
- migration tests: skipif baseline directory missing
- performance test: update Vite asset assertion
- wip hold: add firstname/waferdesc mock params
- template integration: add /reject-history canonical route

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-02-25 16:13:19 +08:00

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event-fetcher-unified Specification

Purpose

TBD - created by archiving change unified-lineage-engine. Update Purpose after archive.

Requirements

Requirement: EventFetcher SHALL provide unified cached event querying across domains

EventFetcher SHALL encapsulate batch event queries with L1/L2 layered cache and rate limit bucket configuration, supporting domains: history, materials, rejects, holds, jobs, upstream_history, downstream_rejects.

Scenario: Cache miss for event domain query

WHEN EventFetcher is called for a domain with container IDs and no cache exists
THEN the domain query SHALL execute against Oracle via read_sql_df_slow() (non-pooled dedicated connection)
THEN each batch query SHALL use timeout_seconds=60
THEN the result SHALL be stored in L2 Redis cache with key format evt:{domain}:{sorted_cids_hash} if CID count is within cache threshold
THEN L1 memory cache SHALL also be populated if CID count is within cache threshold

Scenario: Cache hit for event domain query

WHEN EventFetcher is called for a domain and L2 Redis cache contains a valid entry
THEN the cached result SHALL be returned without executing Oracle query
THEN DB connection pool SHALL NOT be consumed

Scenario: Rate limit bucket per domain

WHEN EventFetcher is used from a route handler
THEN each domain SHALL have a configurable rate limit bucket aligned with configured_rate_limit() pattern
THEN rate limit configuration SHALL be overridable via environment variables

Scenario: Large CID set exceeds cache threshold

WHEN the normalized CID count exceeds CACHE_SKIP_CID_THRESHOLD (default 10000, env: EVENT_FETCHER_CACHE_SKIP_CID_THRESHOLD)
THEN EventFetcher SHALL skip both L1 and L2 cache writes
THEN a warning log SHALL be emitted with domain name, CID count, and threshold value
THEN the query result SHALL still be returned to the caller

Scenario: Batch concurrency default

WHEN EventFetcher processes batches for a domain with >1000 CIDs
THEN the default EVENT_FETCHER_MAX_WORKERS SHALL be 2 (env: EVENT_FETCHER_MAX_WORKERS)

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