[diegosouzapw]

Closes #10714

⚠️ base-red inherited: #9985

Root cause

getProviderMetrics() (src/lib/db/callLogStats.ts) aggregates /api/provider-metrics topology data directly from call_logs grouped by provider, with no filter against currently-live provider_connections. Deleting a provider connection (src/lib/db/providers/deletion.ts) never touches call_logs, so a deleted provider's historical rows keep feeding the Home "Provider Topology" widget forever — including a permanent stale "error" node if its last logged status was non-2xx.

Fix

Add AND EXISTS (SELECT 1 FROM provider_connections pc WHERE pc.provider = c.provider) to the getProviderMetrics() query, so only providers with a live connection row surface in topology/metrics. Read-only aggregation query change; sole caller is /api/provider-metrics (the similarly-named MCP handleGetProviderMetrics is an unrelated function hitting different endpoints).

Regression test (TDD, Hard Rule #18)

tests/unit/provider-metrics-deleted-provider.test.ts — seeds a live openai connection + call log, and a g4f-pollinations call log with no matching provider_connections row (simulating a deleted provider). Asserts the deleted provider never appears in topology.providers, metrics, or topology.errorProvider, while the live provider still does.

• RED (pre-fix): AssertionError: deleted provider must not appear in topology.providers — true !== false
• GREEN (post-fix): tests 1, pass 1, fail 0

Also updated fixtures in the two existing suites that exercise this query (tests/unit/provider-metrics-route.test.ts, tests/unit/db-call-log-stats-3500.test.ts) to seed provider_connections rows for the providers they assert on — required setup under the new filter, not a weakened assertion.

node --import tsx/esm --test tests/unit/provider-metrics-route.test.ts tests/unit/db-call-log-stats-3500.test.ts tests/unit/provider-metrics-deleted-provider.test.ts
→ tests 10, pass 10, fail 0

Gates run (all clean on touched files)

• node scripts/check/check-file-size.mjs — OK
• node scripts/check/check-complexity.mjs — OK (2546 violations vs baseline 2774)
• node scripts/check/check-cognitive-complexity.mjs — OK (1144 violations vs baseline 1223)
• node scripts/check/check-changelog-integrity.mjs — OK
• npx eslint --suppressions-location config/quality/eslint-suppressions.json <touched files> — clean
• npm run typecheck:core — exit 0