feat: six adapter

[cll-dawid]

Closes CM-1575

Description

New External Adapter for SIX Exchange and BME equity market data. Connects to SIX Web API via GraphQL subscriptions over WebSocket with mTLS certificate authentication. Streams real-time price data (last, bid, ask, mid, volume) for Swiss (SMI) and Spanish (IBEX) equities.

Supports the Chainlink DataLink pilot with SIX Exchange and BME, initially covering 4 instruments (ABBN, ALC on SIX Swiss Exchange; ANA, ANE on BME), scaling to 57.

Changes

• New source adapter @chainlink/six-adapter using V3 framework (WebSocketTransport)
• mTLS authentication via Base64-encoded cert/key environment variables (CERT_BASE64, KEY_BASE64)
• GraphQL subscription queries with configurable conflation period (CONFLATION_PERIOD, default PT1S)
• Ripcord mechanism: triggers 502 on SIX stream errors (entitlement failures, invalid instruments) and stale data (>5 min old)
• Reconnect tuning: WS_SUBSCRIPTION_UNRESPONSIVE_TTL set to 30s (SIX disconnects after 60s inactivity)
• Unit tests for query builders and timestamp conversion
• Integration tests with mocked WebSocket: success flow, ripcord on entitlement error, ripcord on stale data, alias parameter resolution

Steps to Test

1. Build: cd packages/sources/six && yarn build
2. Unit tests: yarn jest packages/sources/six/test/unit
3. Integration tests: yarn jest packages/sources/six/test/integration
4. Live test (requires SIX mTLS certificate with REAL_TIME entitlements):

   cd packages/sources/six
   CERT_BASE64=$(base64 < /path/to/signed-certificate.pem) \
   KEY_BASE64=$(base64 < /path/to/private-key.pem) \
   yarn start

   curl -X POST http://localhost:8080 \
     -H 'Content-Type: application/json' \
     -d '{"data":{"ticker":"ANA","bc":"1058"}}'

Quality Assurance

• If a new adapter was made, or an existing one was modified so that its environment variables have changed, update the relevant infra-k8s configuration file.
• If a new adapter was made, or an existing one was modified so that its environment variables have changed, update the relevant adapter-secrets configuration file.
• If a new adapter was made, or a new endpoint was added, update the test-payload.json file with relevant requests.
• The branch naming follows git flow (feature/x, chore/x, release/x, hotfix/x, fix/x) or is created from Jira.
• This is related to a maximum of one Jira story or GitHub issue.
• Types are safe (avoid TypeScript/TSLint features like any and disable, instead use more specific types).
• All code changes have 100% unit and integration test coverage. If testing is not applicable or too difficult to justify doing, the reasoning should be documented explicitly in the PR.

[changeset-bot]

🦋 Changeset detected

Latest commit: 42522c5

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@chainlink/six-adapter	Major

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