Dependencies / Entanglement

The entangled core, precisely

Every system is partitioned by how many binding mechanisms apply: a pinning dependency, a WCF surface, or a shared core database. The partition is computed by rule from the current dataset, so it stays correct on every assessment run (counts can differ slightly from the whitepaper narrative, which was derived by hand). The binding runs through ten points; cutting those releases whole populations at once.

kernel The kernel: 67 systems bound by two or more mechanisms

The entangled core properly so called. These systems cannot be modernised one ticket at a time; they move as groups, sequenced by the programme stages.

loosely attached The loosely attached ring: 59 systems held by a single thread

Each of these touches exactly one binding mechanism, and each thread has a known cut. Most fall out of the core automatically when stage 2 cuts the binding points.

admin-studio (wcf)backoffice-address-lookup-service (wcf)backoffice-balanceduedate-api (wcf)backoffice-bt-credit-check (wcf)backoffice-customerrelations-ui (wcf)backoffice-documentation-booking (wcf)backoffice-documentation-ews (wcf)backoffice-eventlog (core db)backoffice-ledger-service (wcf)backoffice-useraccount-legacy (wcf)backoffice-useraccount-service (wcf)booking-download (wcf)company-info-api (wcf)cost-savings-api (wcf)direct-stock (wcf)intranet (core db)job-close-bookings (wcf)job-commission-set-payable (wcf)job-pending-receipts (wcf)job-revenue-recognition-component (wcf)job-update-credit-limit (wcf)mytc-datacleanup (wcf)mytc-payments (pinned)phenix-backoffice-integration-api (wcf)phenix-carhire (wcf)phenix-contact-centre-api (core db)phenix-currency (wcf)phenix-dashboard-api (pinned)phenix-database (core db)phenix-destination-management (wcf)phenix-destination-search (core db)phenix-insurance (pinned)phenix-packagevalidation-api (wcf)phenix-postbookingactivities (pinned)phenix-provider (core db)phenix-retail-configuration-service (wcf)phenix-service-management (wcf)phenix-thememanager (wcf)phenix-travelprotection-api (pinned)phenix-user-api (core db)provider-activator (core db)provider-transaction-reader (wcf)reconsent-api (wcf)service-fee-api (pinned)task-trigger-service (pinned)tc-connectionbroker (wcf)tc-document-platform (pinned)tc-gold-api (wcf)tc-passport-expiration-service (wcf)tc-phenix-dynamicmargin (pinned)tc-public-quote-sync-service (wcf)tc-referrals (pinned)tc-score (core db)tc-travelcounellors-sync-service (pinned)to-dyn365-api (wcf)travelcounsellors-net (pinned)useraccount-api (pinned)vccprovider-wex (pinned)webapi-exceptions (core db)

loose Already loose: 87 systems

No binding mechanisms apply. Modern leaf systems here are in effect already split out; legacy leaf systems split out by retirement rather than migration.

admin-studio-api advent-challenger asset-management aws-ui-ssm-access-lambda backoffice-commissions-service backoffice-pushnotifications-api booking-data-exporter booking-tags-api cache-management-api commission-statements-api crm-reporting-api custom-data-fields-api cybersource-api-integration db-intranet-mis html2pdf-service ibs-errata-api job-ledger-export kafka-consumer lib-repository maintainancetools-base-fault-handling-jobs payment-check-service payment-components payment-components-v1 paymentprovider-br-dge paymentprovider-dummy paymentprovider-pcipal paymentprovider-stripe payments-portal phenix-booking-commission-rate-api phenix-cart-api phenix-connectionbroker-api phenix-content-ui-web phenix-dashboard-task phenix-honeymoon-api phenix-itineraries phenix-locationservice-api phenix-provider-databases phenix-reasonstocall-api phenix-retail-api phenix-root-aws phenix-ui phenix-vcc phenix-xml-helpers reconsent-ui tc-actions-api tc-api-gateway tc-api-tools tc-auction tc-audited-db-context tc-communications tc-copilot tc-copilot-document-analyser tc-diagnostics-portal tc-exceptions tc-features tc-mail-composer tc-mail-orchestrator tc-mail-scheduler tc-mail-sender tc-mail-tracked tc-match tc-ml-margin tc-payment-router tc-performance tc-permissions-api tc-phenix-cancellation tc-profiles-api tc-public-assets-api tc-public-content-api tc-public-features tc-public-features-ui tc-public-quote-api tc-public-reviews-api tc-public-travelcounsellors tc-redis-cache-event-socket-server tc-redis-cache-event-viewer tc-reviews-sync-service tc-streams-masstransit-adapter tc-swagger-versioning tc-useraccount-telephonecontracts-api tc-useraccount-telephonecontracts-servicecontract TC.PublicWebsites.EmailQueue trainline-api trustpayments-api-integration ttand-database vccprovider-conferma viewing-as-api