Legacy Application Retirement Engineering Lab

Legacy Application Retirement Overview

LAR_DEMO / Portfolio / Retirement Workspace

Vendor-neutral retirement workspace. Govern the complete application-retirement lifecycle: inventory, dependency closure, data preservation, retention, validation, controlled shutdown, evidence and final closure.

Applications Assessed124 retirement candidates

Dependencies173 require closure

Archive Coverage98.7%structured + attachments

Validation Gates9/112 pending approvals

Readiness82%controlled shutdown pending

Retirement Lifecycle governed execution path

InventoryOwner · capability · platform · environments · criticality

→

DependenciesInbound/outbound interfaces · jobs · DB links · identities

→

ExtractData · attachments · metadata · schema · configuration

→

ArchivePreserved context · manifests · checksums · searchable access

→

ValidateCounts · reconciliation · referential integrity · sampling

→

ShutdownControlled stop · revoke access · remove infrastructure · close CMDB

Retirement Readiness Gates APP-FIN-021

✓

Business owner approvalRetirement scope and replacement capability confirmed.

COMPLETE

✓

Dependency discovery completeInbound/outbound traffic, schedules and integrations reviewed.

COMPLETE

✓

Retention classification assignedRequired records, legal holds and disposal authority documented.

COMPLETE

Final reconciliationRecord-count and checksum sign-off awaiting Data Owner.

PENDING

Change approval / shutdown windowProduction stop requires approved change and communications.

PENDING

Selected Retirement Candidate system of record

Application ID: APP-FIN-021

Name: Legacy Billing & Statement Archive

Business Owner: Finance Operations

Technical Owner: Enterprise Applications

Production: Windows Server / SQL Server / file attachments

Replacement: Cloud Billing Platform

Retirement State: VALIDATION

Target Shutdown: Change window pending

Application Inventory retirement candidate register

App ID	Application	Owner	Criticality	Platform	Primary Data Store	Lifecycle	Target
APP-FIN-021	Legacy Billing & Statement Archive	Finance Ops	Tier 2	Windows / .NET	SQL Server + NAS	RETIRE	Q4
APP-HR-014	HR Case Repository	People Services	Tier 2	Java / Linux	Oracle	ASSESS	TBD
APP-OPS-006	Dispatch History	Operations	Tier 3	Windows	SQL Server	ARCHIVED	Complete
APP-CRM-003	Legacy Customer Notes	Customer Care	Tier 2	Web / PHP	MySQL + file share	RETIRE	Q4

Inventory Attributes

Business capabilityApplication ownerTechnical ownerEnvironmentServers / VMsDatabasesStorageInterfacesSchedulersLicensesDNS / certificatesDR / backup

Disposition Decision

Retain capability?: No

Replacement live?: Yes

Historical access?: Required

Active legal hold?: No

Archive required?: Yes

Evidence

Owner attestation, architecture diagram, CMDB record, production host list, database inventory, interface register, retention mapping and retirement approval are attached to the retirement record.

Dependency closure is a hard gate. Confirm actual inbound and outbound communications before stopping the application. Architecture diagrams alone may be stale; observed traffic, job schedules and owner confirmation are captured as evidence.

Dependency Map APP-FIN-021

ERP FinanceInbound nightly account feed · SFTP

Identity ProviderSSO / directory group lookup

Enterprise SchedulerNightly extract and report job

APP-FIN-021retirement candidate

Data WarehouseOutbound billing history feed

Print ServiceStatement spool / batch output

Archive RepositoryTarget preserved records

Dependency Register 17 discovered

Type	Endpoint	Direction	Protocol	Closure
File Transfer	ERP Account Feed	Inbound	SFTP	REROUTED
Database	DW Billing Mart	Outbound	SQL job	VERIFY
Scheduler	FIN_NIGHTLY_021	Inbound	Agent	DISABLE AT CUTOVER
Identity	AD group FIN-BILL-USERS	Inbound	LDAP / SSO	REVOKE
Print	Statement Queue	Outbound	SMB / spool	REPLACED

Extraction Plan preservation scope

Source application

Extraction mode

Data scope

Cutoff strategy

Schema capture

Output

Extraction Jobs 4 executions

Job	Scope	Rows / Files	Checksum	Status
EXT-021-B01	Baseline structured data	18,442,190 rows	Manifested	Complete
EXT-021-A01	Statement attachments	2,861,442 files	SHA-256	Complete
EXT-021-R01	Reference / lookup data	87 tables	Manifested	Complete
EXT-021-D01	Final delta	Pending freeze	—	Pending

Preservation Package Contents minimum evidence set

Data

Structured records, unstructured attachments, binary objects and required reference data.

Context

Schema, data dictionary, code mappings, relationships, source identifiers and business labels.

Evidence

Export logs, row/file counts, manifests, checksums, exceptions, timestamps and operator approvals.

Archive Sets32 validated

Structured Rows18.4Mnormalized

Attachments2.86Mmanifested

Integrity100%sample verified

Access ModeROread-only archive

Archive Set Registry

Archive Set	Source	Content	Retention Class	State
AR-FIN-021-01	APP-FIN-021	Billing history	FIN-7Y	VALIDATED
AR-FIN-021-02	APP-FIN-021	Statements + attachments	FIN-7Y	VALIDATED
AR-FIN-021-03	APP-FIN-021	Final delta / closure	FIN-7Y	PENDING

Archive Controls

Storage mode: Read-only / immutable policy capable

Search: Metadata + full-text where available

Context: Source application, table/entity, business labels, original IDs

Integrity: Manifest + checksums + reconciliation evidence

Retention: Policy / event / hold aware

Audit: Access, export, hold, disposal and administrative events

Retention Policy Mapping archive-controlled

Class	Record Category	Trigger	Period	Hold	Disposition
FIN-7Y	Billing / statements	Account close / fiscal close	7 years	None	Review then destroy
FIN-LH	Litigation subject records	Hold issuance	Indefinite while held	ACTIVE	Blocked
AUD-10Y	Audit evidence	Closure approval	10 years	None	Authorized disposition

Legal Hold Controls

Hold ID: LH-2026-0041

Scope: Selected customer accounts / billing periods

Preservation: Deletion and disposal suspended

Custodian: Legal Operations

Audit: Hold placement, modification and release tracked

Release: Requires authorized legal instruction

Retirement does not terminate information obligations. Required historical data remains governed by retention schedules, privacy rules, legal holds, audit requirements and defensible disposition.

Row Count Match100%baseline sets

File Manifest100%2.86M objects

Checksum Sample100%pass

RI Checks99.99%14 exceptions reviewed

Business UATPASShistorical retrieval

Validation Matrix

Control	Source	Archive	Result	Evidence
Record counts	18,442,190	18,442,190	PASS	VAL-021-001
Attachment inventory	2,861,442	2,861,442	PASS	VAL-021-002
Checksum sample	10,000	10,000	PASS	VAL-021-003
Referential integrity	14 exceptions	14 preserved	ACCEPTED	VAL-021-004
Historical search / retrieval	25 scenarios	25 scenarios	PASS	UAT-021-01

Exit Criteria

✓

Data reconciliation completeSource and archive totals reconciled.

PASS

✓

Historical access testedBusiness users can locate and render required records without the source application.

PASS

✓

Retention / hold behavior verifiedProtected records cannot be disposed while under active policy or hold.

PASS

Final delta validationRuns after production read-only freeze.

PENDING

Controlled shutdown sequence. The application is not considered retired until dependencies are closed, required data is preserved, access and scheduled activity are disabled, infrastructure is removed or transferred, asset records are updated and closure evidence is accepted.

Decommission Runbook change-controlled

Freeze production writesPlace source application in read-only state and confirm transaction cutoff.

CUTOVER

Execute final delta extractionCapture post-baseline changes and create final manifest.

PENDING

Reconcile and obtain sign-offCounts, checksums, integrity and business retrieval validation.

PENDING

Disable schedules and interfacesStop cron/scheduler jobs, SFTP feeds, API calls, queues and integration agents.

PLANNED

Stop application servicesControlled application stop; monitor for unexpected inbound/outbound traffic.

PLANNED

Revoke access and credentialsDisable service accounts, SSO groups, API secrets, certificates and privileged access.

PLANNED

Remove infrastructure dependenciesDatabase, storage, DNS/LB, monitoring, backup, DR and network objects after evidence review.

PLANNED

Release license / support contractsConfirm no residual entitlement or renewal obligation.

PLANNED

Update CMDB and architecture recordsMark application retired and record archive location / access owner.

PLANNED

Closure approvalBusiness, technical, data/records and change authorities accept final retirement evidence.

PLANNED

Shutdown Safeguards

No destructive removal before archive validation.

Keep rollback / recovery materials only as long as the approved change and retention model requires.

Confirm no active network or job dependency remains after controlled stop.

Record license, asset, CMDB, monitoring and support closure to realize cost savings.

Authorization

Change record: CHG-2026-1184

Business owner: Pending

Data / Records: Approved

Security: Approved

Shutdown window: Not scheduled

Legacy Data Search read-only archive access

Account / customer / source ID

Record category

Source ID	Record Type	Period	Archive Set	Retention	Status
ACCT-004821	Statement	2023-12	AR-FIN-021-02	FIN-7Y	Available
ACCT-004821	Billing history	2023	AR-FIN-021-01	FIN-7Y	Available

Authentication / Authorization archive + retirement administration

Retirement Administrator

Privileged role for planning and executing decommission activities. Destructive actions require approved change / dual authorization where configured.

SSO (SAML/OIDC)MFA requiredRBACLeast privilegeSession timeoutPrivileged approvalService identity inventoryAudit logging

Access Control Register

Identity	Type	Purpose	Cutover Action	State
FIN-BILL-USERS	Directory group	Source UI access	Disable	PLANNED
svc_fin_bill	Service account	App / DB runtime	Revoke after stop	PLANNED
svc_fin_extract	Service account	Final archive extraction	Expire after validation	TEMPORARY
ArchiveReader-FIN	Archive role	Historical access	Retain	ACTIVE

Retirement Audit Trail evidence chain

Timestamp	Event	Object	Actor	Result	Evidence ID
2026-09-22 08:42	Archive validation completed	AR-FIN-021-02	Data Steward	PASS	VAL-021-003
2026-09-22 08:16	Retention class assigned	AR-FIN-021-01	Records Manager	FIN-7Y	RET-021-004
2026-09-21 17:02	Dependency marked rerouted	ERP Account Feed	Integration Owner	CLOSED	DEP-021-011
2026-09-21 15:44	Baseline extraction finalized	EXT-021-B01	Retirement Admin	COMPLETE	EXTLOG-021-01

Evidence Types

Owner approvalDependency reportsExport logsManifestsChecksumsValidation reportsChange recordAccess revocationCMDB closure

Closure Status

Evidence package: RETIRE-APP-FIN-021

Completeness: 82%

Open exceptions: 2

Audit Principle

A defensible retirement record explains what was retired, what data was preserved or disposed, which dependencies were closed, who approved each gate, and when access/infrastructure was removed.

Lab Scope

Vendor-neutral engineering demonstration for legacy application retirement, modernization and migration planning. The lab models application inventory, dependency analysis, extraction, compliant archival, retention/legal hold, validation, authentication, controlled shutdown and retirement evidence.

Operator Checklist

Confirm ownerCapture dependenciesPreserve dataAssign retentionValidate archiveApprove changeControlled stopRevoke accessRemove infrastructureClose CMDB

Enterprise Resources Samuels Enterprises

Enterprise Portfolio: samuelsenterprisesllc.com/enterprise

Support: support@samuelsenterprisesllc.com

Engineering demonstration: sample records and metrics are illustrative. The operating model is designed to resemble the language, controls and workflow expected in enterprise application-decommissioning programs without representing a specific commercial product.