[CSM Portal] Add PostgresPrimarySNFallback DataSource: case metadata pilot + SN-only attachments - #1857
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rksk merged 5 commits intoSep 21, 2026
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📝 WalkthroughWalkthroughThe entity service adds a PostgreSQL-primary data source with ServiceNow case creation, attachment routing, asynchronous WorkState mirroring, and durable writeback failure records. Configuration, repositories, migrations, services, routes, and tests support the new mode. ChangesPostgres-primary ServiceNow fallback
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant Client
participant CaseService
participant ServiceNow
participant CaseRepository
Client->>CaseService: Create case
CaseService->>ServiceNow: Create case with retry
ServiceNow-->>CaseService: Return case identity
CaseService->>CaseRepository: Persist returned identity
CaseRepository-->>Client: Return case
Suggested reviewers: Merge Risk: 🟡 Moderate · up to During ServiceNow backlog conditions, case updates can wait on writeback-failure persistence instead of returning promptly. Make full-queue recording nonblocking before merging. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 74.19% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 31 functions across 11 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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…m only Adds config.DataSourcePostgresPrimarySNFallback: Postgres stays the sole read/write source, and a new SNWritebackDispatcher (internal/service/ sn_writeback.go) runs a best-effort, one-way mirror write to ServiceNow on a small bounded worker pool, detached from the triggering request's context so it isn't cancelled when the response returns. No retry logic - a single attempt, and a failed mirror write is durably recorded in the new sn_writeback_failures table (migration 000073, mirroring event_publish_failures' shape) via SNWritebackFailureRepository, plus a WARN log, so ServiceNow can stay a genuine rollback target instead of silently drifting stale ahead of the Postgres cutover. Config.Validate now requires both a full database AND full ServiceNow integration service credentials for this mode, since it is the only one that needs both legs at once. NOT wired to any entity yet - see this branch's open question about the account entity having no create/update path in this service to hook it into (account is read-only here; writes land only via the Salesforce webhook ingestion path, and sn_account_service.go has no write method to call). Dispatch and the failure table are otherwise ready for a first real caller once that's resolved.
Wires SNWritebackDispatcher onto DATA_SOURCE=postgres-primary-sn-fallback's
case UPDATE path, scoped narrowly to the WorkState field:
- caseService gains a second constructor, NewCaseServiceWithSNWriteback
(NewCaseService itself is untouched, so every existing call site and test
keeps working as-is). UpdateCase now dispatches a best-effort ServiceNow
mirror write after a successful Postgres commit, but only when
req.WorkState is set - never for State or Severity.
- routes.go constructs a plain (never-active) snCaseService under the new
DataSource purely as the mirror target for that dispatch, and extends the
serviceNowIntegrationServiceClient/snUserService construction to also
cover this DataSource (config.Validate already requires the same SN
credentials for it).
Why WorkState only: snCaseService.UpdateCase - the DataSource=servicenow
method this mirrors, and the only place the real PATCH /cases/{id} call to
ServiceNow lives - does a live GetCaseByID read against ServiceNow before
its PATCH whenever State or Severity is set, to detect a no-op change before
deciding whether to publish an event. This mode's whole premise is that
ServiceNow is never read from, so mirroring State/Severity would mean either
breaking that invariant or refactoring snCaseService.UpdateCase into a
read-free PATCH-only helper - real surgery on code still serving live
DataSource=ServiceNow production traffic today. Deferred as its own
separate, reviewed piece of work; not folded into this pilot. WorkState's
branch has no such read, so it mirrors cleanly as-is.
CreateCase is NOT wired either - its Postgres path still does
INSERT INTO cases (nonexistent table), deliberately left broken pending an
unrelated, unresolved work_item.number/wso2_id generation decision (see
CaseRepository.CreateCase's own doc comment). Nothing to mirror from there
yet.
The async, Postgres-first pattern the WorkState UPDATE pilot uses has a real flaw for CREATE specifically: a background ServiceNow write that fails after Postgres already committed would leave a permanent orphan - a Postgres row with no ServiceNow counterpart, and every later comment/attachment/ state-change on that case would have no ServiceNow parent to attach to. Under DATA_SOURCE=postgres-primary-sn-fallback, case creation is now ServiceNow-first and synchronous instead: - caseService.CreateCase calls the mirror's CreateCase (the same creation logic DataSource=servicenow already runs) synchronously, with a bounded 2-attempt retry (a few hundred ms apart) to absorb a transient blip. A ValidationError is never retried - the same invalid input fails the same way every time. - If ServiceNow still fails after retry, the error is returned as-is and Postgres is never touched - no orphan gets created. - If ServiceNow succeeds, its own id (converted sys_id)/number/internalId/ createdBy are used AS-IS for the Postgres insert via a new repository method, CaseRepository.CreateCaseFromServiceNow, rather than generated - both systems agree on identity from the moment the Postgres row exists. This also unblocks CreateCase's own well-known bug: the previous INSERT referenced a "cases" table that doesn't exist, using columns (internal_id/created_at/updated_at/closed_at/case_type_enum) that don't exist either - not a simple rename like the earlier six-repo table-name fix, since it never matched the real work_item + "case" shared-primary-key schema at all. CreateCaseFromServiceNow is a proper two-table INSERT (CTE, same shape as the existing updateCaseQuery) confirmed against the actual migrations (000016/000018/000035/000036/000037), reusing scanUpdatedCase's column order rather than duplicating it. This sidesteps rather than answers the still-unresolved question of Postgres-native number/wso2_id generation (no sequence exists, no format was ever decided): ServiceNow is the identity source in this mode. The plain (non-fallback) CreateCase path is completely unchanged and still deliberately non-functional. Scoped to case creation only - no other entity's create path is touched, and UPDATE's WorkState mirror (previous commit) is unchanged.
…ck mode Case attachments must stay ServiceNow-only, permanently, regardless of how case metadata itself is wired: the sftpgo-backed Postgres attachment implementation (case_attachments table) is real, working SQL, but is not production-ready for the Oct 4 go-live. Investigated first rather than assumed: - DataSource=servicenow: attachment routes already went through snCaseService (activeCaseSvc itself). Correct, unchanged. - DataSource=postgres (default): attachment routes go through the Postgres-backed case_attachments implementation. Deliberately left as-is - out of scope per this task, not the mode this fix targets. - DataSource=postgres-primary-sn-fallback: activeCaseSvc in this mode is the Postgres-backed caseService (for case CREATE/UPDATE), so attachment routes were also reaching the Postgres-backed path here - the gap to close, since this mode's case metadata being Postgres-backed does not mean its attachments should be. Fix: routes.go now builds a second CaseHandler (attachmentHandler) backed by a separate service selection (activeAttachmentSvc) for the seven /attachments* routes specifically, decoupled from activeCaseSvc. Under postgres-primary-sn-fallback it points at the same snCaseService instance already built for the case CREATE/UPDATE pilot (caseAttachmentOverrideSvc) - every one of its attachment methods already converts the platform case UUID to a ServiceNow sys_id internally (uuidToSysid), which round-trips correctly because case CREATE in this mode already stores id = sysidToUUID(the real sys_id) for every case. Every other DataSource's attachment routing is unchanged (activeAttachmentSvc defaults to activeCaseSvc, same as before this override existed). Added a routes-level test pair: one proves postgres-primary-sn-fallback's attachment create reaches a fake ServiceNow integration service (not a nil Postgres pool), the other confirms plain postgres attachment create still reaches the Postgres path (the "storageKey is required" validation message is specific to that path) - a control showing this change didn't touch plain postgres's own behavior.
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@entity-service/internal/service/sn_writeback.go`:
- Around line 159-169: Update the full-queue fallback in Dispatch so the
snWritebackJob passed to d.run executes in a background goroutine, ensuring
failure recording does not block the caller. Preserve the existing queue-full
warning and errQueueFull handling, and leave the normal queued path unchanged.
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entity-service/internal/config/config.goentity-service/internal/config/config_test.goentity-service/internal/domain/entity.goentity-service/internal/repository/case_repo.goentity-service/internal/repository/sn_writeback_failure_repo.goentity-service/internal/server/case_attachment_routing_test.goentity-service/internal/server/routes.goentity-service/internal/service/case_service.goentity-service/internal/service/case_service_test.goentity-service/internal/service/sn_writeback.goentity-service/internal/service/sn_writeback_test.goentity-service/migrations/000076_create_sn_writeback_failures.down.sqlentity-service/migrations/000076_create_sn_writeback_failures.up.sql
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…a local DB insert, not zero latency CodeRabbit correctly flagged that the doc comment's "does not block the caller" overclaimed: the queue-full branch synchronously records the drop via a local Postgres insert before Dispatch returns. It never touches ServiceNow (that guarantee holds), but it isn't zero-latency either. Fixed the comment to say what the code actually does, and why the synchronous insert is deliberate rather than a bug (avoids piling more work into a goroutine against a queue that's already full). No behavior change; existing tests unaffected.
Rashmika998
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Sep 21, 2026
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Purpose
Piloted on
case: metadata UPDATE (WorkState field only), SN-first CREATE, and — as of the latest commit — attachments routed permanently to ServiceNow regardless of this mode's own case-metadata wiring. The mechanism (dispatcher + failure table) is reusable for other entities/fields once each is confirmed safe the same way these were.Goals
Approach
Mechanism (commit 1):
DataSourcePostgresPrimarySNFallbackconfig value,sn_writeback_failuresmigration/repo, andSNWritebackDispatcher(4-worker bounded pool, 10s timeout, context detached from the caller, no retry — WARN + a failure row on error).Case UPDATE pilot, WorkState only (commit 2):
caseService.UpdateCasedispatches a best-effort, asynchronous mirror write after a successful Postgres commit, gated strictly onreq.WorkState != nil. Not State/Severity:snCaseService.UpdateCasedoes a liveGetCaseByIDread against ServiceNow before its PATCH whenever State or Severity is set, which this mode must never do — deferred pending a separate refactor, out of scope here.Case CREATE, made ServiceNow-first (commit 3): wiring CREATE the same Postgres-first/async way as UPDATE surfaced a real flaw: a background ServiceNow write that fails after Postgres already committed leaves a permanent orphan. So CREATE calls the mirror's
CreateCasesynchronously first (bounded 2-attempt retry, ~300ms apart,ValidationErrornever retried), and only writes to Postgres — via a newCaseRepository.CreateCaseFromServiceNow, using ServiceNow's ownid/number/internalId/createdByas-is — once ServiceNow succeeds. This also unblocksCreateCase's known table/schema bug (a proper two-table CTE insert, confirmed against the real migrations, replaces the old query that never matched the schema at all). The plain (non-fallback)CreateCasepath is unchanged and still deliberately non-functional.Case attachments routed to ServiceNow, permanently (commit 4): investigated how attachment routes (
/attachments*, 7 routes backed bysn_case_service.go's attachment methods) were wired under each DataSource, rather than assuming:DataSource=servicenow: already SN (activeCaseSvcitself issnCaseService). Correct, untouched.DataSource=postgres(default): routes to the Postgres-backedcase_attachmentsimplementation — real, working SQL (confirmed; not the same broken-schema issueCreateCasehad), but not what this task targets. Left completely unchanged — out of scope.DataSource=postgres-primary-sn-fallback: was also reaching the Postgres-backed path (sinceactiveCaseSvcin this mode is Postgres-backed for case metadata) — a real gap, since this mode's case metadata being Postgres-backed doesn't mean its attachments should be. The sftpgo-backed Postgres attachment implementation isn't production-ready for Oct 4.Fix:
routes.gonow builds a secondCaseHandler(attachmentHandler, backed byactiveAttachmentSvc) for the 7 attachment routes specifically, decoupled fromactiveCaseSvc. Under the fallback mode it points at the samesnCaseServiceinstance already built for CREATE/UPDATE's mirror — its attachment methods already convert the platform case UUID to a ServiceNowsys_idinternally (uuidToSysid), which round-trips correctly because CREATE in this mode already storesid = sysidToUUID(the real sys_id). Every other DataSource's attachment routing is byte-for-byte unchanged.Scoped to
caseonly throughout — no other entity's create/update/attachment path is touched.Rebased onto
dev-app-csm-portal(commit 4 → post-rebase): base had moved since this branch was cut; resolved cleanly with no design decisions needed.case_service_test.gowas a purely additive collision (kept both).case_repo.gohad a real but non-overlapping collision: another engineer independently fixedCreateCase's table/schema bug the same day via a properwork_item+"case"transaction that still deliberately refuses to generate case numbers — zero semantic overlap with this PR's ServiceNow-firstCreateCaseFromServiceNowpath, both kept in full. Self-caught (not a git conflict): the new migration had grabbed sequence number000073, independently claimed by upstream for000073_group_table— renumbered to000076to avoid the collision.User stories
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New Features
Bug Fixes