feat(pending-updates): short-circuit an unchanged fleet on a DB rowversion watermark (#62)
Owner decision (b), 2026-11-09. PendingUpdatesEvaluator re-flattened every deployed instance on each cache-TTL expiry even when nothing had changed. - Migration AddConfigGraphRowVersions: a non-concurrency rowversion column + index on the 18 configuration tables the evaluation reads (Templates + 5 member tables, Instances + 4 override/binding tables, DataConnections, DeployedConfigSnapshots, Sites, SharedScripts, ExternalSystemDefinitions, ExternalSystemMethods, DatabaseConnectionDefinitions). SQL Server only in the model; SQLite test contexts are untouched. Script: docs/plans/sql/AddConfigGraphRowVersions.sql. Joins the coordinated central-pair migration window (#107 item 4). - IConfigGraphWatermarkReader / ConfigGraphWatermarkReader: ONE query of MAX(RowVersion) + COUNT_BIG(*) per table (count catches deletes, which raise no rowversion). rowversion is engine-bumped for any writer, so a peer central node's edit moves it — not the per-process watermark MG-3 removed. - The secret store (outside the DB) gets its own stamp: SHA-256 over ListAsync(includeDeleted: true) metadata. - Evaluator re-serves the last CLEAN snapshot while watermark + secret stamp are unchanged; every PendingUpdatesFullEvaluationEvery'th (default 10, validated >= 1, 1 = off) is full regardless — the safety net for a same-KEK re-wrap or an input table missing from the set. Always full when the token is unavailable/unreadable, after an evaluation that could not compute a site's artifact hash, on Re-check, and after a deploy completion. It only re-serves a real earlier answer, never manufactures one. Tests: SQL Server (real migrated DB) — token stable without writes, moves for a peer-connection INSERT/UPDATE and a non-max DELETE, moves for a local EF write, a detached Update still saves (not a concurrency token), and a guard that every table the evaluator's repository reads touch is covered. Evaluator — reuse without flatten (re-served answer still shows the stale instance), watermark move, 4 secret changes, every-Nth, 5 no-token modes, unclean evaluation not reused, cache Re-check and deploy completion force full. Mutation-proven: token compare, clean check, cache force flag, row count, and an uncovered read each turn tests red. Claude-Session: https://claude.ai/code/session_01GT67AEHd2Acv1YPwGfXEoV
This commit is contained in:
Joseph Doherty
@@ -72,8 +72,26 @@ Three Central UI changes, requested together:
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(default 60 s, validated > 0), running the evaluator in its own DI scope. `GetAsync(forceRefresh)`.
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Consequence: however many circuits poll, the fleet is flattened at most once per TTL, and not at
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all when nobody is looking.
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- Not in scope (register rows): a template-graph-watermark short-circuit so an unchanged fleet costs
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no re-flatten; a `deploy` CLI/`Health` KPI surface for the counts.
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- Not in scope (register rows): a `deploy` CLI/`Health` KPI surface for the counts.
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- **Unchanged-fleet short-circuit (Gitea #62, register row 124, owner decision (b) 2026-11-09).** Before
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the fleet pass the evaluator reads a change token = `IConfigGraphWatermarkReader` (ONE query:
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`MAX(RowVersion)` + `COUNT_BIG(*)` per table over the 18 input tables — Templates + their five member
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tables, Instances + their four override/binding tables, DataConnections, DeployedConfigSnapshots, Sites,
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SharedScripts, ExternalSystemDefinitions, ExternalSystemMethods, DatabaseConnectionDefinitions; migration
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`AddConfigGraphRowVersions`, list in `ConfigGraphRowVersions`) **plus** a SHA-256 stamp over the secret
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store's `ListAsync(includeDeleted: true)` metadata (name, revision, created/updated, tombstone, KEK id,
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content type, description). Equal to the token read before the last *clean* full evaluation → the
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previous snapshot is re-served (with a fresh `ComputedAt`). rowversion is database-wide and engine-bumped,
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so a peer central node's edit, a bundle import or an `ExecuteUpdate` all move it; the count catches a
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delete (which raises no rowversion). It is deliberately not the per-process template-graph watermark
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(MG-3). Safety net: every `PendingUpdatesFullEvaluationEvery`th evaluation (default 10 ≈ 10 min at the
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60 s TTL; `1` disables the short-circuit) is full regardless — it covers a same-KEK re-wrap (wrap
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envelope changes, revision does not) and any input table someone forgets to add (a SQL Server guard
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test fails if a repository read used by the evaluator touches an uncovered table). Always full: watermark
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unavailable (non-SQL-Server provider) or unreadable, secret listing fails, the previous evaluation could
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not compute a site's artifact hash (secret-store outage — re-serving it would pin a transient *Out of
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date*), a *Re-check* (`forceRefresh`), and the evaluation after a deploy completion. It never
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manufactures an answer — it only re-serves a real earlier one.
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### 3.3 Sites page (Admin)
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@@ -0,0 +1,84 @@
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-- AddConfigGraphRowVersions (2026-11-10, ScadaBridge#62). A rowversion column + index on the 18 configuration
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-- tables feeding the pending-updates evaluation, so PendingUpdatesEvaluator can skip the fleet flatten when
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-- MAX(RowVersion)+COUNT_BIG(*) over them is unchanged. Additive: SQL Server fills every existing row as the
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-- column is added; old binaries ignore the column. Apply after AddAuditLogHashChain in the coordinated
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-- central-pair migration window (ScadaBridge#107 item 4).
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BEGIN TRANSACTION;
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ALTER TABLE [TemplateScripts] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [Templates] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [TemplateNativeAlarmSources] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [TemplateCompositions] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [TemplateAttributes] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [TemplateAlarms] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [Sites] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [SharedScripts] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [Instances] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [InstanceNativeAlarmSourceOverrides] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [InstanceConnectionBindings] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [InstanceAttributeOverrides] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [InstanceAlarmOverrides] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [ExternalSystemMethods] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [ExternalSystemDefinitions] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [DeployedConfigSnapshots] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [DataConnections] ADD [RowVersion] rowversion NOT NULL;
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ALTER TABLE [DatabaseConnectionDefinitions] ADD [RowVersion] rowversion NOT NULL;
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CREATE INDEX [IX_TemplateScripts_RowVersion] ON [TemplateScripts] ([RowVersion]);
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CREATE INDEX [IX_Templates_RowVersion] ON [Templates] ([RowVersion]);
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CREATE INDEX [IX_TemplateNativeAlarmSources_RowVersion] ON [TemplateNativeAlarmSources] ([RowVersion]);
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CREATE INDEX [IX_TemplateCompositions_RowVersion] ON [TemplateCompositions] ([RowVersion]);
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CREATE INDEX [IX_TemplateAttributes_RowVersion] ON [TemplateAttributes] ([RowVersion]);
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CREATE INDEX [IX_TemplateAlarms_RowVersion] ON [TemplateAlarms] ([RowVersion]);
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CREATE INDEX [IX_Sites_RowVersion] ON [Sites] ([RowVersion]);
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CREATE INDEX [IX_SharedScripts_RowVersion] ON [SharedScripts] ([RowVersion]);
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CREATE INDEX [IX_Instances_RowVersion] ON [Instances] ([RowVersion]);
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CREATE INDEX [IX_InstanceNativeAlarmSourceOverrides_RowVersion] ON [InstanceNativeAlarmSourceOverrides] ([RowVersion]);
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CREATE INDEX [IX_InstanceConnectionBindings_RowVersion] ON [InstanceConnectionBindings] ([RowVersion]);
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CREATE INDEX [IX_InstanceAttributeOverrides_RowVersion] ON [InstanceAttributeOverrides] ([RowVersion]);
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CREATE INDEX [IX_InstanceAlarmOverrides_RowVersion] ON [InstanceAlarmOverrides] ([RowVersion]);
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CREATE INDEX [IX_ExternalSystemMethods_RowVersion] ON [ExternalSystemMethods] ([RowVersion]);
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CREATE INDEX [IX_ExternalSystemDefinitions_RowVersion] ON [ExternalSystemDefinitions] ([RowVersion]);
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CREATE INDEX [IX_DeployedConfigSnapshots_RowVersion] ON [DeployedConfigSnapshots] ([RowVersion]);
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CREATE INDEX [IX_DataConnections_RowVersion] ON [DataConnections] ([RowVersion]);
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CREATE INDEX [IX_DatabaseConnectionDefinitions_RowVersion] ON [DatabaseConnectionDefinitions] ([RowVersion]);
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INSERT INTO [__EFMigrationsHistory] ([MigrationId], [ProductVersion])
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VALUES (N'20261110032839_AddConfigGraphRowVersions', N'10.0.13');
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COMMIT;
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GO
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