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feat(historian): SQL Server retention purge (RetentionDays, Primary-gated, applock) (#667)

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Joseph Doherty
2026-10-11 08:21:30 -04:00
parent db6a53036b
commit 924eff8d3c
13 changed files with 602 additions and 2 deletions
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docs/Configuration.md
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@@ -411,6 +411,9 @@ Validated at host start (driver-role nodes) when `ServerHistorian:Enabled` **or*
| `ServerHistorian:SqlServer:Schema` | `hist` | Must match `^[A-Za-z_][A-Za-z0-9_]{0,127}$` (spliced into DDL/DML). |
| `ServerHistorian:SqlServer:CommandTimeout` | `00:00:30` | Must be `> 0`; rounded up to whole seconds. |
| `ServerHistorian:SqlServer:AutoCreateSchema` | `true` | `true` applies the embedded schema script under an app-lock on first use; `false` only verifies `SchemaVersion >= 1` and fails every historian call (health `LastError`, no crash) if behind. |
| `ServerHistorian:SqlServer:RetentionDays` | unset | Days of history kept (source time), `>= 1` when set; unset keeps everything. Enables the Primary-gated purge of `hist.Sample`/`hist.Event` (see [Historian.md](Historian.md#retention-retentiondays)). |
| `ServerHistorian:SqlServer:PurgeInterval` | `01:00:00` | Purge cadence; must be `> 0`. |
| `ServerHistorian:SqlServer:PurgeBatchSize` | `4000` | Rows per `DELETE TOP (n)` batch; `>= 1`. Keep under ~5000 to avoid lock escalation. |
#### `ServerHistorian:QuestDb` (`Backend=QuestDb`)