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

2026-10-11 08:21:30 -04:00
parent db6a53036b
commit 924eff8d3c
13 changed files with 602 additions and 2 deletions
@@ -39,4 +39,9 @@ public interface IHistorianBackendProvider
    /// <param name="sp">Service provider.</param>
    /// <returns>The updater, or <c>null</c> when the backend does not support HistoryUpdate.</returns>
    IHistorianDataUpdater? CreateUpdater(IServiceProvider sp);
+
+    /// <summary>Creates the retention purge seam, if the backend manages retention in-process.</summary>
+    /// <param name="sp">Service provider.</param>
+    /// <returns>The purger, or <c>null</c> (default) when the backend has no retention or enforces it itself.</returns>
+    IHistorianRetention? CreateRetention(IServiceProvider sp) => null;
 }