v1.8.11.0: Fix New-sqmOlaUsrDbBackupJob exclude prefix - '!' was never valid Ola syntax

Ola Hallengren's DatabaseBackup only recognizes '-' as the exclude marker
(DatabaseItem LIKE '-%'); '!' was introduced in v1.8.6.0 by mistake and
never worked, causing exclusions to silently no-op and the resulting
"do not exist" warning list to exceed RAISERROR's 2047-char substitution
limit - masking the real failure in job history on BLBNBGFATDBA3.

Fix prefix to '-' and add EXISTS(sys.databases) filter so only databases
that actually exist on the target instance are added to the exclude list.
Verified end-to-end on DEV02: full backup run, 0 "do not exist" messages,
all active exclusions correctly skipped.

Author: Uwe Janke

CHANGELOG.md

@@ -1,5 +1,28 @@
 # sqmSQLTool — Changelog
 
+## [1.8.11.0] — 2026-07-02
+
+### Bugfix
+
+**`New-sqmOlaUsrDbBackupJob`** — Exclude-Prefix `!` war nie gueltige Ola-Syntax
+- Ursache eines echten Produktionsvorfalls (BLBNBGFATDBA3, `DatabaseBackup`-Job
+  schlug fehl): der in v1.8.6.0 eingefuehrte `!`-Prefix fuer Exclusions
+  (`USER_DATABASES,!db1,!db2`) wird von Ola Hallengrens `MaintenanceSolution.sql`
+  nirgends ausgewertet — dort wird ausschliesslich `-db1` als Exclude-Marker
+  erkannt (`DatabaseItem LIKE '-%'`). Alle `!`-Eintraege wurden dadurch als
+  positive (nicht existierende) Datenbanknamen interpretiert: Exclusions griffen
+  nie, und die daraus resultierende lange "do not exist"-Warnliste sprengte das
+  2047-Zeichen-Limit von `RAISERROR('%s', ...)`, wodurch die eigentliche
+  Fehlermeldung im Job-Verlauf unsichtbar wurde.
+- Fix: Prefix auf `-` korrigiert. Zusaetzlich Filter `EXISTS (SELECT 1 FROM
+  sys.databases ...)`, sodass nur Datenbanken, die auf der jeweiligen Instanz
+  tatsaechlich existieren, in die Exclude-Liste aufgenommen werden — verhindert
+  erneutes Anwachsen der "do not exist"-Liste bei einer instanzuebergreifend
+  gepflegten `sqm_BackupExclude`-Tabelle.
+- Verifiziert auf DEV02: kompletter FULL-Backup-Lauf ueber die neu generierte
+  Prozedur, 0 "do not exist"-Meldungen, alle aktiven Exclusions korrekt
+  uebersprungen.
+
 ## [1.8.10.0] — 2026-07-02
 
 ### Bugfix

Public/New-sqmOlaUsrDbBackupJob.ps1

@@ -14,9 +14,10 @@
         OlaJobNameLog   (Default: 'OlaHH-UserDatabases-LOG')
 
     When -UseExcludeTable is set, the function reads master.dbo.sqm_BackupExclude
-    (created by Sync-sqmBackupExcludeTable) for entries where IsActive=1 AND IsOrphaned=0.
-    If entries are found, they are prepended with '!' and appended to the @Databases parameter in the
-    generated job step command. If the table does not exist or contains no matching rows,
+    (created by Sync-sqmBackupExcludeTable) for entries where IsActive=1 AND IsOrphaned=0
+    AND the database actually exists on this instance (sys.databases). If entries are found,
+    they are prepended with '-' (Ola's exclude prefix) and appended to the @Databases parameter
+    in the generated job step command. If the table does not exist or contains no matching rows,
     the -Databases parameter is used unchanged.
 
 .PARAMETER SqlInstance
@@ -109,9 +110,10 @@
     Continue with remaining jobs if one job fails.
 
 .PARAMETER UseExcludeTable
-    When set, reads master.dbo.sqm_BackupExclude for active, non-orphaned entries and
-    adds them as '!DatabaseName' exclusions to the @Databases parameter of Ola's DatabaseBackup.
-    If the table does not exist or is empty, the Databases parameter is used unchanged.
+    When set, reads master.dbo.sqm_BackupExclude for active, non-orphaned entries that exist
+    on this instance and adds them as '-DatabaseName' exclusions to the @Databases parameter
+    of Ola's DatabaseBackup. If the table does not exist or is empty, the Databases parameter
+    is used unchanged.
 
 .PARAMETER CreateSyncJob
     When -UseExcludeTable is set, automatically creates a SQL Agent job that runs
@@ -556,10 +558,11 @@ BEGIN
     BEGIN
         DECLARE @Exclusions NVARCHAR(MAX);
         SELECT @Exclusions = STUFF((
-            SELECT ',' + '!' + DatabaseName
-            FROM   master.dbo.sqm_BackupExclude
-            WHERE  IsActive   = 1
-              AND  IsOrphaned = 0
+            SELECT ',-' + e.DatabaseName
+            FROM   master.dbo.sqm_BackupExclude e
+            WHERE  e.IsActive   = 1
+              AND  e.IsOrphaned = 0
+              AND  EXISTS (SELECT 1 FROM sys.databases d WHERE d.name = e.DatabaseName)
             FOR XML PATH(''), TYPE
         ).value('.', 'NVARCHAR(MAX)'), 1, 1, '');
         IF @Exclusions IS NOT NULL AND @Exclusions <> ''

sqmSQLTool.psd1

@@ -17,7 +17,7 @@
 	RootModule			   = 'sqmSQLTool.psm1'
 
 	# Version number of this module.
-	ModuleVersion		   = '1.8.10.0'
+	ModuleVersion		   = '1.8.11.0'
 
 	# ID used to uniquely identify this module
 	GUID				   = 'c4b10ba2-aee2-4d8d-ad86-a6e97c346ba6'