Fix File I/O chart 'Unknown' labels (#633)

CITATION.cff

@@ -0,0 +1,22 @@
+cff-version: 1.2.0
+title: "SQL Server Performance Monitor"
+message: "If you use this software, please cite it as below."
+type: software
+authors:
+  - given-names: Erik
+    family-names: Darling
+    affiliation: "Darling Data, LLC"
+    website: "https://erikdarling.com"
+repository-code: "https://github.com/erikdarlingdata/PerformanceMonitor"
+url: "https://erikdarling.com/free-sql-server-performance-monitoring/"
+license: MIT
+version: "2.3.0"
+date-released: "2026-03-18"
+keywords:
+  - sql-server
+  - performance-monitoring
+  - database-monitoring
+  - dba-tools
+  - mcp-server
+  - wait-stats
+  - execution-plans

Lite/Services/RemoteCollectorService.FileIo.cs

@@ -199,9 +199,9 @@ private static (string DatabaseName, string FileName, string FileType, string Ph
         int DatabaseId, int FileId) ReadFileIoRow(SqlDataReader reader)
     {
         return (
-            DatabaseName: reader.IsDBNull(0) ? "Unknown" : reader.GetString(0),
-            FileName: reader.IsDBNull(1) ? "Unknown" : reader.GetString(1),
-            FileType: reader.IsDBNull(2) ? "Unknown" : reader.GetString(2),
+            DatabaseName: reader.IsDBNull(0) ? $"DB_{reader.GetValue(13)}" : reader.GetString(0),
+            FileName: reader.IsDBNull(1) ? $"File_{reader.GetValue(14)}" : reader.GetString(1),
+            FileType: reader.IsDBNull(2) ? "UNKNOWN" : reader.GetString(2),
             PhysicalName: reader.IsDBNull(3) ? "" : reader.GetString(3),
             SizeMb: reader.IsDBNull(4) ? 0m : reader.GetDecimal(4),
             NumOfReads: reader.IsDBNull(5) ? 0L : reader.GetInt64(5),

install/08_collect_query_stats.sql

@@ -222,6 +222,38 @@ BEGIN
             row_hash binary(32) NULL
         );
 
+        /*
+        Pre-build list of ONLINE, accessible database IDs.
+        This prevents any downstream DMV calls (dm_exec_sql_text,
+        dm_exec_plan_attributes) from touching RESTORING databases
+        on passive mirror servers — which triggers severity 22 dumps.
+        */
+        CREATE TABLE 
+            #online_databases
+        (
+            database_id integer NOT NULL PRIMARY KEY,
+            database_name sysname NOT NULL
+        );
+
+        INSERT INTO 
+            #online_databases
+        (
+            database_id,
+            database_name
+        )
+        SELECT
+            d.database_id,
+            d.name
+        FROM sys.databases AS d
+        WHERE d.state = 0
+        AND   HAS_DBACCESS(d.name) = 1
+        AND   d.database_id NOT IN
+        (
+            1, 2, 3, 4, 32761, 32767,
+            DB_ID(N'PerformanceMonitor')
+        )
+        AND   d.database_id < 32761;
+
         INSERT INTO
             #query_stats_staging
         (
@@ -274,7 +306,7 @@ BEGIN
         )
         SELECT
             server_start_time = @server_start_time,
-            database_name = d.name,
+            database_name = od.database_name,
             sql_handle = qs.sql_handle,
             statement_start_offset = qs.statement_start_offset,
             statement_end_offset = qs.statement_end_offset,
@@ -353,23 +385,9 @@ BEGIN
                 qs.statement_start_offset,
                 qs.statement_end_offset
             ) AS tqp
-        CROSS APPLY
-        (
-            SELECT
-                dbid = CONVERT(integer, pa.value)
-            FROM sys.dm_exec_plan_attributes(qs.plan_handle) AS pa
-            WHERE pa.attribute = N'dbid'
-        ) AS pa
-        INNER JOIN sys.databases AS d
-          ON pa.dbid = d.database_id
+        INNER JOIN #online_databases AS od
+          ON st.dbid = od.database_id
         WHERE qs.last_execution_time >= @cutoff_time
-        AND   d.state = 0 /*ONLINE only — skip RESTORING databases (mirroring/AG secondary)*/
-        AND   pa.dbid NOT IN
-        (
-            1, 2, 3, 4, 32761, 32767,
-            DB_ID(N'PerformanceMonitor')
-        )
-        AND   pa.dbid < 32761 /*exclude contained AG system databases*/
         OPTION(RECOMPILE);
 
         /*

llms.txt

@@ -0,0 +1,20 @@
+# SQL Server Performance Monitor
+
+> Free, open-source SQL Server performance monitoring tool by Erik Darling (Darling Data, LLC). 32 T-SQL collectors, real-time alerts, graphical execution plan viewer, and a built-in MCP server with 51-63 tools for AI-powered analysis. Two editions: Full (server-installed with SQL Agent) and Lite (standalone desktop app with DuckDB storage). Replaces expensive commercial tools like SentryOne and Solarwinds DPA. MIT licensed.
+
+- Supports SQL Server 2016-2025, Azure SQL Managed Instance, AWS RDS for SQL Server, and Azure SQL Database (Lite only)
+- Monitors wait stats, query performance, blocking chains, deadlocks, memory grants, file I/O, tempdb, CPU, perfmon counters, and more
+- Real-time alerts via system tray notifications and styled HTML emails
+- Built-in MCP server exposes monitoring data to Claude Code, Cursor, and other LLM clients
+- 4,300+ downloads across releases
+
+## Documentation
+
+- [README](https://github.com/erikdarlingdata/PerformanceMonitor/blob/main/README.md): Complete documentation including quick start, permissions, collector reference, alert configuration, MCP server setup, and edition comparison
+- [Releases](https://github.com/erikdarlingdata/PerformanceMonitor/releases): Download pre-built binaries
+- [Product page](https://erikdarling.com/free-sql-server-performance-monitoring/): Overview and commercial support options
+
+## Optional
+
+- [Third-party notices](https://github.com/erikdarlingdata/PerformanceMonitor/blob/main/THIRD_PARTY_NOTICES.md): License information for bundled components
+- [License](https://github.com/erikdarlingdata/PerformanceMonitor/blob/main/LICENSE): MIT License