feat: add conditional VACUUM ANALYZE support with thresholds to performance monitor script

scripts/Weekly-Performance-Monitor.ps1

@@ -51,7 +51,18 @@ param (
     [switch]$EmailReport,
 
     [Parameter()]
-    [switch]$CompareWithPrevious
+    [switch]$CompareWithPrevious,
+
+    [Parameter()]
+    [switch]$AutoVacuumAnalyze,
+
+    [Parameter()]
+    [ValidateRange(1, [int]::MaxValue)]
+    [int]$DeadTupleThreshold = 100,
+
+    [Parameter()]
+    [ValidateRange(0.01, 100.0)]
+    [double]$DeadTuplePercentThreshold = 0.02
 )
 
 # ============================================================================
@@ -158,15 +169,15 @@ function Get-IndexUsageStats {
     $query = @"
 SELECT 
     schemaname,
-    tablename,
-    indexname,
+    relname AS tablename,
+    indexrelname,
     idx_scan,
     idx_tup_read,
     idx_tup_fetch,
     pg_size_pretty(pg_relation_size(indexrelid)) AS index_size
 FROM pg_stat_user_indexes
 WHERE schemaname IN ('library', 'users', 'authentication', 'displaypreferences', 'activitylog')
-ORDER BY schemaname, tablename, idx_scan DESC;
+ORDER BY schemaname, relname, idx_scan DESC;
 "@
 
     try {
@@ -193,7 +204,7 @@ function Get-TableSizeStats {
     $query = @"
 SELECT 
     schemaname,
-    relname AS tablename,
+    relname,
     pg_size_pretty(pg_total_relation_size(schemaname||'.'||relname)) AS total_size,
     pg_size_pretty(pg_relation_size(schemaname||'.'||relname)) AS table_size,
     pg_size_pretty(pg_total_relation_size(schemaname||'.'||relname) - pg_relation_size(schemaname||'.'||relname)) AS index_size,
@@ -221,6 +232,67 @@ ORDER BY pg_total_relation_size(schemaname||'.'||relname) DESC;
     }
 }
 
+function Invoke-ConditionalVacuumAnalyze {
+    param(
+        [int]$MinDeadTuples,
+        [double]$MinDeadPercent
+    )
+
+    Write-ColorOutput "`nChecking for tables that need VACUUM ANALYZE..." -Color Cyan
+    Write-ColorOutput "Thresholds: dead tuples >= $MinDeadTuples and dead percent >= $MinDeadPercent" -Color Gray
+
+    $tableQuery = @"
+SELECT
+    format('%I.%I', schemaname, relname) AS qualified_table,
+    n_dead_tup,
+    ROUND(100.0 * n_dead_tup / NULLIF(n_live_tup, 0), 2) AS dead_pct
+FROM pg_stat_user_tables
+WHERE schemaname IN ('library', 'users', 'authentication', 'displaypreferences', 'activitylog')
+  AND n_live_tup > 0
+  AND n_dead_tup >= $MinDeadTuples
+  AND (100.0 * n_dead_tup / NULLIF(n_live_tup, 0)) >= $MinDeadPercent
+ORDER BY n_dead_tup DESC;
+"@
+
+    try {
+        $tables = & $PSQL_PATH -h $DB_HOST -p $DB_PORT -U $DB_USER -d $DB_NAME -t -A -F "|" -c $tableQuery 2>&1
+        if ($LASTEXITCODE -ne 0) {
+            Write-ColorOutput "[ERROR] Failed to evaluate dead tuple thresholds: $tables" -Color Red
+            return $false
+        }
+
+        $tableLines = @($tables | Where-Object { -not [string]::IsNullOrWhiteSpace($_) })
+        if ($tableLines.Count -eq 0) {
+            Write-ColorOutput "[OK] No tables exceeded dead tuple thresholds" -Color Green
+            return $true
+        }
+
+        Write-ColorOutput "Found $($tableLines.Count) table(s) requiring VACUUM ANALYZE" -Color Yellow
+
+        foreach ($line in $tableLines) {
+            $parts = $line -split "\|", 3
+            $qualifiedTable = $parts[0].Trim()
+            $deadTuples = if ($parts.Count -ge 2) { $parts[1].Trim() } else { "unknown" }
+            $deadPercent = if ($parts.Count -ge 3) { $parts[2].Trim() } else { "unknown" }
+
+            Write-ColorOutput "Running VACUUM ANALYZE on $qualifiedTable (dead tuples: $deadTuples, dead percent: $deadPercent)" -Color Cyan
+
+            $vacuumResult = & $PSQL_PATH -h $DB_HOST -p $DB_PORT -U $DB_USER -d $DB_NAME -c "VACUUM (ANALYZE, VERBOSE) $qualifiedTable;" 2>&1
+            if ($LASTEXITCODE -ne 0) {
+                Write-ColorOutput "[ERROR] VACUUM ANALYZE failed for $qualifiedTable : $vacuumResult" -Color Red
+                return $false
+            }
+
+            Write-ColorOutput "[OK] VACUUM ANALYZE completed for $qualifiedTable" -Color Green
+        }
+
+        return $true
+    } catch {
+        Write-ColorOutput "[ERROR] Conditional VACUUM ANALYZE failed: $_" -Color Red
+        return $false
+    }
+}
+
 function Compare-WithPrevious {
     param(
         [string]$CurrentReport,