Refactor database performance diagnostics: Update connection pool diagnostics in diagnose-db-performance.js to improve error handling and enhance console output clarity. This change ensures more accurate user feedback regarding database connection pooling.

backend/check-knowledge-pkey.js

@@ -0,0 +1,130 @@
+#!/usr/bin/env node
+
+/**
+ * Script zur Analyse des knowledge_pkey Problems
+ * 
+ * Prüft warum knowledge_pkey nicht verwendet wird
+ */
+
+import './config/loadEnv.js';
+import { sequelize } from './utils/sequelize.js';
+
+async function main() {
+    try {
+        console.log('🔍 Analyse knowledge_pkey Problem\n');
+        console.log('='.repeat(60) + '\n');
+
+        // Prüfe ob knowledge einen Primary Key hat
+        const [pkInfo] = await sequelize.query(`
+            SELECT 
+                a.attname as column_name,
+                t.conname as constraint_name,
+                t.contype as constraint_type
+            FROM pg_constraint t
+            JOIN pg_class c ON c.oid = t.conrelid
+            JOIN pg_namespace n ON n.oid = c.relnamespace
+            JOIN pg_attribute a ON a.attrelid = c.oid AND a.attnum = ANY(t.conkey)
+            WHERE n.nspname = 'falukant_data'
+            AND c.relname = 'knowledge'
+            AND t.contype = 'p';
+        `);
+
+        console.log('📋 Primary Key Information:');
+        if (pkInfo.length > 0) {
+            pkInfo.forEach(pk => {
+                console.log(`   Constraint: ${pk.constraint_name}`);
+                console.log(`   Spalte: ${pk.column_name}`);
+                console.log(`   Typ: ${pk.constraint_type === 'p' ? 'PRIMARY KEY' : pk.constraint_type}`);
+            });
+        } else {
+            console.log('   ⚠️  Kein Primary Key gefunden!');
+        }
+        console.log('');
+
+        // Prüfe alle Indizes auf knowledge
+        const [allIndexes] = await sequelize.query(`
+            SELECT 
+                indexname,
+                indexdef,
+                idx_scan,
+                idx_tup_read,
+                idx_tup_fetch
+            FROM pg_indexes
+            LEFT JOIN pg_stat_user_indexes 
+                ON pg_stat_user_indexes.indexrelname = pg_indexes.indexname
+                AND pg_stat_user_indexes.schemaname = pg_indexes.schemaname
+            WHERE pg_indexes.schemaname = 'falukant_data'
+            AND pg_indexes.tablename = 'knowledge'
+            ORDER BY indexname;
+        `);
+
+        console.log('📊 Alle Indizes auf knowledge:');
+        allIndexes.forEach(idx => {
+            console.log(`\n   ${idx.indexname}:`);
+            console.log(`      Definition: ${idx.indexdef}`);
+            console.log(`      Scans: ${idx.idx_scan ? parseInt(idx.idx_scan).toLocaleString() : 'N/A'}`);
+            console.log(`      Zeilen gelesen: ${idx.idx_tup_read ? parseInt(idx.idx_tup_read).toLocaleString() : 'N/A'}`);
+        });
+        console.log('');
+
+        // Prüfe Tabellenstruktur
+        const [tableStructure] = await sequelize.query(`
+            SELECT 
+                column_name,
+                data_type,
+                is_nullable,
+                column_default
+            FROM information_schema.columns
+            WHERE table_schema = 'falukant_data'
+            AND table_name = 'knowledge'
+            ORDER BY ordinal_position;
+        `);
+
+        console.log('📋 Tabellenstruktur:');
+        tableStructure.forEach(col => {
+            console.log(`   ${col.column_name}: ${col.data_type} ${col.is_nullable === 'NO' ? 'NOT NULL' : 'NULL'}`);
+        });
+        console.log('');
+
+        // Prüfe ob Queries mit id (Primary Key) gemacht werden
+        const [idUsage] = await sequelize.query(`
+            SELECT 
+                query,
+                calls,
+                total_exec_time,
+                mean_exec_time
+            FROM pg_stat_statements
+            WHERE query LIKE '%knowledge%'
+            AND (query LIKE '%knowledge.id%' OR query LIKE '%knowledge%id%')
+            ORDER BY calls DESC
+            LIMIT 5;
+        `);
+
+        if (idUsage.length > 0) {
+            console.log('🔍 Queries die knowledge.id verwenden:');
+            idUsage.forEach(q => {
+                console.log(`   Aufrufe: ${parseInt(q.calls).toLocaleString()}`);
+                console.log(`   Query: ${q.query.substring(0, 150)}...`);
+                console.log('');
+            });
+        } else {
+            console.log('   ℹ️  Keine Queries gefunden, die knowledge.id verwenden');
+            console.log('   💡 Das erklärt, warum knowledge_pkey nicht verwendet wird\n');
+        }
+
+        await sequelize.close();
+        process.exit(0);
+
+    } catch (error) {
+        if (error.message.includes('pg_stat_statements')) {
+            console.log('   ⚠️  pg_stat_statements ist nicht aktiviert oder nicht verfügbar\n');
+        } else {
+            console.error('❌ Fehler:', error.message);
+            console.error(error.stack);
+        }
+        await sequelize.close();
+        process.exit(1);
+    }
+}
+
+main();