feat: implement neue SRS-Logik zur Berechnung von Intervallen und füge Diagnoseskript für fällige Items hinzu

backend/scripts/diag-srs-stats.js

@@ -0,0 +1,47 @@
+#!/usr/bin/env node
+import { sequelize } from '../utils/sequelize.js';
+
+const run = async () => {
+  try {
+    await sequelize.authenticate();
+    console.log('✅ DB connection OK');
+
+    const queries = {
+      totalDue: `SELECT count(*)::int AS total_due FROM community.vocab_srs_item WHERE next_due_at <= now()`,
+      byStage: `SELECT stage, count(*)::int AS cnt FROM community.vocab_srs_item WHERE next_due_at <= now() GROUP BY stage ORDER BY stage`,
+      perDay30: `SELECT date(next_due_at) AS day, count(*)::int AS cnt FROM community.vocab_srs_item WHERE next_due_at <= now() GROUP BY day ORDER BY day DESC LIMIT 30`,
+      createdToday: `SELECT count(*)::int AS created_today FROM community.vocab_srs_item WHERE date(created_at) = current_date`,
+      recentNextDue: `SELECT item_key, course_id, stage, next_due_at, created_at FROM community.vocab_srs_item WHERE next_due_at > now() - interval '1 day' ORDER BY next_due_at ASC LIMIT 200`
+    };
+
+    const [totalRes] = await sequelize.query(queries.totalDue, { type: sequelize.QueryTypes.SELECT });
+    console.log('\nTotal due items: ', totalRes?.total_due ?? 'N/A');
+
+    const byStage = await sequelize.query(queries.byStage, { type: sequelize.QueryTypes.SELECT });
+    console.log('\nDue by stage:');
+    console.table(byStage);
+
+    const perDay = await sequelize.query(queries.perDay30, { type: sequelize.QueryTypes.SELECT });
+    console.log('\nDue per day (last 30):');
+    console.table(perDay);
+
+    const [createdRes] = await sequelize.query(queries.createdToday, { type: sequelize.QueryTypes.SELECT });
+    console.log('\nCreated today: ', createdRes?.created_today ?? 'N/A');
+
+    const recent = await sequelize.query(queries.recentNextDue, { type: sequelize.QueryTypes.SELECT });
+    console.log('\nExamples of items with next_due_at in the last 24h:');
+    console.table(recent.slice(0, 50));
+
+    // Summary recommendation
+    console.log('\nNotes:');
+    console.log('- If many items are in stage 0/1 and created_today > 0, check code paths that call _ensureSrsItems.');
+    console.log('- If many next_due_at are very recent, items may be created with next_due_at = now() causing large due counts.');
+  } catch (err) {
+    console.error('Error running diagnostics:', err);
+    process.exitCode = 2;
+  } finally {
+    try { await sequelize.close(); } catch (_) {}
+  }
+};
+
+run();

backend/services/vocabService.js

@@ -127,7 +127,6 @@ export default class VocabService {
     const previousInterval = Math.max(0, Number(item?.intervalDays) || 0);
     const normalizedRating = String(rating || '').toLowerCase();
     const isCorrect = Boolean(correct) && normalizedRating !== 'again';
-
     if (!isCorrect) {
       return {
         stage: Math.max(0, previousStage - 1),
@@ -137,25 +136,35 @@ export default class VocabService {
       };
     }
 
-    const intervals = [0, 1, 3, 7, 14, 30, 60, 120, 240];
-    let nextStage = Math.min(intervals.length - 1, previousStage + 1);
-
-    if (normalizedRating === 'hard') {
-      nextStage = Math.max(1, previousStage);
-    }
+    // Neue einfache Policy:
+    // - 'easy'  -> 7 Tage
+    // - 'good'/'normal' -> 4 Tage
+    // - 'hard'  -> 1 Tag
+    // Außerdem: nextDueAt darf nicht mehr am gleichen Kalendertag liegen.
+    let intervalDays;
     if (normalizedRating === 'easy') {
-      nextStage = Math.min(intervals.length - 1, previousStage + 2);
+      intervalDays = 7;
+    } else if (normalizedRating === 'hard') {
+      intervalDays = 1;
+    } else {
+      // default / 'good' / unspecified
+      intervalDays = 4;
     }
 
-    let intervalDays = intervals[nextStage] ?? Math.max(1, previousInterval * 2);
-    if (normalizedRating === 'hard') {
-      intervalDays = Math.max(1, Math.ceil(Math.max(previousInterval, 1) * 1.2));
-    }
+    // Bestimme nextDueAt als Start des Tages (00:00) nach intervalDays
+    const nextDueAt = new Date(now);
+    // Setze auf Mitternacht heute
+    nextDueAt.setHours(0, 0, 0, 0);
+    // Gehe vorwärts: morgen + (intervalDays - 1)
+    nextDueAt.setDate(nextDueAt.getDate() + 1 + Math.max(0, intervalDays - 1));
+
+    // Stage-Logik: einfache Fortschrittsstufe basierend auf intervalDays
+    let nextStage = Math.min(8, Math.max(0, Math.floor(Math.log2(intervalDays + 1))));
 
     return {
       stage: nextStage,
       intervalDays,
-      nextDueAt: new Date(now.getTime() + intervalDays * 24 * 60 * 60 * 1000),
+      nextDueAt,
       lapseDelta: 0
     };
   }