Implement Comparison Logic for Progression Path Suggestions

- Added `compare_with_assignments` flag to `ProgressionPathSuggestRequest` to enable comparison of proposed paths with existing slot assignments.
- Introduced `_assignment_preservation_active` function to determine if existing assignments should be preserved during path suggestions.
- Enhanced `suggest_progression_path` to handle comparison logic, including validation for minimum slot assignments required for comparison.
- Implemented `_build_progression_compare_response` to structure the response for comparison results, including slot differences and quality scores.
- Updated frontend components to support new comparison features, including handling of slot assignments and optimization comparisons.
- Bumped version to reflect the new features and improvements.

backend/planning_exercise_path_builder.py

@@ -141,6 +141,7 @@ class ProgressionPathSuggestRequest(BaseModel):
     roadmap_notes: Optional[str] = Field(default=None, max_length=2000)
     progression_graph_id: Optional[int] = Field(default=None, ge=1)
     exercise_kind_any: Optional[List[str]] = None
+    compare_with_assignments: bool = False
     planning_catalog_context: Optional[ProgressionPlanningCatalogContext] = None
 
 
@@ -676,6 +677,11 @@ def _slot_assignments_by_major_index(
     return out
 
 
+def _assignment_preservation_active(body: ProgressionPathSuggestRequest) -> bool:
+    """Trainer-Pfad schützen — nur bei explizitem Flag (Frontend entscheidet pro Aktion)."""
+    return bool(body.preserve_slot_assignments)
+
+
 def _path_step_from_slot_assignment(
     cur,
     *,
@@ -1848,11 +1854,33 @@ def _build_steps_roadmap_first(
     if roadmap_ctx.roadmap:
         majors_by_index = {m.index: m for m in roadmap_ctx.roadmap.major_steps}
 
+    preserve_assignments = _assignment_preservation_active(body)
+
     for step_index, stage_spec in enumerate(stage_specs):
         major_idx = stage_spec.major_step_index
         major = majors_by_index.get(major_idx)
         slot_priority_id: Optional[int] = None
 
+        if preserve_assignments and major_idx in assignments:
+            direct = _path_step_from_slot_assignment(
+                cur,
+                assignment=assignments[major_idx],
+                stage_spec=stage_spec,
+                major_step=major,
+                tenant=tenant,
+                progression_graph_id=body.progression_graph_id,
+            )
+            if direct:
+                direct["slot_status"] = "preserved"
+                direct["roadmap_match_source"] = "slot_best_match"
+                steps.append(direct)
+                eid = int(direct["exercise_id"])
+                used.add(eid)
+                planned_ids.append(eid)
+                anchor_id = eid
+                anchor_variant_id = direct.get("variant_id")
+                continue
+
         if major_idx in assignments:
             try:
                 slot_priority_id = int(assignments[major_idx].exercise_id)
@@ -2123,6 +2151,88 @@ def _run_evaluate_only_path_qa(
     }
 
 
+def _path_qa_quality_score(path_qa: Optional[Mapping[str, Any]]) -> Optional[float]:
+    if not path_qa:
+        return None
+    raw = path_qa.get("quality_score")
+    try:
+        return float(raw) if raw is not None else None
+    except (TypeError, ValueError):
+        return None
+
+
+def _steps_by_major_index(steps: Sequence[Mapping[str, Any]]) -> Dict[int, Dict[str, Any]]:
+    out: Dict[int, Dict[str, Any]] = {}
+    for raw in steps or []:
+        if not isinstance(raw, dict):
+            continue
+        midx = raw.get("roadmap_major_step_index")
+        if midx is None:
+            continue
+        try:
+            out[int(midx)] = dict(raw)
+        except (TypeError, ValueError):
+            continue
+    return out
+
+
+def _build_progression_slot_diffs(
+    baseline_steps: Sequence[Mapping[str, Any]],
+    proposed_steps: Sequence[Mapping[str, Any]],
+) -> List[Dict[str, Any]]:
+    """Gegenüberstellung je Roadmap-Slot — nur geänderte oder neu leere Slots."""
+    base_by = _steps_by_major_index(baseline_steps)
+    prop_by = _steps_by_major_index(proposed_steps)
+    diffs: List[Dict[str, Any]] = []
+    for midx in sorted(set(base_by.keys()) | set(prop_by.keys())):
+        base = base_by.get(midx, {})
+        prop = prop_by.get(midx, {})
+        base_id = base.get("exercise_id")
+        prop_id = prop.get("exercise_id")
+        base_title = (base.get("title") or "").strip() or None
+        prop_title = (prop.get("title") or "").strip() or None
+        if base_id is not None and prop_id is not None and int(base_id) == int(prop_id):
+            continue
+        diffs.append(
+            {
+                "roadmap_major_step_index": midx,
+                "baseline_exercise_id": int(base_id) if base_id is not None else None,
+                "baseline_title": base_title,
+                "proposed_exercise_id": int(prop_id) if prop_id is not None else None,
+                "proposed_title": prop_title,
+                "baseline_slot_status": base.get("slot_status"),
+                "proposed_slot_status": prop.get("slot_status"),
+                "changed": base_id != prop_id or base_title != prop_title,
+            }
+        )
+    return diffs
+
+
+def _build_progression_compare_response(
+    baseline: Mapping[str, Any],
+    proposed: Mapping[str, Any],
+) -> Dict[str, Any]:
+    baseline_steps = list(baseline.get("steps") or [])
+    proposed_steps = list(proposed.get("steps") or [])
+    baseline_qa = baseline.get("path_qa") if isinstance(baseline.get("path_qa"), dict) else {}
+    proposed_qa = proposed.get("path_qa") if isinstance(proposed.get("path_qa"), dict) else {}
+    slot_diffs = _build_progression_slot_diffs(baseline_steps, proposed_steps)
+    return {
+        **dict(proposed),
+        "comparison_mode": True,
+        "baseline_steps": baseline_steps,
+        "baseline_path_qa": baseline_qa,
+        "proposed_steps": proposed_steps,
+        "proposed_path_qa": proposed_qa,
+        "slot_diffs": slot_diffs,
+        "slot_diff_count": len(slot_diffs),
+        "baseline_quality_score": _path_qa_quality_score(baseline_qa),
+        "proposed_quality_score": _path_qa_quality_score(proposed_qa),
+        "path_qa": proposed_qa,
+        "steps": proposed_steps,
+    }
+
+
 def suggest_progression_path(
     cur,
     *,
@@ -2133,6 +2243,32 @@ def suggest_progression_path(
     if not _has_planning_role(role):
         raise HTTPException(status_code=403, detail="Nur Trainer dürfen Pfad-Vorschläge abrufen")
 
+    if body.compare_with_assignments:
+        assignments = _slot_assignments_by_major_index(body.slot_assignments)
+        if len(assignments) < 1:
+            raise HTTPException(
+                status_code=400,
+                detail="compare_with_assignments erfordert mindestens ein slot_assignment",
+            )
+        baseline_body = body.model_copy(
+            update={
+                "evaluate_only": True,
+                "evaluate_steps": list(body.slot_assignments or []),
+                "compare_with_assignments": False,
+                "preserve_slot_assignments": True,
+            }
+        )
+        baseline = suggest_progression_path(cur, tenant=tenant, body=baseline_body)
+        proposed_body = body.model_copy(
+            update={
+                "compare_with_assignments": False,
+                "preserve_slot_assignments": False,
+                "evaluate_only": False,
+            }
+        )
+        proposed = suggest_progression_path(cur, tenant=tenant, body=proposed_body)
+        return _build_progression_compare_response(baseline, proposed)
+
     goal_query = _normalize_query(body.query)
     if len(goal_query) < 3:
         raise HTTPException(status_code=400, detail="Ziel-Anfrage: mindestens 3 Zeichen")
@@ -2431,6 +2567,7 @@ def suggest_progression_path(
     reorder_notes: List[str] = []
 
     roadmap_qa_mode: Optional[str] = None
+    preserve_assignments = _assignment_preservation_active(body)
     if body.include_path_qa:
         if roadmap_first:
             roadmap_qa_mode = "roadmap_first_lite"
@@ -2466,7 +2603,9 @@ def suggest_progression_path(
         elif gaps and roadmap_first:
             unfilled_gaps = list(gaps)
 
-        if body.include_llm_path_qa and not roadmap_first:
+        if body.include_llm_path_qa and (
+            not roadmap_first or preserve_assignments
+        ):
             llm_qa, llm_qa_applied = try_llm_qa_progression_path(
                 cur,
                 goal_query=goal_query,
@@ -2497,6 +2636,9 @@ def suggest_progression_path(
             goal_query=goal_query,
         )
         off_topic_before_strip = list(off_topic_steps)
+        if preserve_assignments:
+            stripped_off_topic = []
+        else:
             steps, stripped_off_topic = strip_off_topic_steps_from_path(
                 steps,
                 off_topic_steps,
@@ -2511,7 +2653,7 @@ def suggest_progression_path(
                 roadmap_first=roadmap_first,
             )
 
-        if roadmap_first and roadmap_ctx is not None:
+        if roadmap_first and roadmap_ctx is not None and not preserve_assignments:
             (
                 steps,
                 rematch_log,
@@ -2545,7 +2687,7 @@ def suggest_progression_path(
                     roadmap_first=roadmap_first,
                 )
 
-        if body.include_llm_path_qa and roadmap_first:
+        if body.include_llm_path_qa and roadmap_first and not preserve_assignments:
             gaps = detect_path_gaps(
                 cur,
                 steps,
@@ -2656,6 +2798,8 @@ def suggest_progression_path(
         path_qa["refine_applied"] = True
         path_qa["refine_log"] = refine_log
         path_qa["refine_count"] = len(refine_log)
+    if preserve_assignments:
+        path_qa["assignments_preserved"] = True
 
     filled_library_steps = sum(1 for s in steps if s.get("exercise_id") is not None)
     match_summary = {

backend/tests/test_planning_assignment_preservation.py

@@ -0,0 +1,31 @@
+"""Tests Trainer-Pfad-Schutz (preserve_slot_assignments)."""
+from planning_exercise_path_builder import (
+    EvaluateStepPayload,
+    ProgressionPathSuggestRequest,
+    _assignment_preservation_active,
+)
+
+
+def test_assignment_preservation_explicit_flag():
+    body = ProgressionPathSuggestRequest(
+        query="Kumite Beinarbeit Progression",
+        preserve_slot_assignments=True,
+    )
+    assert _assignment_preservation_active(body)
+
+
+def test_assignment_preservation_not_auto_from_slot_assignments():
+    """Nur explizites preserve_slot_assignments — sonst wäre compare/match blockiert."""
+    body = ProgressionPathSuggestRequest(
+        query="Kumite Beinarbeit Progression",
+        slot_assignments=[
+            EvaluateStepPayload(exercise_id=10, roadmap_major_step_index=0),
+            EvaluateStepPayload(exercise_id=11, roadmap_major_step_index=1),
+        ],
+    )
+    assert not _assignment_preservation_active(body)
+
+
+def test_assignment_preservation_inactive_without_assignments():
+    body = ProgressionPathSuggestRequest(query="Kumite Beinarbeit Progression")
+    assert not _assignment_preservation_active(body)

frontend/src/components/ExerciseProgressionPathBuilder.jsx

@@ -16,6 +16,9 @@ import {
   pathQaShowsStrongResult,
   setCatalogSelectItems,
   splitPathQaHints,
+  draftHasLibrarySlotAssignments,
+  slotsToSlotAssignments,
+  draftRetrievalBoostExerciseIds,
 } from '../utils/progressionGraphDraft'
 import {
   aiPreviewToQuickCreateDraft,
@@ -1245,6 +1248,22 @@ export default function ExerciseProgressionPathBuilder({
     setError('')
     try {
       const override = majorStepsToOverridePayload(validSteps)
+      const preserveAssignments = draftHasLibrarySlotAssignments({
+        slots: validSteps.map((s, i) => ({
+          majorStepIndex: i,
+          phase: s.phase,
+          learning_goal: s.learning_goal,
+          primary:
+            pathSteps[i]?.exerciseId != null
+              ? {
+                  kind: 'library',
+                  exerciseId: pathSteps[i].exerciseId,
+                  exerciseTitle: pathSteps[i].exerciseTitle,
+                  variantId: pathSteps[i].variantId,
+                }
+              : { kind: 'empty' },
+        })),
+      })
       const res = await api.suggestProgressionPath({
         query: q,
         max_steps: validSteps.length,
@@ -1257,6 +1276,21 @@ export default function ExerciseProgressionPathBuilder({
         include_llm_roadmap: false,
         roadmap_first: true,
         roadmap_override: override,
+        preserve_slot_assignments: preserveAssignments,
+        slot_assignments: pathSteps
+          .map((row, i) => {
+            if (row.exerciseId == null) return null
+            return {
+              exercise_id: row.exerciseId,
+              variant_id: row.variantId || null,
+              title: row.exerciseTitle || null,
+              is_ai_proposal: false,
+              roadmap_major_step_index: i,
+              roadmap_phase: validSteps[i]?.phase || null,
+              roadmap_learning_goal: validSteps[i]?.learning_goal || null,
+            }
+          })
+          .filter(Boolean),
         progression_graph_id: Number(graphId),
         ...roadmapStructuredPayload(startSituation, targetState, roadmapNotes),
         ...catalogApiPayload,

frontend/src/components/ProgressionFindingsPanel.jsx

@@ -162,6 +162,9 @@ export default function ProgressionFindingsPanel({
   onInsertGapSlot,
   onGenerateGapAi,
   onRematchSlots = null,
+  onOptimizeCompare = null,
+  canOptimizeCompare = false,
+  optimizeCompareBusy = false,
   rematchBusy = false,
   generatingOfferId = null,
   aiBusy = false,
@@ -174,6 +177,9 @@ export default function ProgressionFindingsPanel({
   const rematchLog = Array.isArray(pathQa?.rematch_log) ? pathQa.rematch_log : []
   const refineLog = Array.isArray(pathQa?.refine_log) ? pathQa.refine_log : []
   const showRematchAction = hasRematchSlotHints(pathQa) && typeof onRematchSlots === 'function'
+  const showOptimizeCompare =
+    typeof onOptimizeCompare === 'function'
+    && (canOptimizeCompare || pathQa?.assignments_preserved || showRematchAction)
   const qualityPct = pathQaQualityPercent(pathQa)
   const strongResult = pathQaShowsStrongResult(pathQa)
 
@@ -214,6 +220,12 @@ export default function ProgressionFindingsPanel({
             Pfad-QS: {pathQa.overall_ok ? 'OK' : 'Hinweise'}
             {qualityPct != null ? ` (${qualityPct} %)` : ''}
           </strong>
+          {pathQa.assignments_preserved ? (
+            <p style={{ margin: '6px 0 0', color: 'var(--text2)', fontSize: '11px' }}>
+              Bestehende Slot-Zuordnungen beibehalten — QS wie „Graph bewerten“, ohne Auto-Rematch.
+              {showOptimizeCompare ? ' „Übungen matchen“ oder „Optimierung vergleichen“ prüft Alternativen.' : ''}
+            </p>
+          ) : null}
           {strongResult ? (
             <p style={{ margin: '6px 0 0', color: 'var(--accent-dark)', fontWeight: 600 }}>
               Starker Pfad — KI-Empfehlungen unten können Feinschliff oder optionale Vertiefung sein.
@@ -350,7 +362,18 @@ export default function ProgressionFindingsPanel({
                   )
                 })}
               </ul>
-              {showRematchAction ? (
+              {showOptimizeCompare ? (
+                <button
+                  type="button"
+                  className="btn btn-primary btn-full"
+                  style={{ marginTop: '8px', fontSize: '12px' }}
+                  disabled={optimizeCompareBusy || evaluateDisabled}
+                  onClick={onOptimizeCompare}
+                >
+                  {optimizeCompareBusy ? 'Vergleich läuft…' : 'Optimierung vergleichen'}
+                </button>
+              ) : null}
+              {showRematchAction && !showOptimizeCompare ? (
                 <button
                   type="button"
                   className="btn btn-secondary btn-full"

frontend/src/components/ProgressionGraphEditor.jsx

@@ -22,11 +22,17 @@ import {
   initialStageLearningGoalFromOffer,
 } from '../utils/planningContextForExerciseAi'
 import ExerciseAiSuggestPreviewModal from './ExerciseAiSuggestPreviewModal'
+import ProgressionOptimizeCompareModal from './ProgressionOptimizeCompareModal'
 import {
   addSlotToDraft,
   applyEvaluateResponseToDraft,
   applyGapOfferToDraft,
   applyMatchResponseToDraft,
+  applySelectedCompareSteps,
+  compareResponseHasCuratedSlotChanges,
+  compareResponseHasSlotChanges,
+  curatedSlotDiffs,
+  pathQaQualityPercent,
   applyResolvedStructuredToDraft,
   buildPlanningArtifactFromDraft,
   hydrateProgressionGraphDraft,
@@ -43,6 +49,7 @@ import {
   slotsAsPathStepRows,
   slotsToEvaluateSteps,
   draftRetrievalBoostExerciseIds,
+  draftHasLibrarySlotAssignments,
   slotsToSlotAssignments,
   syncProgressionRoadmapFromSlots,
   syncSlotPhasesFromRoadmap,
@@ -111,6 +118,10 @@ export default function ProgressionGraphEditor({ graphId, embedded = false, onSa
   const [slotQuickSaving, setSlotQuickSaving] = useState(false)
   const [slotQuickError, setSlotQuickError] = useState('')
   const [activePlanningContextLines, setActivePlanningContextLines] = useState([])
+  const [compareOpen, setCompareOpen] = useState(false)
+  const [comparePayload, setComparePayload] = useState(null)
+  const [comparing, setComparing] = useState(false)
+  const [compareApplying, setCompareApplying] = useState(false)
 
   const loadGraph = useCallback(async () => {
     if (!graphId) return
@@ -424,6 +435,76 @@ export default function ProgressionGraphEditor({ graphId, embedded = false, onSa
     }
   }
 
+  const buildMatchRequestBase = (synced) => {
+    const override = majorStepsToOverridePayload(synced.slots)
+    return {
+      query: (synced.goalQuery || '').trim(),
+      max_steps: synced.slots.length,
+      include_llm_intent: true,
+      include_path_qa: true,
+      include_llm_path_qa: true,
+      include_path_reorder: false,
+      include_ai_gap_fill: true,
+      include_roadmap_preview: true,
+      include_llm_roadmap: false,
+      roadmap_first: true,
+      roadmap_override: override,
+      slot_assignments: slotsToSlotAssignments(synced),
+      retrieval_boost_exercise_ids: draftRetrievalBoostExerciseIds(synced),
+      progression_graph_id: Number(graphId),
+      ...roadmapStructuredPayload(synced.startSituation, synced.targetState, synced.roadmapNotes),
+      ...catalogApiPayload,
+    }
+  }
+
+  const fetchOptimizeCompare = async (synced) => {
+    const res = await api.suggestProgressionPath({
+      ...buildMatchRequestBase(synced),
+      preserve_slot_assignments: false,
+      compare_with_assignments: true,
+    })
+    if (!res?.comparison_mode) {
+      throw new Error('Kein Vergleich in der Antwort')
+    }
+    return res
+  }
+
+  const presentOptimizeCompare = (res, { source = 'manual' } = {}) => {
+    setSemanticBrief(res?.semantic_brief_summary || null)
+    setTargetSummary(res?.target_profile_summary || null)
+    const baselineQa = res?.baseline_path_qa || null
+    const proposedQa = res?.proposed_path_qa || res?.path_qa || null
+    setPathQa(baselineQa)
+
+    const openCompareDialog = (diffCount, noticePrefix) => {
+      setComparePayload(res)
+      setCompareOpen(true)
+      const bPct = pathQaQualityPercent(baselineQa)
+      const pPct = pathQaQualityPercent(proposedQa)
+      let notice = `${noticePrefix}${diffCount} Slot-Anpassung(en) — Vergleichsdialog geöffnet.`
+      if (bPct != null && pPct != null && pPct !== bPct) {
+        notice += ` QS ${bPct} % → ${pPct} %.`
+      }
+      setMatchNotice(notice)
+    }
+
+    if (source === 'match') {
+      if (compareResponseHasCuratedSlotChanges(res)) {
+        openCompareDialog(curatedSlotDiffs(res).length, 'KI schlägt ')
+        return { opened: true, res }
+      }
+      return { opened: false, res }
+    }
+
+    setComparePayload(res)
+    setCompareOpen(true)
+    if (compareResponseHasSlotChanges(res)) {
+      const diffCount = res.slot_diff_count ?? res.slot_diffs?.length ?? 0
+      openCompareDialog(diffCount, 'KI schlägt ')
+    }
+    return { opened: true, res }
+  }
+
   const runMatch = async () => {
     const q = (draft?.goalQuery || '').trim()
     if (q.length < 3) {
@@ -439,24 +520,46 @@ export default function ProgressionGraphEditor({ graphId, embedded = false, onSa
     setMatchNotice('')
     try {
       const synced = syncProgressionRoadmapFromSlots(draft)
-      const override = majorStepsToOverridePayload(synced.slots)
+      const hasAssignments = draftHasLibrarySlotAssignments(synced)
+
+      if (hasAssignments) {
+        const res = await fetchOptimizeCompare(synced)
+        const { opened, res: compareRes } = presentOptimizeCompare(res, { source: 'match' })
+        if (opened) return
+
+        const { draft: matched, remainingOffers } = applyMatchResponseToDraft(
+          {
+            ...synced,
+            progressionRoadmap: compareRes?.progression_roadmap || synced.progressionRoadmap,
+            pathSkillExpectations:
+              compareRes?.path_skill_expectations || synced.pathSkillExpectations,
+          },
+          compareRes,
+        )
+        setDraft(matched)
+        setPathQa(compareRes?.proposed_path_qa || compareRes?.path_qa || null)
+        setGapFillOffers(remainingOffers)
+        const ms = compareRes?.match_summary
+        if (ms) {
+          setMatchNotice(
+            `Match: ${ms.library_matches ?? 0}/${ms.slot_count ?? '?'} Slots aus Bibliothek, ${ms.gap_fill_offer_count ?? 0} KI-Angebote. Bestehende Zuordnungen unverändert.`,
+          )
+        }
+        try {
+          await saveProgressionGraphDraft(api, graphId, {
+            ...matched,
+            lastFindings: compareRes?.proposed_path_qa || compareRes?.path_qa || null,
+          })
+          setDraft((prev) => (prev ? { ...prev, dirty: false } : prev))
+        } catch (saveErr) {
+          console.warn('Match-Artefakt konnte nicht gespeichert werden', saveErr)
+        }
+        return
+      }
+
       const res = await api.suggestProgressionPath({
-        query: q,
+        ...buildMatchRequestBase(synced),
-        max_steps: synced.slots.length,
+        preserve_slot_assignments: false,
-        include_llm_intent: true,
-        include_path_qa: true,
-        include_llm_path_qa: true,
-        include_path_reorder: false,
-        include_ai_gap_fill: true,
-        include_roadmap_preview: true,
-        include_llm_roadmap: false,
-        roadmap_first: true,
-        roadmap_override: override,
-        slot_assignments: slotsToSlotAssignments(synced),
-        retrieval_boost_exercise_ids: draftRetrievalBoostExerciseIds(synced),
-        progression_graph_id: Number(graphId),
-        ...roadmapStructuredPayload(draft.startSituation, draft.targetState, draft.roadmapNotes),
-        ...catalogApiPayload,
       })
       const { draft: matched, remainingOffers } = applyMatchResponseToDraft(
         {
@@ -505,6 +608,58 @@ export default function ProgressionGraphEditor({ graphId, embedded = false, onSa
     }
   }
 
+  const runOptimizeCompare = async () => {
+    const q = (draft?.goalQuery || '').trim()
+    if (q.length < 3) {
+      alert('Ziel-Anfrage: mindestens 3 Zeichen.')
+      return
+    }
+    if (!draftHasLibrarySlotAssignments(draft)) {
+      alert('Mindestens ein Slot mit Bibliotheks-Übung nötig für einen Vergleich.')
+      return
+    }
+    setComparing(true)
+    setActionErr('')
+    setMatchNotice('')
+    try {
+      const synced = syncProgressionRoadmapFromSlots(draft)
+      const res = await fetchOptimizeCompare(synced)
+      presentOptimizeCompare(res, { source: 'manual' })
+    } catch (e) {
+      setActionErr(e.message || 'Optimierungs-Vergleich fehlgeschlagen')
+    } finally {
+      setComparing(false)
+    }
+  }
+
+  const applyOptimizeCompare = async (selectedMajorIndices) => {
+    if (!comparePayload || !draft) return
+    setCompareApplying(true)
+    try {
+      const synced = syncProgressionRoadmapFromSlots(draft)
+      const nextDraft = applySelectedCompareSteps(
+        synced,
+        comparePayload.proposed_steps || comparePayload.steps,
+        selectedMajorIndices,
+      )
+      const proposedQa = comparePayload.proposed_path_qa || comparePayload.path_qa
+      setDraft({ ...nextDraft, lastFindings: proposedQa || null })
+      setPathQa(proposedQa || null)
+      setCompareOpen(false)
+      setComparePayload(null)
+      setMatchNotice('Ausgewählte Optimierungen übernommen.')
+      await saveProgressionGraphDraft(api, graphId, {
+        ...nextDraft,
+        lastFindings: proposedQa || null,
+      })
+      setDraft((prev) => (prev ? { ...prev, dirty: false } : prev))
+    } catch (e) {
+      setActionErr(e.message || 'Übernahme fehlgeschlagen')
+    } finally {
+      setCompareApplying(false)
+    }
+  }
+
   const runEvaluate = async () => {
     const q = (draft?.goalQuery || '').trim()
     if (q.length < 3) {
@@ -951,9 +1106,25 @@ export default function ProgressionGraphEditor({ graphId, embedded = false, onSa
                 className="btn btn-secondary"
                 disabled={busy || matching}
                 onClick={runMatch}
+                title={
+                  draftHasLibrarySlotAssignments(draft)
+                    ? 'Voller Match mit Auto-Optimierung — bei Abweichungen öffnet sich der Vergleichsdialog'
+                    : 'Bibliotheks-Übungen für leere Slots finden'
+                }
               >
                 {matching ? 'Match…' : 'Übungen matchen'}
               </button>
+              {draftHasLibrarySlotAssignments(draft) ? (
+                <button
+                  type="button"
+                  className="btn btn-secondary"
+                  disabled={busy || comparing || matching}
+                  onClick={runOptimizeCompare}
+                  title="Aktuellen Pfad vs. voller Match mit Auto-Optimierung — du wählst pro Slot"
+                >
+                  {comparing ? 'Vergleich…' : 'Optimierung vergleichen'}
+                </button>
+              ) : null}
               <button type="button" className="btn btn-primary" disabled={busy} onClick={handleSave}>
                 {busy ? 'Speichern…' : 'Graph speichern'}
               </button>
@@ -1015,6 +1186,9 @@ export default function ProgressionGraphEditor({ graphId, embedded = false, onSa
           onInsertGapSlot={handleInsertGapSlot}
           onGenerateGapAi={openGapFillPrep}
           onRematchSlots={runMatch}
+          onOptimizeCompare={runOptimizeCompare}
+          canOptimizeCompare={draftHasLibrarySlotAssignments(draft)}
+          optimizeCompareBusy={comparing}
           rematchBusy={matching}
           generatingOfferId={generatingOfferId}
           aiBusy={gapAiBusy}
@@ -1054,6 +1228,18 @@ export default function ProgressionGraphEditor({ graphId, embedded = false, onSa
         zIndex={2100}
       />
 
+      <ProgressionOptimizeCompareModal
+        open={compareOpen}
+        comparison={comparePayload}
+        onClose={() => {
+          if (compareApplying) return
+          setCompareOpen(false)
+          setComparePayload(null)
+        }}
+        onApplySelected={applyOptimizeCompare}
+        applying={compareApplying}
+      />
+
       <ExerciseGapFillPrepModal
         open={gapPrepOpen}
         offer={activeOffer}

frontend/src/components/ProgressionOptimizeCompareModal.jsx

@@ -0,0 +1,202 @@
+/**
+ * Gegenüberstellung: bestehender Pfad vs. optimierter Match-Vorschlag.
+ */
+import React, { useMemo, useState } from 'react'
+import { pathQaQualityPercent } from '../utils/progressionGraphDraft'
+
+function qaLabel(pathQa) {
+  const pct = pathQaQualityPercent(pathQa)
+  const ok = pathQa?.overall_ok
+  if (pct != null) return `${ok ? 'OK' : 'Hinweise'} (${pct} %)`
+  return ok ? 'OK' : 'Hinweise'
+}
+
+export default function ProgressionOptimizeCompareModal({
+  open,
+  comparison,
+  onClose,
+  onApplySelected,
+  applying = false,
+}) {
+  const slotDiffs = Array.isArray(comparison?.slot_diffs) ? comparison.slot_diffs : []
+  const [selected, setSelected] = useState(() => new Set())
+
+  const allKeys = useMemo(
+    () => slotDiffs.map((d) => Number(d.roadmap_major_step_index)),
+    [slotDiffs],
+  )
+
+  React.useEffect(() => {
+    if (!open) return
+    setSelected(new Set(allKeys))
+  }, [open, allKeys])
+
+  if (!open || !comparison) return null
+
+  const baselineQa = comparison.baseline_path_qa
+  const proposedQa = comparison.proposed_path_qa || comparison.path_qa
+  const baselinePct = pathQaQualityPercent(baselineQa)
+  const proposedPct = pathQaQualityPercent(proposedQa)
+
+  const toggle = (midx) => {
+    setSelected((prev) => {
+      const next = new Set(prev)
+      if (next.has(midx)) next.delete(midx)
+      else next.add(midx)
+      return next
+    })
+  }
+
+  const toggleAll = (on) => {
+    setSelected(on ? new Set(allKeys) : new Set())
+  }
+
+  return (
+    <div
+      className="modal-overlay"
+      role="dialog"
+      aria-modal="true"
+      aria-labelledby="optimize-compare-title"
+      onClick={(e) => {
+        if (e.target === e.currentTarget && !applying) onClose()
+      }}
+    >
+      <div
+        className="card modal-content"
+        style={{ maxWidth: '720px', width: '100%', maxHeight: '90vh', overflow: 'auto' }}
+        onClick={(e) => e.stopPropagation()}
+      >
+        <h3 id="optimize-compare-title" style={{ marginTop: 0 }}>
+          Optimierung vergleichen
+        </h3>
+        <p style={{ fontSize: '12px', color: 'var(--text3)', marginTop: 0, lineHeight: 1.45 }}>
+          Links dein aktueller Pfad, rechts der Vorschlag nach vollem Match inkl. Auto-Optimierung.
+          Wähle die Slots, die du übernehmen möchtest.
+        </p>
+
+        <div
+          style={{
+            display: 'grid',
+            gridTemplateColumns: '1fr 1fr',
+            gap: '12px',
+            marginBottom: '14px',
+          }}
+        >
+          <div
+            style={{
+              padding: '10px 12px',
+              borderRadius: '8px',
+              border: '1px solid var(--border)',
+              background: 'var(--surface2)',
+              fontSize: '12px',
+            }}
+          >
+            <strong>Aktuell</strong>
+            <div style={{ marginTop: '6px' }}>{qaLabel(baselineQa)}</div>
+            {baselineQa?.topic_coverage ? (
+              <p style={{ margin: '6px 0 0', color: 'var(--text2)' }}>{baselineQa.topic_coverage}</p>
+            ) : null}
+          </div>
+          <div
+            style={{
+              padding: '10px 12px',
+              borderRadius: '8px',
+              border: '1px solid color-mix(in srgb, var(--accent) 35%, var(--border))',
+              background: 'color-mix(in srgb, var(--accent) 8%, var(--surface2))',
+              fontSize: '12px',
+            }}
+          >
+            <strong>Vorschlag (Match + Optimierung)</strong>
+            <div style={{ marginTop: '6px' }}>{qaLabel(proposedQa)}</div>
+            {proposedPct != null && baselinePct != null && proposedPct !== baselinePct ? (
+              <p style={{ margin: '6px 0 0', color: 'var(--text2)' }}>
+                Δ {proposedPct - baselinePct > 0 ? '+' : ''}
+                {proposedPct - baselinePct} Prozentpunkte
+              </p>
+            ) : null}
+            {proposedQa?.topic_coverage ? (
+              <p style={{ margin: '6px 0 0', color: 'var(--text2)' }}>{proposedQa.topic_coverage}</p>
+            ) : null}
+          </div>
+        </div>
+
+        {slotDiffs.length === 0 ? (
+          <p style={{ fontSize: '12px', color: 'var(--text2)' }}>
+            Keine abweichenden Slot-Zuordnungen — der optimierte Lauf liefert denselben Pfad.
+          </p>
+        ) : (
+          <>
+            <div style={{ display: 'flex', gap: '8px', marginBottom: '8px', flexWrap: 'wrap' }}>
+              <button type="button" className="btn btn-secondary" style={{ fontSize: '11px' }} onClick={() => toggleAll(true)}>
+                Alle wählen
+              </button>
+              <button type="button" className="btn btn-secondary" style={{ fontSize: '11px' }} onClick={() => toggleAll(false)}>
+                Keine
+              </button>
+            </div>
+            <ul style={{ listStyle: 'none', padding: 0, margin: 0, display: 'flex', flexDirection: 'column', gap: '8px' }}>
+              {slotDiffs.map((diff) => {
+                const midx = Number(diff.roadmap_major_step_index)
+                const checked = selected.has(midx)
+                return (
+                  <li
+                    key={`diff-${midx}`}
+                    style={{
+                      padding: '10px 12px',
+                      borderRadius: '8px',
+                      border: '1px solid var(--border)',
+                      background: checked ? 'var(--surface2)' : 'var(--surface)',
+                      fontSize: '12px',
+                    }}
+                  >
+                    <label style={{ display: 'flex', gap: '8px', alignItems: 'flex-start', cursor: 'pointer' }}>
+                      <input
+                        type="checkbox"
+                        checked={checked}
+                        onChange={() => toggle(midx)}
+                        disabled={applying}
+                        style={{ marginTop: '3px' }}
+                      />
+                      <span style={{ flex: 1 }}>
+                        <strong>Slot {midx + 1}</strong>
+                        <div
+                          style={{
+                            display: 'grid',
+                            gridTemplateColumns: '1fr 1fr',
+                            gap: '8px',
+                            marginTop: '6px',
+                          }}
+                        >
+                          <span style={{ color: 'var(--text2)' }}>
+                            Bisher: {diff.baseline_title || '— leer —'}
+                          </span>
+                          <span style={{ color: 'var(--accent-dark)' }}>
+                            Neu: {diff.proposed_title || '— leer —'}
+                          </span>
+                        </div>
+                      </span>
+                    </label>
+                  </li>
+                )
+              })}
+            </ul>
+          </>
+        )}
+
+        <div style={{ display: 'flex', flexWrap: 'wrap', gap: '8px', marginTop: '16px', justifyContent: 'flex-end' }}>
+          <button type="button" className="btn btn-secondary" disabled={applying} onClick={onClose}>
+            Abbrechen
+          </button>
+          <button
+            type="button"
+            className="btn btn-primary"
+            disabled={applying || selected.size === 0 || slotDiffs.length === 0}
+            onClick={() => onApplySelected([...selected])}
+          >
+            {applying ? 'Übernehmen …' : `Auswahl übernehmen (${selected.size})`}
+          </button>
+        </div>
+      </div>
+    </div>
+  )
+}

frontend/src/utils/progressionGraphDraft.js

@@ -906,6 +906,23 @@ export function slotsToSlotAssignments(draft) {
     }))
 }
 
+/** Mindestens ein Bibliotheks-Slot belegt → kuratierter Stand, Match prüft Abweichungen. */
+export function draftHasLibrarySlotAssignments(draft) {
+  return slotsToSlotAssignments(draft).length >= 1
+}
+
+/** Diff-Einträge nur für Slots, die vorher schon eine Bibliotheks-Übung hatten. */
+export function curatedSlotDiffs(comparison) {
+  const diffs = comparison?.slot_diffs
+  if (!Array.isArray(diffs)) return []
+  return diffs.filter((d) => d?.baseline_exercise_id != null)
+}
+
+/** Vergleich würde eine bestehende Zuordnung ändern (Dialog bei Match). */
+export function compareResponseHasCuratedSlotChanges(res) {
+  return curatedSlotDiffs(res).length > 0
+}
+
 /** Alle Graph-Übungs-IDs für Retriever-Boost (Slots + Geschwister + gespeichertes Artefakt). */
 export function draftRetrievalBoostExerciseIds(draft) {
   const ids = new Set()
@@ -1046,6 +1063,38 @@ export function applyMatchStepsToSlots(draft, apiSteps) {
   return syncProgressionRoadmapFromSlots({ ...draft, slots: nextSlots, dirty: true })
 }
 
+/** Vergleichs-Antwort: mindestens ein Slot mit anderer Übung als im Ist-Stand. */
+export function compareResponseHasSlotChanges(res) {
+  const count = res?.slot_diff_count ?? res?.slot_diffs?.length ?? 0
+  return Number(count) > 0
+}
+
+/** Nur ausgewählte Slots aus Optimierungs-Vorschlag übernehmen. */
+export function applySelectedCompareSteps(draft, proposedSteps, selectedMajorIndices) {
+  const selected = new Set(
+    (selectedMajorIndices || [])
+      .map((x) => Number(x))
+      .filter((x) => Number.isFinite(x)),
+  )
+  if (!selected.size) return draft
+  const stepByMajor = new Map()
+  for (const step of proposedSteps || []) {
+    if (step?.roadmap_major_step_index == null) continue
+    stepByMajor.set(Number(step.roadmap_major_step_index), step)
+  }
+  const nextSlots = (draft.slots || []).map((slot) => {
+    const midx = Number(slot.majorStepIndex)
+    if (!selected.has(midx)) {
+      return { ...slot, primary: { ...slot.primary }, siblings: [...(slot.siblings || [])] }
+    }
+    const step = stepByMajor.get(midx)
+    if (!step) return slot
+    const patched = applyMatchStepsToSlots({ ...draft, slots: [slot] }, [step])
+    return patched.slots[0]
+  })
+  return syncProgressionRoadmapFromSlots({ ...draft, slots: nextSlots, dirty: true })
+}
+
 /** Lücken-Angebote in leere Slots legen; Panel nur für verbleibende Lücken. */
 export function applyGapOffersFromResponse(draft, res, { replaceOffTopicSlots = false } = {}) {
   let next = draft