fix: enable AI analysis history and correct pipeline scope

Fixes two critical bugs in AI analysis storage:

1. History now works - analyses are saved, not overwritten
   - Removed DELETE statements before INSERT in insights.py
   - All analyses are now preserved per scope
   - Displayed in descending order by creation date

2. Pipeline saves under correct scope 'pipeline' instead of 'gesamt'
   - Changed scope from 'gesamt' to 'pipeline' in pipeline endpoint
   - Pipeline results now appear under correct category in history

3. Fixed pipeline appearing twice in UI
   - Filter now excludes both 'pipeline_*' and 'pipeline' from individual list
   - Pipeline only appears in dedicated section at top

Changes:
- backend/routers/insights.py: Removed DELETE, changed scope to 'pipeline'
- frontend/src/pages/Analysis.jsx: Fixed filter to exclude 'pipeline'

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/routers/insights.py

@@ -294,10 +294,9 @@ async def analyze_with_prompt(slug: str, x_profile_id: Optional[str]=Header(defa
     else:
         raise HTTPException(500, "Keine KI-API konfiguriert")
 
-    # Save insight
+    # Save insight (with history - no DELETE)
     with get_db() as conn:
         cur = get_cursor(conn)
-        cur.execute("DELETE FROM ai_insights WHERE profile_id=%s AND scope=%s", (pid, slug))
         cur.execute("INSERT INTO ai_insights (id, profile_id, scope, content, created) VALUES (%s,%s,%s,%s,CURRENT_TIMESTAMP)",
             (str(uuid.uuid4()), pid, slug, content))
 
@@ -431,15 +430,14 @@ async def analyze_pipeline(x_profile_id: Optional[str]=Header(default=None), ses
     if goals_text:
         final_content += "\n\n" + goals_text
 
-    # Save as 'gesamt' scope
+    # Save as 'pipeline' scope (with history - no DELETE)
     with get_db() as conn:
         cur = get_cursor(conn)
-        cur.execute("DELETE FROM ai_insights WHERE profile_id=%s AND scope='gesamt'", (pid,))
-        cur.execute("INSERT INTO ai_insights (id, profile_id, scope, content, created) VALUES (%s,%s,'gesamt',%s,CURRENT_TIMESTAMP)",
+        cur.execute("INSERT INTO ai_insights (id, profile_id, scope, content, created) VALUES (%s,%s,'pipeline',%s,CURRENT_TIMESTAMP)",
             (str(uuid.uuid4()), pid, final_content))
 
     inc_ai_usage(pid)
-    return {"scope": "gesamt", "content": final_content, "stage1": stage1_results}
+    return {"scope": "pipeline", "content": final_content, "stage1": stage1_results}
 
 
 @router.get("/ai/usage")

frontend/src/pages/Analysis.jsx

@@ -177,7 +177,7 @@ export default function Analysis() {
     grouped[key].push(ins)
   })
 
-  const activePrompts = prompts.filter(p=>p.active && !p.slug.startsWith('pipeline_'))
+  const activePrompts = prompts.filter(p=>p.active && !p.slug.startsWith('pipeline_') && p.slug !== 'pipeline')
 
   // Pipeline is available if the "pipeline" prompt is active
   const pipelinePrompt = prompts.find(p=>p.slug==='pipeline')