Add SQLite passive income dashboard with Excel import and deployment tools

app/routes/export.py

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+import csv
+import io
+from decimal import Decimal
+from fastapi import APIRouter
+from fastapi.responses import StreamingResponse
+from database import connect
+from models import CATEGORIES
+
+router = APIRouter()
+
+
+def safe_cell(value):
+    text = str(value or '')
+    return "'" + text if text.lstrip().startswith(('=', '+', '-', '@')) or text.startswith(('\t', '\r', '\n')) else text
+
+
+def csv_rows():
+    stream = io.StringIO(newline='')
+    writer = csv.writer(stream, delimiter=';', lineterminator='\r\n')
+    yield '\ufeff'
+    writer.writerow(['Datum', 'Position', 'Kategorie', 'Betrag', 'Notiz', 'Erwartet', 'Erhalten'])
+    yield stream.getvalue()
+    stream.seek(0); stream.truncate(0)
+    with connect() as db:
+        for row in db.execute('SELECT i.*, a.name FROM income_entries i JOIN assets a ON a.id=i.asset_id ORDER BY date DESC, i.id DESC'):
+            writer.writerow([row['date'], safe_cell(row['name']), CATEGORIES[row['category']],
+                             f"{Decimal(row['amount'])/100:.2f}".replace('.', ','), safe_cell(row['note']),
+                             'Ja' if row['expected'] else 'Nein', 'Ja' if row['received'] else 'Nein'])
+            yield stream.getvalue()
+            stream.seek(0); stream.truncate(0)
+
+
+@router.get('/export/income.csv')
+def export():
+    return StreamingResponse(csv_rows(), media_type='text/csv; charset=utf-8', headers={'Content-Disposition': 'attachment; filename="income.csv"'})