Fix: wurf_rang/wurf_name ALTER TABLE außerhalb executescript (SW by-v912)

backend/database.py

@@ -1353,13 +1353,6 @@ def _migrate(conn_factory):
             );
             CREATE INDEX IF NOT EXISTS idx_litters_breeder ON litters(breeder_id, created_at DESC);
             CREATE INDEX IF NOT EXISTS idx_litters_status  ON litters(status, sichtbar);
-            # wurf_rang + wurf_name Spalten nachrüsten
-            try:
-                conn.execute("ALTER TABLE litters ADD COLUMN wurf_rang TEXT")
-            except Exception: pass
-            try:
-                conn.execute("ALTER TABLE litters ADD COLUMN wurf_name TEXT")
-            except Exception: pass
 
             CREATE TABLE IF NOT EXISTS puppies (
                 id              INTEGER PRIMARY KEY AUTOINCREMENT,
@@ -2339,6 +2332,15 @@ def _migrate(conn_factory):
         except Exception as e:
             logger.warning(f"Migration litter_waitlist: {e}")
 
+        try:
+            conn.execute("ALTER TABLE litters ADD COLUMN wurf_rang TEXT")
+        except Exception:
+            pass
+        try:
+            conn.execute("ALTER TABLE litters ADD COLUMN wurf_name TEXT")
+        except Exception:
+            pass
+
         # route_dogs: bestehende Routen allen Hunden des Users zuweisen
         try:
             existing = conn.execute("SELECT COUNT(*) FROM route_dogs").fetchone()[0]