fix: add server_default to script_template columns, refresh fork_point after commit

- script_template.py: add server_default for requires_elevation,
  is_gallery_featured, gallery_sort_order so Base.metadata.create_all
  emits proper SQL DEFAULTs (test fixtures use raw SQL INSERT)
- session_branches.py: refresh fork_point after commit so JSONB options
  field is loaded before Pydantic serialization
- test_session_branches_api.py: add status assertion on fork response

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

backend/app/api/endpoints/session_branches.py

@@ -127,6 +127,7 @@ async def create_fork(
     )
 
     await db.commit()
+    await db.refresh(fork_point)
     return ForkPointResponse.model_validate(fork_point)
 
 

backend/app/models/script_template.py

@@ -1,7 +1,7 @@
 import uuid
 from datetime import datetime, timezone
 from typing import Optional, TYPE_CHECKING
-from sqlalchemy import String, Text, DateTime, ForeignKey, Boolean, Integer, Enum as SAEnum
+from sqlalchemy import String, Text, DateTime, ForeignKey, Boolean, Integer, Enum as SAEnum, text
 from sqlalchemy.orm import Mapped, mapped_column, relationship
 from sqlalchemy.dialects.postgresql import UUID, JSONB
 from app.core.database import Base
@@ -64,13 +64,13 @@ class ScriptTemplate(Base):
         SAEnum("beginner", "intermediate", "advanced", name="script_complexity"), nullable=False, default="beginner"
     )
     estimated_runtime: Mapped[Optional[str]] = mapped_column(String(50), nullable=True)
-    requires_elevation: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
+    requires_elevation: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default=text("false"))
     requires_modules: Mapped[list] = mapped_column(JSONB, nullable=False, default=list)
     version: Mapped[int] = mapped_column(Integer, nullable=False, default=1)
     is_verified: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False)
     is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
-    is_gallery_featured: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, index=True)
-    gallery_sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    is_gallery_featured: Mapped[bool] = mapped_column(Boolean, nullable=False, default=False, server_default=text("false"), index=True)
+    gallery_sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0, server_default=text("0"))
     usage_count: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), default=lambda: datetime.now(timezone.utc)

backend/tests/test_session_branches_api.py

@@ -106,6 +106,7 @@ async def test_switch_branch(client: AsyncClient, test_user, auth_headers, test_
             ],
         },
     )
+    assert fork_resp.status_code == 201, fork_resp.text
     fork_data = fork_resp.json()
     branch_b_id = fork_data["options"][1]["branch_id"]