no-mistakes(review): Add startup self-heal guard for show_in_form column

app/main.py

@@ -9,6 +9,7 @@ from pathlib import Path
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from fastapi.staticfiles import StaticFiles
+from sqlalchemy import text
 
 from app.core.config import settings
 from app.core.database import Base, async_session_factory, engine
@@ -18,12 +19,24 @@ from app.services.seed import seed_categories, seed_units, seed_users
 logger = logging.getLogger(__name__)
 
 
+async def ensure_legacy_schema(conn) -> None:
+    """Add columns from alembic migrations that legacy create_all databases lack."""
+    result = await conn.execute(text("PRAGMA table_info(categories)"))
+    columns = {row[1] for row in result}
+    if "show_in_form" not in columns:
+        await conn.execute(
+            text("ALTER TABLE categories ADD COLUMN show_in_form BOOLEAN NOT NULL DEFAULT 1")
+        )
+        logger.info("Added missing categories.show_in_form column (legacy database)")
+
+
 @asynccontextmanager
 async def lifespan(app: FastAPI):
     """Initialise database and seed data on startup."""
     logger.info("Starting Denya OneCare …")
     async with engine.begin() as conn:
         await conn.run_sync(Base.metadata.create_all)
+        await ensure_legacy_schema(conn)
     async with async_session_factory() as session:
         await seed_users(session)
         await session.commit()