Amritanshu
38a8656008
Added the menu category delete route. Fix: Show blank vouchers in tables Fix: In rare cases, the old settements can stick around. fixed it.
20 lines
750 B
Markdown
20 lines
750 B
Markdown
---
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name: sqlalchemy-async
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description: Writes SQLAlchemy 2.0 async database queries using Psycopg3. Use whenever interacting with the PostgreSQL database.
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---
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# SQLAlchemy 2.0 Async Standards
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## Model Definitions
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- ALWAYS use SQLAlchemy 2.0 Declarative Base with `Mapped` and `mapped_column`.
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- Example: `id: Mapped[int] = mapped_column(primary_key=True)`
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- NEVER use the old `Column(Integer, primary_key=True)` syntax.
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## Querying
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- NEVER use `session.query()`. This is legacy 1.x syntax.
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- ALWAYS use `sqlalchemy.select()` combined with `await session.execute(stmt)`.
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- Extract results using `.scalars().all()` or `.scalar_one_or_none()`.
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## Session Management
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- Use `sqlalchemy.ext.asyncio.AsyncSession`.
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- Ensure all database I/O is awaited.
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