Fix the sample code of SQLModel

[linyuansup]

1. 'session.exec' overload doesn't match the provided arguments, change to conn.execute
2. sa_type=VECTOR(3) cannot pass pylance check (but it works), change to sa_column=Column(VECTOR(3)) to pass pylance

[Copilot]

🟡 Changes recommended

The README sample needs a Column import to avoid a NameError.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Updates SQLModel README examples for SQLAlchemy execution and Pylance-compatible vector declarations.

Changes:

• Uses conn.execute() within engine.begin().
• Defines the vector field with sa_column=Column(VECTOR(3)).

File summaries

File	Summary	Review note
README.md	Updates SQLModel usage examples.	Add the missing Column import.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Lite

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[ankane]

Hi @linyuansup, the code runs fine. See fastapi/sqlmodel#1657 and fastapi/sqlmodel#1345.