feat(database): Add Microsoft SQL Server (MSSQL) Integration [Track D]

[david-mamani]

Hackathon Track

Track D: External Tool / Database Integration (3 Points)

Description

Implemented Microsoft SQL Server (MSSQL) support as a memory storage backend for MemU using the mssql+pyodbc driver.

Key Changes

• Added mssql provider to DatabaseConfig and factory logic.
• Created dedicated SQLModel definitions for MSSQL to ensure dialect independence.
• Implemented automatic JSON serialization for embedding vectors to handle SQL Server compatibility.
• Added lazy-loading for pyodbc dependencies with descriptive error handling.

Testing & Quality

• Validated via tests/test_mssql_mock.py using Bunker Mode for isolated database testing.
• Verified schema creation and resource persistence (create_resource).
• Full setup documentation added in docs/mssql_integration.md.

Checklist

• Code follows PEP 8/Ruff standards.
• Unit tests passed.
• Documentation added.

Resolves #164

[Jununn]

Hi, the build for this PR is not passing yet. Please make the necessary updates, and we’ll review again after that. Thanks! @david-mamani