fix: improve SQLite error handling in metadata.py. Fixes #1220

[ajithhraj]

Addressed Issues:

Fixes #1220

Screenshots/Recordings:

Not applicable.

Additional Notes:

This PR improves SQLite error handling in metadata.py by:

• replacing broad Exception handling with sqlite3.Error
• replacing print() with structured logging
• adding exception handling to db_create_metadata_table()
• preserving the existing db_get_metadata() fallback behavior by returning None on SQLite errors after logging

Verified locally with:

• python -m py_compile backend/app/database/metadata.py

AI Usage Disclosure:

• This PR contains AI-generated code. I have read the AI Usage Policy and this PR complies with this policy. I have tested the code locally and I am responsible for it.

I have used the following AI models and tools: OpenAI Codex (GPT-5)

Checklist

• My PR addresses a single issue, fixes a single bug or makes a single improvement.
• My code follows the project's code style and conventions.
• I have tested my changes locally.
• I have reviewed my code before submitting.

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📒 Files selected for processing (1)

• backend/app/database/metadata.py

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Closing this as unreviewed issue