fix(backend): Make sure all the obtained DB connections are able to query

[majdyz]

Changes 🏗️

We've seen some symptoms where during the initial startup of the application the obtained db connection produces an error when the network is unreachable. This code made sure that the obtained connection could run the query and retry it on the spot if it was unable to do so.

Checklist 📋

For code changes:

• I have clearly listed my changes in the PR description
• I have made a test plan
• I have tested my changes according to the test plan:
  • ...

Example test plan

• Create from scratch and execute an agent with at least 3 blocks
• Import an agent from file upload, and confirm it executes correctly
• Upload agent to marketplace
• Import an agent from marketplace and confirm it executes correctly
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For configuration changes:

• .env.example is updated or already compatible with my changes
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Examples of configuration changes

• Changing ports
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• Secrets or environment variable changes
• New or infrastructure changes such as databases

[qodo-merge-pro]

PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Error Handling The error handling could be more specific - currently both connection failures and query failures raise the same generic error message. Consider providing more context in the error message to distinguish between connection vs query failures.

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