Provide error handling options for health check table dependency

[Copilot]

Responded to review comment asking about alternative approaches for handling "table not found" errors in the database health check endpoint, which currently queries the users table that may not exist before migrations run.

Options provided:

• Query system tables (information_schema.tables) instead of application tables
• Parse error codes to distinguish missing tables (42P01) from connectivity failures
• Use SELECT 1 to test connectivity without table dependencies
• Create dedicated health check table in migrations
• Document migration requirement in existing code

No code changes made - awaiting direction on preferred approach.

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