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Title

Body Context: I continued to see socket connection errors even with the `production` environment confirmed. The `DATABASE_URL` environment variable itself was missing from the Web Service configuration. Cause: The Render PostgreSQL database service was not automatically linked to the Web Service when I created it, or the link was broken/not established. Render doesn't always automatically inject the `DATABASE_URL` from a linked DB into the web service environment. Resolution: I manually located the database 'Internal Connection String' from the database service's page in Render and added it as the `DATABASE_URL` environment variable to the Web Service settings. Learning: I learned to verify that the `DATABASE_URL` environment variable exists and is correctly populated in the deployment environment. If using linked services (like Render databases), I need to ensure the link is active and injecting the variable, or manually provide the connection string if necessary.

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