chore: enable keep-alive for database connection

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Name	Status	Preview	Comments	Updated (UTC)
ishortn-ink	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 9, 2024 8:49pm

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PR Summary

• Enhanced Database Connection Configuration This update provides a more robust setup for the database connection. It replaces the uniform resource identifier, 'uri', with a new connection string derived from the environment variable 'DATABASE_URL'. This change allows for more flexible and secure database connections.
• Additional Connection Options The PR introduces two new options to manage the connection better. The 'enableKeepAlive' option ensures the connection stays open, improving speed and communication efficiency with the database. The 'keepAliveInitialDelay' option controls the delay before the first keepalive probe is sent, leading to a more reliable and performance-optimized database connection.