WordPress Developer: Fix "Database Connection" Error

My WordPress site is down, showing "Error establishing a database connection," and won't load at all (including the /wp-admin login page). I need an experienced WordPress developer to diagnose and fix the issue. Likely causes to investigate: corrupted database, incorrect database credentials in wp-config.php, exceeded hosting resource limits, or a plugin conflict affecting the database connection. Scope of work: - Diagnose the root cause of the database connection failure - Repair or reconnect the database as needed - Confirm the site loads normally and fully afterward - Provide a brief explanation of what caused the issue and how it was fixed I'll share WordPress admin and hosting access securely once we agree on scope. Looking for someone who can start soon and has strong experience troubleshooting WordPress database issues.