fix: resolve PostgreSQL connection authentication error

- Fix "no pg_hba.conf entry" error by disabling SSL for Docker network
- Use scram-sha-256 authentication method for better security
- Update knexfile.js to support SSL configuration via environment variable
- Add documentation about PostgreSQL connection requirements

The PostgreSQL container now accepts connections from the Docker network
without requiring SSL, which is appropriate for internal container communication.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

PRODUCTION_DEPLOYMENT_FIXES.md

@@ -81,4 +81,20 @@ Expected response:
 Email service requires configuration in the database. If email is not configured:
 - The service will log a warning but continue running
 - Emails will be queued but not sent
-- Configure email settings in the admin panel after deployment
+- Configure email settings in the admin panel after deployment
+
+## PostgreSQL Connection Fix
+
+### Issue: "no pg_hba.conf entry for host"
+This error occurs when PostgreSQL requires SSL but the client connects without encryption.
+
+### Solution:
+- Disabled SSL requirement for PostgreSQL in Docker environment (`ssl=off`)
+- Added proper authentication method (`scram-sha-256`)
+- This is acceptable for internal Docker networks where all traffic is isolated
+
+### Security Note:
+For production deployments exposed to the internet:
+1. Use SSL certificates for PostgreSQL
+2. Or ensure the database is only accessible within the Docker network
+3. Never expose PostgreSQL port (5432) directly to the internet