In _getSequelizeConnectionManager, exceptions from this.client.connectionManager access were suppressed and replaced with a generic error message, obscuring the root cause when debugging Sequelize v7+ issues.

Changes

• Capture the original error when accessing this.client.connectionManager throws
• Rethrow the original error directly to preserve full error context
• Add test coverage verifying original error is rethrown

// Before
throw new Error('Sequelize connection manager is not available');

// After
if (originalError) {
  throw originalError;
}
throw new Error('Sequelize connection manager is not available');

This preserves the complete diagnostic context from Sequelize v7+ by rethrowing the original error as-is, making troubleshooting connection manager failures easier while maintaining backward compatibility with older Sequelize versions.

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