Current Flow Direction Detection Circuit

I'm in need of a circuit that can detect the direction of current flow in a solenoid. This is for a production fixture used in a manufacturing environment. The coil wire colors change frequently, and assemblers place the solenoid in wrong direction sometimes. I want to be able to label the direction of the current flow on the coil.

Specific Requirements:
- The primary application of this circuit is for industrial purposes.
- The circuit needs to be able to detect the current flow direction.
- I prefer using Hall effect sensors for this project, specifically digital output ones.
- I need the freelancer to provide a schematic and Gerber files in Altium for the circuit, along with a bill of materials consisting of common parts to facilitate the circuit build.
- The level of precision required for detecting the current flow direction is basic.

- The solenoid test voltage will 20 VDC

- This solenoid is going to be used in a manufacturing process, so in reality precision isn't really huge. I am just looking to tell an operator which way the current is flowing so that they can mount the solenoid with the hole pointing in the right direction.

- The circuit power supply can be anything you want to set it at. I am thinking that the 20 VDC should only be dedicated to the solenoid coil and the circuitry should have its own power supply of whatever you deem proper.

- I want something visual to tell the operator which way the flow is going. This way they can draw an arrow on the solenoid so that they know how to mount it.


Ideal Skills and Experience:
- Proficient in circuit design and Altium software.
- Experienced in using Hall effect sensors, particularly digital output ones.
- Previous experience in industrial circuit design is preferred.
- Ability to create detailed schematics and Gerber files.