Unbreakable Enchantment

For Fabric
Let me guess, you came here because you accidently broke your OP pickaxe with 1253125123 enchantments on it, so you searched for a mod that would let you fix that.

Well, here you go.

The enchantment is labeled as Indestructible in-game to distinguish from Unbreaking.

This mod on 1.21 and later triggers the Experimental Settings warning every time you open the world. To fix this, install Hide Experimental Warning.