doc: add doc comments to EAV trait

01.workspace/heave/src/trt/eav.rs

@@ -1,12 +1,16 @@
 use crate::*;
 
-/// TODO: INSERT DOCUMENTATION HERE
+/// A trait for types that can be represented as an Entity-Attribute-Value model.
-pub trait T where
+///
+/// This trait provides the necessary conversions to and from the generic `Entity`
+/// representation, and it requires the type to define its own class name.
+pub trait T
+where
     Self: From<Entity>,
     Self: Into<Entity>,
 {
+    /// Returns the class name of the type.
+    ///
+    /// This is used to distinguish between different types of entities in the database.
     fn class() -> &'static str;
 }
-
-// #[cfg(test)]
-// mod unit_tests {}